16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



Wings subh3'aline; fourth vein with rounded bend and thence 

 straight to costa well before apex. 



Length, 7 mm. 



Described from two males from Perales, Chile, September 23, col- 

 lected by Father Anastase Pirion. The place is Quilpue, about 

 30 kilometers from Valparaiso. These were transmitted by Alfredo 

 Faz of Santiago. 



One additional male, collected by Father Pirion, at the same 

 place and on the same day, is larger (8.3 mm.) and has on the 

 middle of the small crossvein in each wing a very large semierect 

 spine, about as long as the hind crossvein. At first I supposed this 

 would be a generic character, but the receipt of additional mate- 

 rial lacking it and agreeing in other respects compels me to believe 

 provisionally that this is a remarkable abnormality of the single 

 specimen. 



A female w-as collected by Edwards at L. Corrientes, Rio Negro 

 Territory, Argentina ; it is in the British Museum. 



Type.— C^t. No. 28875, U.S.N.M. 



INCAMYIA STRIATA, new species 



Male. — Slightly smaller than /. spinicosta, differing by the char- 

 acters mentioned in the key. The median poUinose stripe extends 

 very distinctly in its full width to the tip of the scutellum; the 

 basal white pollinose crossbands of the abdomen are very well de- 

 fined and the segments are polished for the greater part of their 

 length. The crossbands end abruptly just under the margin of the 

 abdomen leaving most of the venter shining, or with very slight 

 even pruinosity. Genitalia small, not spread. The apical cross- 

 vein not quite so oblique as in the other species, joining the third 

 vein so as to leave a well defined petiole about as long as the anterior 

 crossvein. 



Length, male, 5 and 5.4 mm. 



Described from two male specimens collected by C. H. T. Town- 

 send at Oroyo, Peru, May 7 and 28, 1914. 



Type.— Male, Cat. No. 40835 U.S.N.M. 



INCAMYIA CHILENSIS, new species 



Male. — Greatly resembles /. spinicosta in all respects, but differs 

 in the characters mentioned in the key. When viewed directly 

 from behind the pollen of the abdomen covers thinly almost the en- 

 tire dorsal surface, more dense at the base where in side view it 

 seems to form slightly interrupted crossbands. The fourth segment 

 in side view is shining except at base. 



