Pomona College, Claremoiit. California 23 



deep and connected; first antenna! joint slightly longer than 

 second, yellow; second and third joints black, the third joint about 

 as long as the first two combined, narrower (see fig. 6), with a 

 short sub-apical style. Vertex and upper occiput rather full (see 

 fig. 7), black, the lower occiput and cheeks yellow, occiput largely 

 silvery pollinose, the pile minute and whitish. 



Mesonotum and scutellum shining black, the pile on median 

 portion of mesonotum and on scutellum short, blackish, on margins 

 of mesonotum white. Humeral callosities yellow, silvery pollinose; 

 a silvery pollinose, white pilose spot just back of humeri. Pi-escu- 

 tellar callosities partly yellow. Pleura shining black, the upper 

 mesopleura, the metapleura and hypopleura silvery pollinose and 

 white pilose. Halleres white. 



Abdomen largely shining black, rather broad posterior mar- 

 gins of all segments yellowish ; apical half of seventh visible seg- 

 ment lemon yellow ; yellow on first segment reaches lateral margins, 

 on the second to sixth segments it does not do so. Pile of abdomen 

 very fine, sparse, white, longer on sides of first and second. Venter 

 largely brownish yellow, blackish at base, lemon yellow on genitalia. 

 Femora, tibiae, first tarsal joint, apex of fifth and base of claws 

 honey yellow; third and fourth tarsal joints, apex of second and 

 base of fifth blackish. Coxae and trochanters colored like femora, 

 a black spot below on base of trochanters. Wings hyaline, all 

 veins yellow at base, toward apex and posterior margin blackish. 

 All cells on posterior margin of wing wide open (see fig. 8). 



Holotype, a female, collected at Palm Springs, Cal., May 20, 

 1917 (E. P. Van Duzee), in collection of California Academy of 

 Sciences. The type a unique. 



This species differs from elegans Coquillett in having the first 

 antennal joint yellow and in the greater extent of black on the 

 abdomen. Coquillett gives no structural characters to distinguish 

 his species. The above described species differs from cincturus 

 Williston, from Mexico, in the smaller size and in the color of the 

 antennae and legs, cincturus having entirely black legs. 



Metacosmiis nitidus new species. 



Female. Length 5.5 mm. Head black, a small amount of yel- 

 low on sides of oral margin. Ocellar tubercle slightly above 

 middle of frons but the lower ocellus nearly in the center; upper 

 half of frons with white pile, the lower part with black; frons 

 shining black, the narrow orbits silvery pollinose. Antennae black, 

 rather short and thick, the second joint larger than first (see fig. 

 4). Upper face and lower frons near base of antennae silvery pol- 

 linose; face short, shining black, distinctly projecting. Occiput 

 thinly gray pollinose, short, sparse white pilose; on the under side, 

 back from mouth opening, an oval yellow spot on each side of 

 middle. Proboscis not projecting beyond oral margin. 



