﻿258 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



some broad, large in comparison with sidepiece, simple ; composed of 

 two lateral plates, each with two dorsal projections and a ventral apical 

 spur. Tenth sternite (fig. 33, j) ending in two or three strong teeth, 

 occasionally only one present. Ninth tergite (fig. 33, h) with long, 

 slender lateral lobes expanded at tip, bearing about 16 spines ; four to 

 six spines stronger than others, on dorsal surface; emargination as 

 figured. 



Female. — Very similar to the male except for sexual differences. 

 Proboscis 1.2 of abdomen, 1.3 of front femur. Palpi as in male. Sil- 

 very coloration on abdominal tergite II more extensive, produced 

 mesad apically. 



Pufa (fig. 37, <z, 5). — Cephalothorax (fig. 37, ol) : Dorsal surface, 

 wing covers, lag sheaths darkly pigmented ; rest yellowish. Trumpet 

 darkly pigmented throughout, uniformly reticulate, except for a few 

 ridges at base ; index of length to median width approximately 5 to 1, 

 width more or less uniform ; inner wall well separated from outer in 

 basal half ; opening small, oblique. Hair 1 very long, usually double 

 from base ; 2 usually 2-branched, 3 usually 4-branched, both well de- 

 veloped, conspicuous, about one-third length of 1 ; 4 long, almost one- 

 half of 1, with three or four branches ; 5 shorter, multiple ; 6 very short, 

 double; 7 long, double or triple; 8 double, longer than trumpet; 9 

 shorter, double; 10 short, triple or multiple; 11 long, simple; 12 also 

 long, usually double. 



Abdomen (fig. 37, &) : Darkly pigmented, anterior segments darker ; 

 lateral portions of posterior segments yellowish. First segment : float 

 hair well developed, not flattened at all, branches arising in all direc- 

 tions ; hairs H, L, and U minute ; K, S, and T long, simple ; M multiple, 

 fairly long. Hair B (8) very long and simple on segments II to VII, 

 usually exceeding the distal margin of following segment. Hair C 

 (10) much shorter, multiple, reduced in size on terminal segments; C 

 short, simple, placed approximately one-fourth to one-third from dis- 

 tal margin of segments, well mesad of C. Hair A very minute, placed 

 laterally at about level of C on segments II to VI ; on segments VII 

 and VIII a large fan-shaped tuft with barbed branches, that of VIII 

 extending beyond apex of paddles. A' on segment VIII long, extend- 

 ing more than half length of paddles. Hair 2 on segment I, extremely 

 long, much longer than B, inserted at about middle of segment. Pad- 

 dle short, without marginal fringe or apical hair ; midrib sclerotized 

 except at apex ; outer portion extended and rounded before the midrib ; 

 inner portion very narrow, less than third of portion laterad of midrib. 



Male genitalia: Genital lobes about half as long as the paddles, 

 narrowed at apex to one-half the width at base, lateral margins 

 straight, apex rounded; anal lobe (segment IX) rounded at apex, 

 about three-fourths as long as genital lobes. 



