INSECUTOR INSCITI/E MENSTRUUS 147 



Rostrum brownish yellow ; palpi dark brown. Antennae with 

 the first scapal segment yellowish, the remainder of the an- 

 tennae dark brown ; the second scapal segment appears flat- 

 tened, disk-like, in the material at hand. Head light yellow, the 

 vertex brownish medially. 



Mesonotal praescutum light yellow, the usual interspaces 

 represented by broad, very faint and indistinct, reddish lines 

 that broaden out on the sides of the sclerite. Pleura yellowish. 

 Halteres pale with dark brown knobs. Legs with the coxae 

 and trochanters yellowish ; femora yellowish with the tips dark 

 brown, these broadest on the fore legs, narrowest on the hind 

 legs; tibiae and tarsi brown. Wings almost hyaline, the costal 

 cells more yellowish ; stigma indistinct ; veins brown. Venation 

 almost as in O. deviata Dtz., the r-m crossvein longer and more 

 arcuated. 



Abdominal tergites yellow, the basal tergites indistinctly 

 brownish medially, the sternites more yellowish. Male hypo- 

 pygium reddish, similar in structure to O. deviata Dtz. of the 

 eastern United States, but the apices of the lobes of the eighth 

 sternite are more pointed, and the outer pleural appendange 

 distinctly narrowed to the somewhat pointed apex. The gona- 

 pophyses are produced beyond the genital chamber as slender, 

 stylet-like rods that emerge just beneath the ninth tergite. 



The female is very similar to the male but larger. 



Habitat — Oregon. 



Holotype, $ , Forest Grove, Washington County, June 3, 

 1918 (F. R. Cole). 



»Allotopotype, 9 . 

 Paratopotypes, 2 5 's. 

 Type in the collection of the author. 



O. stylifer is closest to O. deviata Dtz. with which it agrees 

 in the structure of the eighth sternite and gonapophyses of the 

 male hypopygium. O. deviata is, in all respects, a much darker 

 colored fly. 



Cladura oregona, new species. 



Coloration light yellow, the mesonotum opaque ; tips of the 



