ALBERT

Description: Since 1896, about seventy-two species of aphids have been described from this part of India by different workers. The species so far described are distributed over about forty-two genera. The present paper brings the number of species to seventy-four and that of the genera to forty-three.\nLachnus titabarensis nov. spec.\nApterous viviparous female. \xe2\x80\x94 Body pyriform, about 2.4 to 2.6 mm long, with about 1.3 to 1.5 mm as maximum width. Abdominal tergites brownish, wrinkled, with a row of small pleural patches on either side; base of siphunculus surrounded by a large brownish patch. Hairs on the dorsum of the abdomen on small circular sclerites (mostly broken), stout; most of the hairs with long acute apices, a few with acuminate apices; the shorter ones caudad, a very few of such hairs with deeply furcated apices (fig. 1); the longest of the entire hairs may be up to 22/3 times as long as the basal diameter of segment III, the shortest furcated hair is up to about 11/4 times as long as the diameter mentioned. Dorsal hairs on the head rather fine, and with acute apices. The antennae are slightly lighter in colour than the head, which is dark brown, excepting the basal 2/3 of segment III, which is still lighter; segment III smooth basad, the rest of the flagellum gradually more distinctly imbricated from base to apex; segment III up to about 7/12 the length of segments IV, V, and VI taken together; segments IV and V subequal; processus terminalis slightly less than half the length of the base of the segment (5/11); hairs on segment III with finely drawn apices, up to about 2 to 22/3 times as long as the basal diameter of the segment. The apex of the rostrum bluntish, reaching a little beyond the second coxae; segments 4 + 5 up to about 7/8 the length of the second segment of the

Description: The present paper contains the results of studies on the tribe Greenideini of the subfamily Greenideinae Takahashi, 1931, a primitive group of Aphididae mainly restricted to East Asia. Material could be studied of twentyseven species described by previous authors, while seven species had to be described as new. Some changes had to be effected in the systematic arrangement, so that at present six genera (old and new) are recognised in the group, together including five subgenera. In spite of repeated attempts not all the species so far described could be examined, accordingly in a final chapter notes are added on the species that were not available.\nThe project for carrying out research work on Aphididae could be realised through the kind help of Mr. D. Hille Ris Lambers at Bennekom, who not only selected a suitable subject for these studies (the genus Greenidia and its allies), but also placed the valuable material from his private collections at my disposal together with the literature of the group from his library, and, moreover, arranged for the loan of specimens from other institutions.\nAfter having discussed at Bennekom the plans for the investigations, the work was carried out in the Rijksmuseum van Natuurlijke Historie at Leiden, whilst the results were supervised by Mr. Hille Ris Lambers during my repeated visits to Bennekom; I am greatly indebted to him for assiduous guidance and for hospitality received at his home.\nIn the Rijksmuseum van Natuurlijke Historie help and encouragement was received from Professor H. Boschma in various ways, while manyfold help was obtained from Dr. L. B. Holthuis, curator of Crustacea. Thanks are due to Dr. W. Vervoort, Zoological Laboratory, Leiden, for the micro-