ALBERT

Description: A survey is given of the assassin bugs (Reduviidae) collected on the six Netherlands Antilles. All together 22 species were sampled: 6 Emesinae, 1 Saicinae, 8 Harpactorinae, 1 Piratinae, 4 Stenopodinae, 1 Triatominae and 1 Phymatinae. Sixteen species were captured on the three islands of the Leeward Group, Aruba, Curaçao and Bonaire; seven species were found on the three islands of the Windward Group, St. Eustatius, Saba and St. Martin; both groups of islands have only 1 species in common. The local distribution of the species represented (Table 1) does not fit with their known gross distribution in the neotropics. Curaçao harbours more than 70% of the total number of species; zoogeographical aspects have been discussed. Two species are described as new; Cosmoclopius curacavensis (Harpactorinae), living on Curaçao as a predator exclusively on the weed Cleome viscosa, and Oncerotrachelus sabensis (Saicinae) from Saba. The identity of some Emesinae and the single phimatine specimen captured remain unsettled for the present. Triatoma maculata. vector of a T. cruzi strain with low virulence, occurs in two colour forms; the dark one restricted to Aruba, the light-coloured form to Curaçao and Bonaire. Total drawings of most species are presented in addition to some 120 figures of structural details of eggs, larvae and adults. Features of eggs and genitalia are discussed on pages 17-28. Some points of general interest are: The egg of Sinea coronata appeared to be quite different from what is known from other Sinea spp. Eggs of Piratinae have movable slips with plastron function. The harpactorines Atrachelus fuscus and Sinea coronata lack parameres. Behavioural aspects concerned with utilizing sticky material have been summarized. Evidence is presented that the subrectal gland, occurring in many Harpactorinae, secretes the colleterial liquid for the egg-batch. The asymmetrical genitalia of the Piratinae and the endosomal brush zone and basal differentiation of the ductus ejaculatorius in some Stenopodinae are stressed.

Description: The several Dipsocoridae reported from the Caribbean islands include three species of Cryptostemma: smithi McAtee & Malloch, 1925 (Grenada), uhleri McAtee & Malloch, 1925 (St. Vincent), and pratti Usinger, 1945 (Puerto Rico). In the present paper an additional Caribbean Cryptostemma is described, cobbeni sp. n. (Bonaire). I am grateful to Ir. R. H. COBBEN, of the Landbouwhogeschool at Wageningen, for the opportunity of investigating the interesting material collected by him.

Description: The present study is based on material obtained by Dr. P. WAGENAAR HUMMELINCK on his various trips to the Caribbean, the greater part of which was received from the Zoölogisch Museum at Amsterdam, where the types and most of the other specimens are deposited. Mr. R. H. COBBEN, entomologist of the Landbouwhogeschool at Wageningen, who collected on the Netherlands Antilles in 1956, was also kind enough to let me have his material for study. The following species are now known to occur in the area under consideration:

Description: The several Dipsocoridae reported from the Caribbean islands include three species of Cryptostemma: smithi McAtee & Malloch, 1925 (Grenada), uhleri McAtee & Malloch, 1925 (St. Vincent), and pratti Usinger, 1945 (Puerto Rico). In the present paper an additional Caribbean Cryptostemma is described, cobbeni sp. n. (Bonaire).\nI am grateful to Ir. R. H. COBBEN, of the Landbouwhogeschool at Wageningen, for the opportunity of investigating the interesting material collected by him.

Description: A survey is given of the assassin bugs (Reduviidae) collected on the six Netherlands Antilles. All together 22 species were sampled: 6 Emesinae, 1 Saicinae, 8 Harpactorinae, 1 Piratinae, 4 Stenopodinae, 1 Triatominae and 1 Phymatinae.\nSixteen species were captured on the three islands of the Leeward Group, Aruba, Cura\xc3\xa7ao and Bonaire; seven species were found on the three islands of the Windward Group, St. Eustatius, Saba and St. Martin; both groups of islands have only 1 species in common. The local distribution of the species represented (Table 1) does not fit with their known gross distribution in the neotropics. Cura\xc3\xa7ao harbours more than 70% of the total number of species; zoogeographical aspects have been discussed. Two species are described as new; Cosmoclopius curacavensis (Harpactorinae), living on Cura\xc3\xa7ao as a predator exclusively on the weed Cleome viscosa, and Oncerotrachelus sabensis (Saicinae) from Saba. The identity of some Emesinae and the single phimatine specimen captured remain unsettled for the present. Triatoma maculata. vector of a T. cruzi strain with low virulence, occurs in two colour forms; the dark one restricted to Aruba, the light-coloured form to Cura\xc3\xa7ao and Bonaire. Total drawings of most species are presented in addition to some 120 figures of structural details of eggs, larvae and adults. Features of eggs and genitalia are discussed on pages 17-28.\nSome points of general interest are: The egg of Sinea coronata appeared to be quite different from what is known from other Sinea spp. Eggs of Piratinae have movable slips with plastron function. The harpactorines Atrachelus fuscus and Sinea coronata lack parameres. Behavioural aspects concerned with utilizing sticky material have been summarized. Evidence is presented that the subrectal gland, occurring in many Harpactorinae, secretes the colleterial liquid for the egg-batch. The asymmetrical genitalia of the Piratinae and the endosomal brush zone and basal differentiation of the ductus ejaculatorius in some Stenopodinae are stressed.

Description: The present study is based on material obtained by Dr. P. WAGENAAR HUMMELINCK on his various trips to the Caribbean, the greater part of which was received from the Zo\xc3\xb6logisch Museum at Amsterdam, where the types and most of the other specimens are deposited. Mr. R. H. COBBEN, entomologist of the Landbouwhogeschool at Wageningen, who collected on the Netherlands Antilles in 1956, was also kind enough to let me have his material for study.\nThe following species are now known to occur in the area under consideration:

Description: The present paper constitutes a report on the Machilidae and Lepismatidae collected by Dr. C. O. van Regteren Altena in the Canary Islands in the spring of 1947. We are much obliged to Dr. van Regteren Altena for allowing us to study these interesting specimens.\nThe first notice on Thysanura from the Canary Islands seems to be the mentioning of Machilis maritima by Lucas (1836-44). Unfortunately it is quite impossible nowadays to identify that species as understood by Lucas.\nRidley (1881) mentions three species from the Canary Islands, viz., Lepisma saccharina L., from Tenerife and Gran Canaria; Lepisma mauritanica Lucas, from Las Palmas (Gran Canaria) and Lepisma eatonii Ridley, from Tenerife. L. saccharina has apparently not been found again on the Islands; anyhow we do not see any reason to doubt its presence there. Lepisma mauritanica, actually included in the genus Ctenolepisma, is a species that is rare as well as very difficult to identify; Ridley\'s specimens were most probably nothing else but dark Ctenolepisma lineata, a species common in the Islands. Finally Lepisma eatonii, whose correct name should be Ctenolepisma lineata eatonii, is nothing more than a colour form of Ctenolepisma lineata, which may not deserve even subspecific rank.\nEscherich (1905) also mentions Ctenolepisma lineata eatonii from Tenerife.\nSilvestri (1940) gives the first record for Lepisma myrmecobia Silvestri from the Islands (Gran Canaria and Tenerife).\nWygodzinsky (1941) described Dilta insulicola from Tenerife.\nIn the present paper an additional species of Dilta, Dilta altenai sp. n. is described from Tenerife, and several of the formerly known species of