SNOW: DRSCRIPI'IOXS OF NORTH AMKRICAN IRN' I'F. 1 ID.!'.. 1 67 



narrowed almost to a point posteriorly; yellow, spotted with black; 

 first segment obscurely black at base: second segment with two large 

 lateral black spots; following segments each with four similar spots, 

 so large and close together as to leave little room for the yellow; pile 

 rather long, glistening yellow on the yellow ground color, and black 

 on the spots. Legs strong, yellow, with the usual bristles yellow. 

 AVings of a very moderate breadth, tip narrower: the blackish picture 

 is neither banded nor reticulate, but with large irregular spots; a 

 square spot nearly llUing the stigma, reaches the third vein; a very 

 large irregular spot fills the discal cell completely and the adjacent 

 cells partially, leaving in the third posterior cell two large clear spots, 

 the smaller one at the base and the larger one in the posterior portion 

 of the cell: a large apical blackish spot covers over the first posterior 

 cell except the base, fills out the ends of the marginal and submarginal 

 cells and laps over the fourth vein into the second posterior cell; the 

 humeral cross vein is broadly infuscated; a small black spot in the 

 second costal cell lies next the costa; third vein with very few bristles 

 near the base; fifth vein bare; lower corner of anal cell slightly 

 drawn out; cross veins steep, not very near together. 

 Length, 3.5 mm. 



One specimen, Mt. Hood (Morrison). 



This species cannot be well placed in any of the genera already 

 established. The broad front, narrow cheeks, six bristled scutellum, 

 peculiar pile, and odd wing picture sufficiently isolate it as the type 

 of a new genus. In two other North American genera the scutellum 

 bears six bristles, namely: Hcxaclueta and Blcpliaroiieiira, but Xcuo- 

 chtvta cannot by any means be confused with these, which are 

 characterized especially by their alar jncture and the presence of 

 bristles on the fifth vein. 



Eutreta sparsa Wied. 



Five males and three females, White Mountains, Maine, Buffalo, 

 New York (Van Duzee); are typical specimens. 



Other western specimens show varietal differences at least. A male 

 and female (PI. ^^II, f. lo), California, have wings narrower than do 

 the eastern specimens-, with the rather dim pellucid drops extending 

 to the costa anteriorly, varying in size and arranged with little regu- 

 larity. Drops occur even in the first and third costal cells. 



Length. 5.5 mm. 



A single male. State of Washington ( .Nforrison ), agrees in size with 

 typical specimens, but has the yellowish drops of the wings largely 

 confluent in the middle and basal regions, and reaching the costa 

 anteriorly. 



