V 



148 INSECUTOR INSClTlyE MENSTRUUS 



femora and tibiae scarcely darkened ; wings grayish, more yel- 

 lowish basally and along the costal region. 



Male. — Length about 5.5 mm. ; wing, 7.4 mm. 



Rostrum light yellow with a sparse white bloom ; palpi yel- 

 low basally, the two terminal segments and the apical half of 

 the second brown. Antennae with the basal segments yellowish, 

 the last twelve segments brown ; there are twelve elongate 

 flagellar segments beyond the small fusion segment. Head 

 dark gray. 



Thorax opaque, yellow, without markings. Pleura a little 

 more whitish. Halteres light brown, the knobs a little darker. 

 Legs with the coxae and trochanters light yellow ; femora and 

 tibiae a little more brownish, the tips of the former very slightly 

 darkened ; tarsi dark brown except the basal half of the meta- 

 tarsi which are more yellowish. Wings pale gray, unmarked, 

 the base of the wings, the costal region, and along vein Cu 

 more yellowish ; stigma indistinct ; veins brown. Venation : 

 Almost as in C. flavoferruginea; Rs a little longer and not so 

 arcuated at its origin ; basal deflection of R^'^r, very reduced ; 

 r-m long, angular ; cell ist M., smaller ; cell M^ deeper. 



Abdomen light yellow, the mid-tergal region brown ; eighth 

 and ninth segments darkened to form a subterminal ring. 

 Male hypopygium as in C. flavoferruginea, the pleural append- 

 ages long and slender, a little enlarged and curved at their 

 apices. 



Habitat. — Oregon. 



Holotype, $ , Forest Grove, Washington County, September 

 30, 1918 (F. R. Cole). 



Type in the collection of the author. 



C. oregona is a well-defined species that differs conspicuously 

 from C. flavoferruginea O. S., its closest relative, by the uni- 

 formly gray wings and structure of the male hypopygium. In 

 general appearance it is very like Crypteria americana Alex., 

 likewise from Oregon, but is readily told by the generic char- 

 acters. 



