The Genus Perilestes 21 



its length, and again widened or not at its apical end; on either side a 

 longitudinal black bar just inside the latero-ventral carina, reaching pos- 

 teriorly nearly to the apex of the metasternum,- anteriorly it reaches a 

 greater length, measured from the level of the angle of the latero-ventral 

 carina, than its length posterior to that point, sometimes with a greater 

 or lesser interruption nearly reaching the anterior suture which bounds 

 the metasternum. Mesostigmal lamina low and of nearly uniform heighth 

 throughout. 



Coxae pale, the second and third each with the anterior face broadly 

 black. Legs pale, of all the species the most distinctly marked with darker 

 though the general pattern is similar to that of kahli; second and third 

 femora dark at base and all femora dark at apex, between base and apex 

 each femur with two encircling bands of brown to black, these dark areas 

 more extensive than the pale areas adjoining them ; tibiae paler and clearer 

 than femora, each dark at base, a narrow line of black on the ventral sur- 

 face, widest on the first tibia. 



Venation like that of solutus; stigma dark brown or black. 



Abdomen seen from above : similar to that of kahli, 7 brown rather than 

 black, and the dark colors on the preceding segments are slightly paler in 

 attenuatus ; 8-10 brown, darker to black on the base of 9 and the apex of 

 10, a pale ring occupying the basal fifth of 8. Seen from the side similar 

 to that of kahli, except that the dark color, adjoining the pale ventral margin 

 of each of segments 3-6 is paler and duller, so the ventral margin is less 

 contrastingly colored but the dark color is more extensively extended from 

 the dorsum to the ventral margin so the pale basal and pale anteapical 

 areas of each segment are more widely separated in attenuatus than in 

 kahli; on 8 only the extreme ventral margin is pale, this widened slightly 

 and briefly just before it passes into the pale basal ring. Sternum of 1 pale ; 

 3 pale at base, passing insensibly into very pale brown which fades quickly 

 into pale at the anteapical pale area, then passing posteriorly into more 

 or less distinct blue and then brown; 4-6 similar to 3, the dark (brown) 

 progressively darker from the anterior to the posterior segments, and the 

 faint blue, sometimes following the anteapical pale area on 3, growing 

 fainter and disappearing on 5 or 6 ; 7 dark brown or black, restricted pale 

 (blue?) at base and apex; 8-10 bright light blue. Appendages black. 



Length of the 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 yellowish 

 rounded basal spot on either side, these spots very narrowly or scarcely 

 separated in the median line; clypeus patterned as in kahli but the pale 

 color on the front is a dull leaden blue or obscure. 



Prothorax similar in color and shape to that of the male. 



Thorax above like that of the male except that the black adjoining the 

 middorsal carina is only about half as wide as in the male; side of thorax 

 similar to that of the male except that the dark colors are slightly paler, 

 the dark stripe on the second lateral suture is not or very slightly widened 



