30 E. B. Williamson and J. H. Williamson 



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

 the eighth postnodal (83.3% males, 100% females). 



M^a in front wing arising at the proximal end of the stigma (83.3% 

 males), or one cell proximal to the stigma (16.7% males, 100% females), 

 in the hind wing at the distal end of the stigma (33.3% males), or at the 

 proximal end of the stigma (66.7% males, 100% females). 



Number of cells, posterior to CUs in front wing, 10 (50% females), 11 

 (16.7% males), 12 (33.3% males), 'l4 (50% females), 15 (33.3% males), 

 or 16 (16.7% males) ; in hind wing, 6 (16.7% males), 8 (16.7% males, 100% 

 females), 9 (16.7% males), 10 (16.7% males), 11 (16.7% males), or 12 

 (16.7% males). 



Material examined : Brazil, Rio de Janeiro, Alto Boa Vista Creek, below 

 Alto Boa Vista, September 6 and 8, 1922, 3 males ; Cascatinha Falls Creek, 

 above Alto Boa Vista, September 14, 1922, 1 female. 



The larger of Hagen's two female types of fragilis was taken at Con- 

 gonhas, Brazil, a town about 250 miles north and a little west of Rio de 

 Janeiro, and on the headwaters of the Rio San Francisco. This larger 

 female type rather than the smaller female from the Essequibo in British 

 Guiana, is the basis for Hagen's generic and specific description. The 

 description agrees well with the Rio female, and unless later collecting 

 should reveal more than one species in the locality, the determination of 

 the Rio specimens as fragilis may be considered certainly correct. Because 

 of the wide separation of the locality from the Amazonian basin, it is im- 

 probable that more than one species will be found near Rio in the future. 



8. Perilestes solutus, new species 



Abdomen male 42-46, female 38-40 ; hind wing male 20-21. female 21-24 ; 

 stigma front wing male 1.13-1.20, female 1.27-1.33; stigma hind; wing 

 male 1.12-1.20, female 1.27-1.30 ; abdominal appendage male 1.20-1.35, 

 female .40 ; male anterior lamina from apex of sternum of segment 1 to 

 apex of the posterior process 1.35-1.45; female valve 1.85-2.0. 



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

 shaded darker; labrum, anteclypeus and the postclypeus narrowly in front 

 and with or without a deep median rectangular indentation, bright blue, 

 the labrum narrowly black margined in front. 



Prothorax pale, darker shaded above especially on the middle and hind 

 lobes, the proepimeron largely light brown ; hind border semicircular. 



Thorax black above with greenish reflections, the dark occupying about 

 half or more of the mesepisternum, the middorsal carina narrowly brown ; 

 outer half or less of mesepisternum, except the extreme upper part which 

 is black, pale brown or dark flesh with traces of bluish or yellowish; this 

 pale color may fade out to a maximum along the humeral suture or there 

 may be a well-defined narrow pale antehumeral stripe; mesepimeron red- 

 dish brown, a long black spot above on the humeral suture and another 

 shorter one above and posterior to it, with a pale (yellow?) area between 

 them ; the broad band of color of the mesepimeron carried across the mesin- 



