104 INSKCUTOR inscitL'-e; mknstruus 



prominent, palpi rather stout, with strong bristles. Cheeks 

 each with two very strong bristles and a series of much smaller 

 ones running up the orbits to the antenn?e. Mesonotum rather 

 elongate, shining; scutellum subtriangular, with only two 

 bristles ; dorsocentral bristles well differentiated, without any 

 smaller bristles between them. Pleurse shining, propleura with 

 several bristles next the front coxa and a couple of minute 

 ones just below the spiracle ; mesopleura bare. Abdomen bare 

 at base, but rather bristly near apex, especially on the sixth 

 segment. Hypopygium of moderate size, not shining, with 

 some bristles at the base, especially below, and also with 

 several minute bristles near the base of the anal organ which 

 is rather small and furnished with unusually stout hairs. Legs 

 rather stout, but the tarsi all slender ; hind femora without 

 noticeable hairs below ; cilia of hind tibise short, delicate and 

 widely placed, very weak near the base and apex. Wings 

 very long and narrow, with the costa extending well be- 

 yond the middle ; its cilia short and very closely placed, ex- 

 tremely short near the base of the costa ; first section slightly, 

 but distinctly, longer than the other two combined ; second half 

 as long as the first and nearly three times as long as the third ; 

 fork of third vein rather acute and the cell long; fourth vein 

 sharply bent at base, straight beyond and faintly recurved at 

 tip ; fifth slightly sinuate ; sixth strongly so ; seventh very long. 



Type from Lyndon, Washington, July 29, 1908 (Melander). 



This species is not closely related to any described North 

 American species ; among the European species it would fall 

 near longiseta Wood, from which it differs at once by its 

 broader front, infuscated wings, and longer first section to 

 the costa. 



