Pomona College, Claremont, California 89 
with a broad spatulate blade, as in the meigenii group of this genus, the apex deeply 
notched medially. 
Habitat.—Oregon. 
Holotype, ¢, Forest Grove, March 26, 1919, (F. R. Cole). 
Allotopotype, ?. 
Paratopotypes, 2 6s; paratypes, 1¢, 12, Hillsboro, April 1, 1919, (F. R. Cole). 
This little species is evidently the Western representative of the common QO. 
meigenii (O. S.) of the Eastern States, its general appearance being very like that 
species. In the structure of the male hypopygium, however, it runs closes to O. 
cornuta (Doane), which may be told by the different color of the wings and the 
structure of the hypopygium. 
Genus Gonomyia Meigen. 
Gonomyia (Gonomyia) coloradica, sp. n. 
Belong to the blanda group, closest to mathesoni Alex.; general coloration yel- 
lowish, the prescutum with three broad, confluent stripes of reddish brown; wings 
with the petiole of cell M2 long; male hypopygium with the structural details very 
different from those in G. mathesoni. 
Male.—tLength, about 4.5 mm.; wing about 6 mm. 
Rostrum, palpi and antenne dark brown. Head dark. 
Pronotal scutum and the collare dark brown; pronotal scutellum pale. Mesonotal 
prescutum with three broad, reddish-brown confluent stripes, the humeral regions 
cephalad of the lateral stripes pale; scutellum pale. Pleura pale, indistinctly striped 
with brown. Halteres pale, the knobs dark brown. Legs with the coxe and trochanters 
pale; femora light brown; remainder of the legs broken. Wings subhyaline, un- 
spotted ; stigma lacking; veins brown. Venation: almost as in G. mathesoni with the 
following details different: R2 very oblique and apparently contiguous with the tip of 
R1; R2+3 not angulated before the middle of its length and without a faint spur of r 
at this point; petiole of cell M2 much longer, one-half longer than the fused portion 
of Cul and M. 
Abdomen light brown. Male hypopygium generally similar to that of G. mathe- 
soni, differing as follows: The bifid pleural appendage is very similar in the two 
species, in the present species with the needle-like tip of the longest arm abruptly pale. 
The long, sinuous appendage in mathesoni is here represented by two, the longer of 
which is pale throughout, flattened, the long tip acicular and almost straight; the 
shorter appendage is flattened, before the tip a little expanded, with a long, slender, 
curved biack-tipped apex. Near the base of these pleural appendages is a flattened 
subtriangular lobe which is covered with an abundance of short sete; in G. mathesoni, 
this appendage is very small, cylindrical, with but few sete and with a distinct finger- 
like spinous lobe on one side. Penis-guard distinctly trifid at its apex, the lateral black 
spines directed almost caudad, setigerous at their bases; a shorter median pale lobe. 
Habitat.—Colorado. 
Holotype, ¢, Longview, June 24, 1916 (E. C. Jackson). 
Type in the collection of the United States Biological Survey. 
