The Genus Perilestes 25 



area is wanting, being occupied by the brown area which is postbasal on 

 the second femur. Tibiae distinctly paler than the femora, very light yel- 

 low, dark brown at base, marked as in fragilis. 



Venation and stigma as in soluUis. 



Abdomen seen from above : 1 pale, only slightly darker above, the extreme 

 apex brown, passing to black below; 2 black or brown, in the latter case 

 pale at the base and passing into black at the extreme apex, in which case 

 the brown is so pale basally that the median longitudinal pale area is iU 

 defined in the dried specimen ; 3-7 similar to those of fragilis, but slightly 

 darker in the dark areas on the anterior segments and progressively more 

 so on the posterior segments, so 7 is black with a pale basal ring; 8 black 

 with the basal fourth or third pale (blue?), in the type specimen the black 

 encroaching on the pale area in the median line with a triangular projec- 

 tion ; 9 and 10 black. Seen from the side : 1-7 similar to those of fragilis, 

 but differing as follows : on 2 the dorsal dark does not extend quite so far 

 on the side on kaJili and the line of separation of the dark and pale is a 

 straight line, not a dorsally convex line as in fragilis; segments 3-7 have 

 the dark areas darker in color in kahli, on the posterior segments becoming 

 black rather than brown, and they differ strikingly from fragilis in having 

 the ventral margins more extensively pale, due to a complete or more nearly 

 complete joining along the ventral margin of the pale basal area and the 

 anteapical pale area, on 3 this joining is complete, on 4 there is a slight 

 brief shading of brown just before the anteapical pale area, on 5 this brown 

 is darker and more extensive, on 6 the dorsal black reaches the ventral 

 margin along about the middle half of the segment and is thus nearly as 

 extensive as in fragilis ; 7 entirely black, excepting the lateral extension of 

 the pale basal ring; 8 with the pale basal spot narrowing posteriorly but 

 reaching the apex along the ventral margin ; 9 all black with the merest 

 streak of pale on the ventral margin ; 10 with the ventral half pale. Ster- 

 num of 1 pale ; 3 dark, narrowed at the base, and interrupted at the ante- 

 apical pale area ; 4 dark to black, pale at base and at the anteapical pale 

 area; 5 black, pale at base with a brown spot, and pale at the anteapical 

 pale area ; 6 similar to that of 5 but the basal brown spot larger and darker ; 

 7 black, very briefly pale at base and apex ; 8-10 bright light blue. Appen- 

 dages black. 



Length of wing or lobe on the expanded postero-ventral margin of the 

 tergum of 2 about .8, and the distance from the apex of this lobe to the 

 antero-ventral angle of the tergum about 1.7. 



Female. — Labium as in the male ; labrum black, a large dull yellow median 

 geminate spot at the base; clypeus in front dull yellow, a vertical brown 

 bar on either side equally distant from the median line and) the lateral 

 margin; clypeus above black. 



Prothorax similar to that of the male but darker above, a round dark 

 brown median spot on the front lobe, and the dorsum of the middle and 

 hind lobes, excepting the elevated hind border of the latter, dark brown 

 to black ; hind border similar to that of the male but slightly more elevated. 



Thorax above with the dorsal black occupying one-half to two-thirds of 



