96 NEW YORK STATE MUSEUM 



Professor Mik in the Wiener Ent. Zeitung, 1894, p.164, says: 



" Dieses Geader lasst sich ohne Miihe auf jenes der Gattung 



Corynoneura Winnertz zuruckftihren ( Vergl. V. d. 



Wulp Dipt Neederl. 1877. Pl.VIII. fig.6), ohne dass ich 

 hiermit etwa den Bestand der Gattung Tersesthes anzweifeln 



mochte " Upon comparison of this description with 



that of Leptoconops Skuse, and of pl.35, fig.10, with fig.14, 

 it will be seen that these genera are certainly very closely related 

 if not identical. The only marked difference is that Lepto- 

 conops has two small basal palpal joints while Tersesthes 

 is said to have but one (i. e. Leptoconops has four-jointed 

 and Tersesthes three-jointed palpi) . Only one .speciesf 



Tersesthes torrens Townsend 

 1893. Tersesthes Town. Psyche. 371 



Female. General golor blackish; eyes dark brown; antennal 

 excavations cinnamon color, nearly three times the diameter of 

 first antennal joint; front, face and lancets shining black, the 

 front with four blackish hairs on vertical margin arising from 

 four papillae; antennae black, clothed with whitish pubescence; 

 palpi blackish, labium brownish with some whitish pu'bescence 

 terminally; occipital orbits with a few blacK hairs. Thorax and 

 scutelhnn deep shining black, smooth, glabrous, except that the 

 thorax has some scattered black hairs anteriorly. Abdomen soft 

 opaque brown, varying to light brown, in some of the specimens 

 flavous or rufous at base; balsam mounts showing two oval black 

 spots (bodies?) at base of fifth segment; ovipositor brownish. 

 Legs blackish, tarsi .brownish, tibiae slightly so. Wings grayish 

 hyaline, with hardly a smoky flavous tinge, the delicate fringe 

 of hind margin somewhat longest on anal angle' where it termi- 

 nates abruptly; veins pale, except first and second longitudinal 

 veins, which are brown and end in a brown stigma on costal 

 margin (the first vein becomes obsolete just before reaching 

 stigma) ; halteres brownish, knobs whitish. 



Length of body (inc. ovipositor), one and three-fifths milli- 

 meters (empty) to two and one-fifth millimeters (abdomen 

 distended with blood) ; of wing one and one-fifth millimeters. 

 Fresh and alcoholic specimens are slightly longer. Described 

 from both dried and alcoholic specimens and balsam mounts. 

 Six specimens collected June 21, on Continental divide, Socorro 

 county N. Mex., 7000 ft. 



