OF WASHINGTON. 147 



cheeks, halteres, tibiae, tarsi, and apices of femora, yellow. Proboscis 

 very slender, the labella longer than the proboscis proper. Mesonotum 

 opaque, grayish pruinose, pleura highly polished, the abdomen some- 

 what polished. Wings hyaline, stigma yellow, before its apex with a 

 brown spot which extends to the second vein, a second spot midway 

 between this and apex of second vein, crossing the marginal cell; 

 one at apex of second, third, and fourth veins, at middle of last 

 section of third vein and of penultimate section of the fifth; small 

 and hind cross-veins narrowly bordered with brown; small cross-vein 

 at middle of discal cell ; veins except the first vein bare. Length 3 mm. 



Clarendon, Tex. Two males bred June 2, 1906, from flower 

 heads of Grindelia squarrosa nuda by Mr. W. D. Pierce, the 

 flower heads having been collected September 19, 1905. 



Type. — No. 10035, U. S. National Museum. 



Three additional specimens which were also bred from flower 

 heads of this plant indicate that the markings on the wings are 

 somewhat variable, the brown stigmal spot sometimes extend- 

 ing to the small cross-vein, or even crossing the discal cell, 

 while some of the other brown spots are more extended than in 

 the type specimen, 



Mutiloptera, n. gen., Geomyzid^e. 



Readily recognized by the unusually narrow wings, which are over 

 six times as long as wide. Third joint of antennse oval, the arista 

 subbasal, sparsely short-plumose. Two pairs of vertical bristles, one 

 pair of fronto-orbital, ocellars present, postvertical wanting. Face in 

 profile strongly concave, vibrissse present, a stouter bristle a short dis- 

 tance behind each, cheeks less than one-fifth as wide as the eye- 

 height, occiput convex. Proboscis short, robust, labella terminal, 

 palpi clavate, well-developed. Thorax bears three pairs of dorsocentral 

 bristles, three supra-alar, two notopleural, one humeral, one sterno- 

 pleural; scutellum with only one pair. Tibiae without bristles except 

 at the apices of the inner side of the middle and hind pairs. Wings 

 strongly convex on the costa, the latter not spined, hind margin of 

 wings strongly curved inward in the middle, extending along the hind 

 edge of the anal cell, thence to the middle of the hind edge of the discal 

 cell which it follows to its apex, then extends parallel with the fourth 

 vein, finally curving forward to meet the costa at the tip of the third 

 vein; first vein reaches the costa at a point less than half way from 

 the humeral to the small cross-vein, auxiliary vein ends in the first 

 before the apex of the latter; basal, anal, and discal cells present, the 

 latter unusually narrow. 



Type. — The following species : 



