2l8 WHEELER. [VOL. I. 



Wings rather long, with nearly parallel costal and posterior 

 margins. Third and fourth veins somewhat lyrate towards 

 their apices; posterior cross vein oblique, longer than its dis- 

 tance from the posterior margin. Tegulae with very short 

 cilia. 



The characters of this genus are strongly marked. The 

 neuration resembles that of Hydrophoms and allied genera. 

 The antennae are very aberrant, and, especially in the first 

 species to be described, remind one of the antennae of Tabanus. 

 In this genus, however, the projection on the third joint is 

 dorsal, and not ventral as it is in Drcpanomyia. Other very 

 marked peculiarities of the new genus are the broad face in the 

 male, the large palpi, and the absence of the rows of thoracic 

 macrochaetae which are so generally present in Dolichopodidae. 



Drc'pauomyia pruinosa, n. sp. 



Male.- - Length of body, 6.5 mm. Length of wing, 5 mm. 

 Dull metallic green, thickly coated with glistening white dust. 

 Palpi yellow, with short black bristles. Antennae black, ven- 

 tral surfaces of the first and second joints yellow; basal joint 

 twice as long as the second; third joint large, flattened, its 

 ventral edge with a very pronounced projection, half as long as 

 the dorsal projection on which the arista is inserted. Arista 

 short, thick, two-jointed, pubescent, bent downwards. Face 

 and front broad, thickly covered with white dust ; vertex and 

 occiput more metallic green. Cilia of the superior orbit not 

 very numerous, short, black; those on the inferior orbit longer 

 and more abundant, yellowish white. Thoracic dorsum opaque, 

 with two conspicuous accumulations of white dust on either 

 side, one in the humeral, the other in the prealar depression. 

 Middle of the thorax traversed longitudinally by two darker 

 bands which fade out posteriorly. Pleurae uniformly and 

 thickly covered with pale dust. Abdomen with a moderate 

 layer of dust and with short black hairs on all the segments 

 like those which cover the thoracic dorsum. The swollen and 

 projecting base of the hypopygium is without hairs, but cov- 

 ered with thick yellowish dust. The partially projecting inner 



