AMERICAN DIPTERA. 255 



Dioctria resplencleiis. 



Dioctria resplendens Loew, Cent., X, 21, 1872. 



(^. — Length 5.6 mm. — Everywhere, except the head, polished green- 

 ish-black, beautifully resplendent upon thorax and abdomen; mystax 

 very dense, fulvous; wing black. 



The greenish-black polished thorax and abdomen, the blackish 

 hyaline wings narrowly white along the veins, the black proboscis, 

 palpi and antennae, the fulvous pile of mystax, front, basal segments 

 of antennae, occiput, thorax, abdomen, — all make this an easily recog- 

 nizable species. The pile of the legs in many places is nearly white. 

 The wings have most beautiful violaceous reflections and are rather 

 broad for the genus. The mystax is more dense than that of the most 

 of the species of Dioctria. This species resembles an Echthodopa, but 

 the posterior femora being without bristles make it a Dioctria. 



Type. — M. C. Z. A single male specimen. There is another 

 specimen at the National Museum also from California, col- 

 lected by C. A. Stearns. 



Habitat. — California (H. Edwards). 



Dioctria riibida. 



Dioctria rubidus Coquillett, Can. Ent., XXV, 80, 1893. 

 (^. — Length 7 mm. — Thorax and scutellum polished black, quite 

 thickly light pilose- abdomen polished, reddish-brown; segment 1, 

 and sometimes segment 2 and a large portion of segments 3 and 4, 

 black. Legs yellowish; coxae, trochanters, apical three-fourths of 

 tibiae and all the tarsi black. Head black with light yellow pile. 

 Face covered with a very short, brassy-yellow pubescence, and a little 

 pile above on each side; above the center with a large fovea, below 

 which is a large gibbosity bearing a rather dense mystax. Antennae 

 black; first segment one and one-fourth times as long as the second, 

 the third segment slightly longer than the first two taken together, the 

 style one-sixth as long as the third segment, very robust, blunt at tip. 

 Halteres yellow. Abdominal pile very sparse, short, light yellow. 

 Wings blackish; all the posterior and anal cells open. 



Type.— A]. S. N. M., Cat. No. 924. Three male specimens. 

 Habitat. — Los Angeles Co., Cal. (D. W. Coquillett). 

 This species is easily recognized by the polished reddish- 

 yellow femora and middle tibiae. 



Dioctria sackeni. 



Dioctria sackeni, WiUiston, Trans. Am. Ent. Soc, XI, 8, 1884. 

 "(^. — Length 7 min. — -Black; basal half of wings light yellow, distal 

 half blackish; fore feinora below, tip of middle and hind femora, four 

 front tibiae except their tips, and basal half of the hind tibiae reddish- 

 yellow. 



TRANS. AM. ENT. SOC., XXXV. JULY, 1909 



