DIARTHRONOMYIA CALIFORNICA n. sp. 



(Diptera, Itonidae) 



DR. E. P. FELT 

 STATE ENTOMOLOGIST, ALBANY, NEW YORK 



The species described below w;is reared by Mr. C. F. Stahl, Marcli 12, 191'2, 

 from galls on Artemisia cnlif arnica, at C'laremont. C'al. This species is most 

 easily separated from D. arte mi sine Felt, by the smaller number of antennal 

 segments. 



Gall — Length 1.,") nnn.. diameter ..'} mm. A brownish or reddish, sub-eonieal, 

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

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

 off by the escaping midge. 



Male — Length 1.25 mm. Antenna? nearl\' 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. Mesonotum reddish brown. Scutellum yellowish red, postscutellum fus- 

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

 pale yellowish. C'oxif and legs apparently fuscous yellowish, the claws slender, 

 unident.ite. the ])ulvilli shorter than the claws. Genitalia; basal clasp segment 

 stout: terminal elas|) segment short, greatly swollen; dorsal ))late .short, deeply 

 and roundly em.-irijinate, the lobes broadly rounded: \entr.il plate short, broadly 

 and roundly emarginate, the lobes narrowly rounded. 



Female — Length 1..^) mm. Antennae extending to the base of the abdomen, 

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

 nearly twice its diameter; terminal segments slightly |)roduced, 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. Tyi)e Cceid a226<}. 



