162 ERNEST A. BACK. 



second posterior cells greatly elongated but do not exceed three times 

 the length of the peduncle as Loew says. Fourth posterior cell sessile 

 or subsessile. 



Type. — M. C. Z. Single female type in good condition. 



Habitat. — Texas (type); Washington, D. C. (?). 



Loew furnishes us with the following note: "L. brevicornis 

 in color and markings of the body and the arrangement of the 

 veins of the wings approach nearest to L. favillaceus, but the 

 third segment of the antennae of the former is ovate and a 

 little shorter than the style, but of the latter, indeed, is quite 

 long, and longer than the style; besides the second submar- 

 ginal and the second posterior cells in the former also are 

 longer." 



Leptogaster eudicraims. 



Leptogaster eudicranus Berl. Ent. Zeit., XVIII, 353, 1874. 

 9 Length 8-9 mm. — Translation. — Of a dull, darker brown color; 

 the thoracic dorsum toward the lateral borders, the lateral margins 

 of the abdomen and the venter more ashy gray. Face densely snow- 

 white pruinose, the white mystax is made up of a single row of hairs. 

 Proboscis black, the same color appears to be on the everywhere 

 dark colored palpi. The first and third antennal segments black, the 

 second red. Front deep brown, the occiput white pruinose, the latter 

 with a transverse row of black bristles behind the vertex. The ground 

 color of the thorax appears on the humeri as far as the lateral margins 

 and extends to the posterior edge as a smutty reddish-brown, which, 

 however, the bloom does not render very perceptible. Pleurae with 

 denser whiter bloom, but after this is rubbed off, the same smutty 

 reddish-brown is seen. Abdomen dull brownish-black, hardly any- 

 where polished, and when so indeed only through the rubbing off of 

 the bloom; on the lateral margins and on the vertex more gray. In 

 a superficial examination of the abdomen, no lighter ground color is 

 hardly to be noted, but by a close scrutiny one rightly notices that 

 the outer lateral borders of the second segment and a little spot on 

 the anterior margin of the third segment have a leather-yellowish color 

 much concealed by the grayish bloom present there. Front coxae 

 reddish-yellow with a thicker white bloom; hind coxae reddish-yellow 

 with a thinner whiter bloom. Front femora brownish-yellow, on the 

 underside black, and on the upper side as far as the end, very much 

 darker; on the likewise colored intermediate femora the black color 

 appears no darker than the hinder side and a small, hardly apparent, 

 ring on the free apex; the front tibia; and tarsi lemon yellow, the former 

 on the anterior side and the last segment of the latter at tip, black. 

 Color of the hind femora at the base is of the same pale yellowish color, 



