324 THE CANADIAN ENTOMOLOGIST 



near the tip two stout divergent hairs; pcnis-guarcl seen from 

 beneath, a powerful, quadranguhir, chitinized base whose caudal 

 angle is a ventrally directed hook, the base on cither side subtended 

 by short gonapophyses that end in sharp, chitinized, conical spines; 

 from above and dorsal of the quadrangular base arise two divergent, 

 cylindrical, pointed, chitinized arms. 



Gonomyia (Gonomyia) californica, sp.n. 



Male — Length 7 mm.; wing mm. 



Female — ^Length 7-9 mm.; wing 6.6 mm. 



Rostrum and palpi dark brown. Antenuii- wiili the first 

 segment dull \ellc)w above, the Hagellum dark brown. Head 

 bright, pale yellow passing into brown on the sides of the occiput 

 and vertex; a narrow, dark brown median vitta. 



Pronotum pale with two divergent brown lines that are 

 connected at the anterior end. Mesonotal pra'scutum dull yellow 

 with three dark brown stripes that are confluent, only the areas 

 about the pseudosutural fovea' and backward along the margin 

 of the sclerite being of the ground colour; scutum light l)rown, 

 the lobes dark brown, a dull \ellow spot on the lateral margin 

 above the wing-root; scutellum mostly brown, margined caudally 

 with yellow; postnotum dark brown, the basal portions yellowish. 

 Pleura light yellow with two dark brown bands, the dorsal one 

 Ijeginning on the propleura and including a small spot at the base 

 of the fore coxa, continuing backward as a broad band that sur- 

 rounds the base of the halteres and becomes confluent with the 

 brown of the mesonotal pra'scutum; the ventral band begins 

 behind the fore coxa, occupies the mesosternum and includes the 

 base of the middle and hind coxa?. Halteres pale, the knob brown. 

 Legs with the coxae as described above; trochanters pale yellow; 

 femora dull yellow with a dark brown anteapical annulus; re- 

 mainder of the legs broken. Wings subhyaline, the costal veins 

 yellowish, the remaining veins brown; dark brown spots on the 

 wing-disk as follows: at the humeral cross- v^in; at the arculus; 

 at the origin of Rs; at the tip of Sci; along the basal deflection 

 of Cin; at the basal deflection of Ri+b; cross- vein m; a large 

 stigmal area; at the fork R2+3; at the tips of cells Rs and Rb, 



