The Genus Perilestes 23 



hind wing at the sixth postnodal (37.5% males), at the seventh postnodal 

 (62.5% males, 83.3% females), or at the eighth postnodal (16.7% females). 



M2 in front wing arising at or near the eighth postnodal (62.5% males, 

 16.7% females), or at or near the ninth postnodal (37.5% males, 83.3% 

 females) ; in the hind wing at or near the seventh postnodal (37.5% males), 

 at or near the eighth postnodal (50% males, 83.3% females), or at or near 

 the ninth postnodal (12.5% males, 16.7% females). 



M^a in front wing arising at the distal end of the stigma (100% males, 

 83.3% females), or at the proximal end of the stigma (16.7% females) ; in 

 the hind wing at the distal end of the stigma (100% males, 100% females). 



Number of cells posterior to Cug in the front wing, 7 (12.5% males, 16.7% 

 females), 8 (16.7% females), 9 (37.5% males), 10 (25% males), 11 (25% 

 males, 16.7% females), or 12 (50% females) ; in hind wing, 3 (16.7% fe- 

 males), 4 (37.5% males, 16.7% females), 5 (62.5% males, 33.3% females), 

 or 6 (33.3% females). 



The following color notes were made from a male and female taken at 

 Abuna, March 20. Male. — Eyes dull green above, slightly lighter below. 

 Top of head metallic green with purplish reflections. Back of head metal- 

 lic grays and browns. Prothorax brown and transparent light color. Nar- 

 row middorsal stripe light gray, bordered with black, in turn bordered 

 with brown with metallic green reflections; a pearl colored antehumeral 

 stripe ; mesepimeron brown ; posteriorly almost white with a brown stripe 

 on the second lateral suture ; very light below. Legs white with black 

 markings. Abdomen black, brown and white, 7 and 8 with areas of pale 

 blue. Female. — Similar, thoracic colors the same but paler; blue areas on 

 abdominal segments 7 and 8 paler. 



Material examined : Bolivia, Cashuela Esperanza, April 13, 1922, 1 male ; 

 Brazil, Abuna, Matto Grosso, March 16, 20 and 21, 1922, 4 males, 1 female; 

 Porto Velho, Amazonas, May 2, 7, 18, 19, 23, and 24, 1922, 17 males, 2 

 females ; Manaos, Amazonas, June 18, 1922, 2 males. 



The reasons for assigning De Selys' name to the above species are as 

 follows : 1. His description agrees well, except that the female described 

 by him has the abdomen longer than any of the few females we have seen. 

 (It must not be overlooked that De Selys' description is largely compara- 

 tive with cornutus, though he speaks of it as fragilis.) 2. Our specimens 

 are from widely scattered localities and there is no reason why the species 

 should not be expected to occur at Santarem, the type locality. 3. More- 

 over, attenuatus seems to be rather adaptable for a Perilestes as it occurs 

 on sandy bottom creeks and on creeks with mud bottoms and banks, so 

 there is this further reason for expecting to find it at Santarem. 



Attenuatus was the only species of Perilestes taken at Abuna, where it 

 was found in woods along the creek at Km. 216. The first male seen was 

 hanging with folded wings from the tip of a leaf eight feet above the 

 ground ; the second was flying in the woods a few inches from the ground. 

 Likewise it was the onlj^ species taken at Cashuela Esperanza, where a 

 single male was taken on a creek where two species of Heteragrion were 

 common. At Porto Velho while cornutus was found only on the charcoal 



