OF WASHINGTON, VOLUME XVIII, 1916 105 



are four vittae on the thorax instead of two, and these are coppery 

 colored. The first joint of the male hind tarsi is also noticeably 

 more slender. 



Chrysogaster pacifica, new species. 



Large, robust, dark, greenish bronzy black species, the largest of this 

 group. 



Male: Ocellar triangle and frons with rather long blackish hairs. 

 Frons shining black, noticeably inflated. Antennae reddish brown, third 

 joint twice as long as broad; arista darker, a little longer than antennae. 

 Face shining, black, with short whitish pile, not excavated and the mouth 

 margin but little produced and not reaching as far forward .as antennal 

 prominence. A whitish pollinose stripe extends across to the eyes just 

 below the antennae and below this the face is broadly, faintly rugulose. 

 Thorax with very short, whitish pile. Mesonotum with four da.rk vittae. 

 Disc of abdomen subopaque. Wings somewhat smoky. Squamae blackish, 

 the halteres darker. Length 8.5 mm.; wing 6 mm. 



Type: Cat. No. 20281 U. S. Nat. Mus. 



Described from two males without locality labels but labelled 

 "Collection Coquillett" and determined by Coquillett as C. nigro- 

 vittata, which is a Californian species (the different length of 

 antennae distinguishes it at once from nigrovittata) . Since much 

 of Coquillett 's early material was from California and since he 

 determined it as a species described from California, the surmise 

 that California is the habitat for this species would seem justified. 



This species is easily recognized by its large size, rather long, 

 dark pile on the frons and the straight face with the mouth margin 

 but slightly produced. It resembles Chryscgaster robusta some- 

 what in general appearance, but its longer antennae and the 

 color of the squamae and halteres at once distinguish it. 



Ghrysogaster sinuosa Bigot. 



Medium sized, dark, steel blue species. 



Mule: Frons and ocellar triangle bluish black, with blackish hairs. 

 Antennae reddish yellow, darker on upper margin, third joint about one 

 and one-half times as long as broad; arista darkened at the base, yellowish 

 towards the tip, a little longer than the antennae. Face shining bluish 

 black, entirely" bare but for a few hairs along the eyes; just below the an- 

 tennae, a whitish pollinose cross band extends to the eyes, the face faintly 

 rugulo.se lielow this. Face receding, the mouth margin but little produced. 

 Thorax with minute whitish pubescence. Mesonotum with four distinct 

 blackish vittae. Disc of abdomen subopqauc, the rest of the dorsum 

 shining. Hypopygium prominent, with whitish pile. Wings with a black- 

 ish tinge. Squamae and halteres blackish. Length: 7 mm.; wing 5 mm. 



Female: Frons with very short pile, longer on the vortex, with the 



