14 E. B. Williamson and J. II. Willla.mson 



at or near the ninth postnodal (66.7% males, 50% females) ; in the hind 

 wing at or near the sixth postnodal (16.7% males), at or near the seventh 

 postnodal (16.7% males, 75% females), or at or near the eighth postnodal 

 (66.7% males, 25% females). 



Mja in front wing arising three cells before the stigma (83.3% males, 

 75% females), four cells before the stigma (16.7% males, 12.5% females), 

 or five cells before the stigma (12.5% females) ; in the hind wing two 

 cells before the stigma (50% males), three cells before the stigma (50% 

 males, 62.5% females), or four cells before the stigma (37.5% females). 



Number of cells posterior to CUg in front wing, 13 (16.7% males), 14 

 (33.3% males, 12.5% females), 15 (50% males, 75% females), or 16 

 (12.5% males); in hind wing, 11 (16.7% males), 12 (50% males, 12.5% 

 females), 13 (16.7% males, 37.5% females), 14 (25% females), 15 (16.7% 

 males), or 16 (25% females). 



jMaterial examined : Frencli Guiana, Pied Saut, Oyapok River, November, 

 1917, S. M. Klages, Cam. Mus. Ace. 6111, 1 male, 3 females, the male the 

 type and one female the allotype; Tamanoir, Mana River, June, 1917, 

 S. M. Klages, Carn. Mus., 1 male; St. Laurent du Maroni, coll. K. J. Mor- 

 ton, 1 male, 1 female. 



None of the above material is perfect and all appear somewhat teneral 

 or discolored. It is therefore probable that the color description will be 

 found to be inaccurate for mature and well preserved or freshly killed 

 specimens. At the same time the structures are well enough preserved in 

 the material available for this paper and there should be no trouble in the 

 future in recognizing the species. 



Hagen describes fragilis from two females, a larger from Congonhas, 

 Brazil, and a smaller from the Essequibo, British Guiana. The larger 

 Brazilian specimen evidently served largely, if not entirely, as the basis 

 of both the generic and specific descriptions. His generic description 

 will apply probably only to Group II, as defined in the synoptic key in 

 this paper. Our material from the Guianas is very incomplete, but there 

 is no reason to think Hagen 's two females are conspecific and it seems 

 better to retain the name fragilis for the southern Brazilian species to 

 which Hagen 's description better applies, and which is therefore the type 

 of the genus, and to give a new name to the only species certainly known 

 from the Guianas. This species, guiane7isis, -helongs to our Group I, and 

 its nearest relative is probably magdalenae from the lower Magdalena in 

 Colombia. 



3. Perilestes remotus, new species 



Abdomen male 50-54, female 41.5-43.5; hind wing male 23.5-25.5, fe- 

 male 25-26; stigma front wing male 1.05-1.10, female 1.10-1.30; stigma 

 hind wing male 1.20-1.30, female 1.27-1.40; abdominal appendage male 

 1.40, female .40-46; male anterior lamina from apex of sternum of seg- 

 ment 1 to apex of the posterior process 1.8-2.0 ; female valve 3.0. 



Male. — Labium pale, apices of median lobe, end hook and movable hook 



