232 ERNEST A. BACK. 



the middle coxae; scutelluin pilose, with a row of thin bristles along its 

 edge. Abdomen short, moderately broad, not much narrowed poster- 

 iorly; shining black, the posterior margins of the segments narrowly 

 red, but obscured by a thick white pollen which leaves the black to form 

 a large semi-oval spot nearly reaching the hind margin in the middle 

 and only narrowly separated from the small black spot on the anterior 

 angles which extends to, or nearly to, the hind margin. A circle of long 

 bristly hairs near the tip black; otherwise the short, not abundant, 

 pile is yellowish, whitish or white. Legs black, rather thickly clothed 

 with short fine white pile, along the under side of the hind femora 

 and tibiae a little longer and more thickly erect pilose, as in Dioctria; 

 bristles mostly white. Wings pure hyaline, the first posterior cell closed 

 a little before the tip or at the tip, the fourth at a considerable distance 

 before the border." 



Type. — University of Kansas. A single specimen. 

 Habitat. — Kern Co., Cal. 



The Am. Ent. Soc. of Phila. possesses a single specimen from 

 California. 



Tricli.s tlavipilis. 



Tricilis flavipes Jones, Trans. Am. Ent. Soc. Phila., XXXIII, 

 275, 1907. 

 "9- — Length 10 mm. — Black, shining with a bluish tint. Front 

 wide, deeply excavated, ocelli on a prominence, yellowish-red pruinose; 

 bristles on each side and those of the ocelli black. Face thickly 

 yellowish-red pruinose, when viewed in profile no convexity can be 

 seen beyond the margin of the eyes until half way below the antennae, 

 where the gibbosity is very pronounced. Mystax not extending above 

 the gibbosity, black on upper part and yellowish-red on the lower 

 part near the oral margin, a few reddish hairs immediately below the 

 base of the antennae. Antennae black, first joint longer than the 

 second, third not as long as the first two taken together, style a little 

 more than a fifth of the third joint, second joint of style more than 

 twice as long as the first, hollowed out on the upper side, from which 

 a microscopic bristle arises; first two joints of antennae with black 

 and reddish pile and longer black bristle-like hairs on the underside 

 of the first joint. Occiput with reddish pollen; occipito-orbital bris- 

 tles black, pile of the occiput, oral margin and beard fine, grayish-white 

 in color, that of the occiput having a reddish tint. Thorax black, 

 shining, covered with short, dense, yellowish-red pile, longer on the 

 posterior margin, a few bristles on the lateral margins black. Scutel- 

 lum of similar color and covered with pile of similar color to that of 

 the thorax, with a row of thin, light-colored bristles on the posterior 

 margin. Pleura black, covered with dense yellowish-white pollen and 

 sparse, light-colored pile, a shining spot on the mesopleura extending 



