ALBERT

Description: In the course of the year 1954 I received for identification a little Nematoceron belonging to the family Lycoriidae (Sciaridae). After a careful examination of the material and the literature I arrived at the conclusion that my specimens represented a hitherto undescribed species. It belongs to the genus Neosciara Pettey, 1918 (sensu Lengersdorf, 1930 and Frey, 1942).\nThere is some confusion about the naming and delimitation of the genera in the subfamily Lycoriinae. The four most important opinions are : I. Lengersdorf (1930) : Genus Lycoria Meigen, 1800, syn. Saara Meigen, 1803, Gruppe I (no name, veins cu and m with bristles) and Gruppe\nII\nNeosciara Pettey, 1918 (cu and m bare).\nII. S\xc3\xa9guy (1940) : Genus Lycoria Meigen, 1800 (cu and m with bristles) and S ciara Meigen, 1803 (veins cu and m bare).\nIII. Frey (1942) : Genus Sciara Meigen, 1803, syn. Lycoria Meigen, 1800 (cu and m with bristles) and genus Neosciara Pettey, 1918 (cu and m without bristles).\nIV. Frey (1948): Genus Sciara Meigen, 1803 (cu and m with bristles) and genus Bradysia Winnertz, 1867, containing the subgenus Neosciara Pettey, 1918.\nThe character concerning the bristles on the veins cu and m is very important for distinguishing these genera. When summarizing the above opinions we find that the species with bristles on cu and m have been named Lycoria Meigen, 1800 = Sciara Meigen, 1803 (Lengersdorf, 1930) ; Lycoria Meigen, 1800 (S\xc3\xa9guy, 1940) ; Sciara Meigen, 1803 = Lycoria Meigen, 1800 (Frey, 1942, 1948). The species lacking setae on the veins cu and m have been named Neosciara Pettey, 1918 (Lengersdorf, 1930, Frey, 1942) ; Sciara

Description: During a short stay at Bangkok on December 3rd, 1953, Professor H.\nBoschma observed that enormous quantities of minute insects were attracted by lamplight in the hotel of the Royal Dutch Airlines (K.L.M.) "Plaswijk" at the airport Laksi. From the enormous accumulations of these insects around the lamps he collected a sample which he entrusted to me for examination. This sample proved to consist almost entirely of a new species of mayfly which is described in the present paper.\nCaenis demoulini nov. spec.\nFemale imago.\nHead and thorax uniformly yellowish brown. Eyes purple-black, prominent.\nAntennae grey-brown ; median ocellus prominent, colour light brown with a darker edge.\nAbdomen pale yellowish brown, at the dorsal surface with light browngrey markings, except on the last three tergites. Ventral surface paler, especially the last three segments. Stigmata in or near a faint black or grey spot. Cerci and filum terminale silver-white, rather densely covered with stiff, long, silvery hairs, except at the base of these caudal filaments, where the colour passes into a very light brown, whilst here the hairs abruptly become much shorter, and are placed more densely.\nAnterior legs grey-brown, median and posterior legs pure white with a very faint yellowish spot at the end of the femora.\nWings vitreous, veins light grey, except subcosta and radius, which are dark grey-brown. Area subcostalis very light ferruginous.\nMeasurements: body Q 3.5 mm wing \xc3\x87 2.9-3.0 mm