Additions to the Aphid fauna of North East India

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. Lachnus titabarensis nov. spec. Apterous viviparous female. — 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