218 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



102. Tetragoneura pimpla Coq. 

 Forest Grove, 11-17 (Cole). 



103. Tetragoneura quintana Cole, new species 



Male: Length, 3.5 mm. General body color black. Head 

 black, the palpi and other mouth parts blackish brown. 

 Antennae blackish, the third joint twice as long as wide, the 

 succeeding joints decreasing in length to the last joint, which 

 is half again as long as the penultimate. 



Mesonotum, scutellum, pleura and postnotum black, with 

 a brownish tinge, made lighter by the gray pollen. Bristles 

 of thorax yellowish. Halteres brownish yellow, the knobs 

 darker. 



Abdomen dull blackish brown with sparse yellowish pile. 

 Hypopygium blackish brown, the lower forceps rather large, 

 the tip excavated, with a yellow thorn below. Hind legs 

 blackish brown, including the coxae; middle legs with the 

 femora yellowish brown; fore legs with the coxae, femora 

 and base of tibae more or less yellowish. Wings grayish 

 hyaline, the costa and radial veins heavy and dark brown, 

 the other veins thinner and paler; subcosta ends in R x nearer 

 the base of the radial sector than the humeral cross-vein. 

 Cell Ri very small, usually forming a small triangle; anterior 

 branch of cubitus detached at base but reaching proximad of 

 base of R-M cross vein. 



Female: Much like the male, the femora paler. Geni- 

 talia yellowish. The basal two joints of the antennae yel- 

 lowish and angles of pronotum yellow. 



Holotype, male, No. 829, and allotype, female, No. 830, 

 Mus. Calif. Acad. Sci.; F. R. Cole, collector, March 27, 

 1919. 



Type locality, Forest Grove, Oregon. 



This is the fifth species in the genus Tetragoneura one of 

 which is a fossil species. The one described above is in the 

 group with bicolor and pimpla, where the subcosta ends in 

 Ri but differs in color from both of these, in the shape of 

 the cell R lt and in the forking of the cubitus, the anterior 

 branch not being detached in the related species. 



