18 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.79 



vibrissae well above the front edge of mouth; palpi yellow, rather 

 strongly bowed, beset with black hairs, which are longer on lower 

 edge; antennae reddish, third joint more or less infuscated, about 

 twice as long as second and distinctly narrower than one paraf acial ; 

 arista hardly as long as antennae, reddish and thickened on proxi- 

 mal third, penultimate joint about as broad as long; cheeks red in 

 ground color, bluish-white pollinose, thickly haired, in profile about 

 one-seventh the eye height. 



Thorax black, subshining, thinly dusted with white pollen, which 

 has a distinct bluish sheen; mesonotum marked with narrow black 

 stripes, which are indistinctly visible when viewed from behind; 

 scutellum red except on narrow base, thinly covered with blue-white 

 pollen ; calypters opaque, white, the rims tinged with yellow. 



Abdomen broadly red on sides with a wide black median stripe 

 produced laterally on the hind margins of segments 2 and 3 and 

 expanding on the first including all but the posterior half at sides ; 

 last three segments except the red apex of fourth covered with thin 

 bluish-white pollen interrupted by a narrow median vitta and the 

 usual dark reflecting spots on base of fourth ; first two segments vvdth- 

 out median marginal bristles ; third with a marginal row of 10 to 14 ; 

 fourth with an apical row and covered with erect bristly hairs in 

 front ; hairs on intermediate segments depressed ; venter without any 

 defined patches of dense hairs; genital segments small, retracted; 

 outer forceps yellow, more tapering and pointed than usual; inner 

 ones with a shallow notch at the curved apex, sharply keeled behind 

 on basal two-thirds and exceeding the outer pair by about one-fourth 

 their length ; fifth sternite broadly and deeply incised, yellow. 



Legs slender, black, the tibiae obscurely yellow; front claws and 

 pulvilii equal the combined length of last two tarsal joints; mid 

 tibiae with one stout bristle on outer front side beyond middle ; hind 

 tibiae thickly ciliate. 



Wings hyaline with a yellow tinge at base; venation ordinary; 

 third vein with one or two hairs at base ; costal spine none. 



Length, 10 to 11 mm. 



Female. — Unknown. 



Type.—M'AQ, U.S.N.M. No. 43340. 



Described from 3 male specimens from Hell Canyon, N. Mex., 

 Manzano National Forest, September 16-19, 1916, on foliage of 

 Quercus sp. (C. H. T. Townsend). 



The species resembles ignohilis, but in the latter form the pollen 

 on the front and face is plumbeous; the region of the vertex black 

 and subshining; hairs on intermediate abdominal segments more or 

 less erect; median marginals on second segment; antennae wholly 

 black, etc. 



