DIARTHRONOMYIA CALIFORNICA n. sp. 



(Diptera, Itonidae) 



DR. E. P. FELT 

 STATE ENTOMOLOGIST, ALBANY, NEW YORK 



The species described below was reared by Mr. C. F. Stahl, March 12, 1912, 

 from galls on Artemisia calif ornica, at C'laremont, Cal. Tiiis species is most 

 easily separated from D. artemisiae Felt, by the smaller number of antennal 

 segments. 



Gall — Length \.Ci mm., diameter .5 mm. A brownish or reddish, sub-conical, 

 thin-walled growth protruding at an oblique angle from the under side of the 

 narrow leaflets. The slender, darker tip of this monothalamous gall is pushed 

 off by the escaping midge. 



Male — Length 1.2.5 mm. Antennse nearly as long as the body, sparsely 

 haired, fuscous yellowish; fourteen segments, the fifth with a stem three-fourths 

 the length of the cylindric basal enlargement, which latter has a length nearly 

 twice its diameter; terminal segment reduced, obtuse. Palpi probably biarticu- 

 late. .Mesonotuni reddish brown. Scutellum yellowish red, postscutellum fus- 

 cous. Abdomen yellowish. Wings hyaline, eosta light straw. Halteres probably 

 pale yellowish. Coxas and legs apparently fuscous yellowish, the claws slender, 

 unidentate, the pulvilli shorter than the elaws. Genitalia; basal clasp segment 

 stout; terminal clasp segment sh.ort, greatly swollen; dorsal plate .short, deeply 

 and roundly emarginate, the lobes broadl\- rounded; ventral plate short, broadly 

 and roundly emarginate, the lobes narrowly rounded. 



Female — Length \.!S mm. Antennse extending to the base of the abdomen, 

 sparsely haired, yellowish; fourteen siibsessile segments, the fifth with a length 

 nearly twice its diameter; terminal segments slightly jirodueed, tapering. Color 

 characters nearly as in the male, except that the abdomen is deep reddish, the 

 ovipositor nearly as long as the body, being yellowish; terminal lobes narrowly 

 oval, with a length nearly twice the width. Type Cccid a2269. 



