Mosquito Syslematics, 27(3):191-196, 1995 Copyright (C) 1995 by American Mosquito Control Association, DESCRIPTION OF THE LARVA AND PUPA OF AEDES (AEDIMORPHUS) NIGROSTRIATUS (DIPTERA: CULICIDAE) D. R. BHATTACHARYYA,’ S. C. TEWARI,2 P. DUTTA’ AND J. MAHANTA’ ABSTRACT. The fourth-instar larva and pupa of Aedes (Aedimorphus) nigrostriatus (Barraud) described and illustrated for the first time. INTRODUCTION The male and female of Aedes (Aedimor- phus) nigrostriatus (Barraud, 1927) originally described from Golaghat, Assam, India, and subsequently redescribed by Bar- raud (1934) and Reinert (1973), the latter while reviewing the submenus Aedimorphus Theobald in Southeast Asia. However, its lar- val and pupal stages remained undescribed. We reared the immatures of Ae. nigrostriatus in the laboratory by obtaining eggs from wild-caught females captured in Kakati Goan, Dibrugarh, Assam, India. The descrip- tions of the fourth-instar larva and pupa presented here with illustrations. MATERIALS AND METHODS A total of 400 eggs laid by 20 fully fed wild-caught females of Ac. nigrostriatus individually reared. Considerable tality occurred during rearing and only 24 adult progeny obtained. Identification of species confirmed by examining the male genitalia. Nomenclature and chaetotaxy follow Harbach and Knight (1980, 1982). In descriptions of the immatures, the range of setal branching is followed by the mode in parentheses. Regional Medical Research Centre, N.E. Region, Post No. 105, Dibrugarh 786 001 (Assam), India. Centre for Research in Medical Entomology, Post 11, No. Sarojini Street, Chinna Chokkikulam, Madurai-625002, India. TAXONOMIC TREATMENT Aedes (Aedimorphus) nigrostriatus (Barraud) Larva (Fig. 1). Chaetotaxy figured and recorded in Table (n 50). Head: Mod- erately pigmented; seta 4-C with 5,6 fine branches, anterior to 5,6-C; 5-C barbed, with 5-8(7) branches; 6-C barbed, with 5-7(6) branches; 7-C barbed, with 10-13(10) branches; 5-7-C in diagonal line; 6-Mx sin- gle; dorsomentum with 10,11 teeth either side of median tooth. Antenna: Moderately long, 0.47-0.57 (mean 0.50) length of head, spiculate, especially basally; seta 1-A barbed, with 5-9(6) branches, inserted about 0.46 length of shaft; 2-6-A single, inserted at apex. Thorax: Setae 1,10,12-P sin- gle; 5-8-P, 5-10,12-M and 7,9,10-T barbed. Abdomen: Setae 6,7-1,11 barbed; 6-III,IV ally bifid, weakly barbed; 10-III,IV long, about 0.5 length of following segments; 6- V,VI single, weakly barbed; 1-VIII barbed, with 6-9(7) branches; 3-VIII barbed, with 10-13(11) branches; 5-VIII barbed, with 5- 7(7) branches; segment VIII with 18-30(21) comb scales arranged in 3 irregular rows, each scale with short, fine, and stout denti- cles along lateral and apical margins; 1-X short, single, rarely double; 2-X with 5-9(7) subequal branches; 3-X long, single; 4-X composed of 8 long setae grid and 4 short precratal setae, all with multiple branches. Saddle: Moderately pigmented; anal papillae 2 unequal pairs, long, tapered, 2.22-2.80 length of saddle. Siphon: Pigmentation uni- form, moderate; well developed; index