The Genus Perilestes 9 



usually largely dark colored. Adult male with metasternum and femora 

 largely or entirely black (except in guianensis as shown by scanty material). 

 Adult male with sterna of 9-10 yellowish or blue (except cornutus which has 



sterna of 8-10 yellow or blue) Group 1. Males 2. Females 5. 



V. M ^ arising usually at the level of the proximal end of stigma or more 

 distad. Abdominal segments 3-6 each with a pale basal ring, the dark area 

 following it continuous with the dark median area. Face dissimilar in the 

 two sexes, in the male sharply patterned black and bright pale blue, in the 

 female less distinctly patterned, no bright blue, duller, the black or dull 

 labrum with pale basal areas or darker edged. Male superior appendage 

 without a basal dilatation, or, if present, with it ending on the inner border 

 in a tongue-like plate with a rounded apex. Blade of the second hamule 

 wider, very broadly spoon-shaped or angled in cross-section, the flat or ex- 

 ternal surface transverse to the long axis of the abdomen; anterior lamina 

 shorter (less than 1.5), largely pale colored. Adult male with metasternum 

 and femora not largely or entirely black. Adult male with sterna of 8-10 

 bright blue (or possibly bright yellow in fragilis) Group II. 8. 



2 (1). Stigma reddish brown; spine of superior appendage small, placed slightly 



distad to midlength of the appendage and directed caudo-ventrad cornutus 



2'. Stigma black 3. 



3 (2'). Metasternum and femora largely pale; spine of superior appendage large, 



placed at about midlength of the appendage, directed ventrad and only 



slightly caudad guianensis 



3'. Metasternum and femora largely black 4. 



4 (3'). Anal plate a small but conspicuous cordate tuJjercle projecting beyond the 



apex of segment 10 in dorsal view; spine on superior appendage basal to mid- 

 length of the appendage and directed caudad remotus 



4'. Anal plate inconspicuous, a small rounded tubercle concealed within the 

 apex of segment 10 in dorsal view; spine on superior appendage distal to 

 midlength of appendage and directed more ventrad than caudad magdalenae 



5 (1). Hind lobe of prothorax bearing an erect median spine 6. 



5'. Hind lobe of prothorax not spined; stigma black 7. 



6 ( 5 ) . Stigma reddish brown cornutus 



6'. Stigma black; point of attachment of valvular styles under the abdominal 



appendages magdalenae 



7 (5'). Point of attachment of valvular styles under the abdominal appen- 



dages guianensis. 



1'. Point of attachment of valvular styles distal to the level of the apices of 

 the abdominal appendages remotus 



8 (1')- Six or fewer cells behind Cu in the hind wing; stig-ma black or brown (but 



not reddish brown). Male appendage without spine or plate in the basal 

 half, distal to midlength a biparted spoon-like dilatation on the inner edge, 

 about equal in length to the narrowed apex; male labrum and anteclypeus 

 bright light blue, almost white, the former black-bordered in front, postclj'peus 

 shining greenish black. Female with point of attachment of valvular styles 

 about the level of the apices of the abdominal appendages; hind border of 

 the prothorax straightened, nearly horizontal, dropping off at either end with 

 a nearly vertical lateral margin; mesostigmal lamina low, of uniform 



heighth attenuatus 



8'. More than six cells behind Cu^ in the hind wing 



Males 9. Females 12 (female of minor not known). 



