352 A. L. MELANDER. 



This species is closely related to obesn Loew, but differs in the 

 much denser vestiture of the body. 



Empis ueoinexicaiia sp. uov. 

 Male and Female. Length of body 6 mm., of wing 9 mm. — Black species, finely 

 dusted with brownish pollen, devoid of all pile and bristles, the extremely short 

 and sparse pubescence of the body and legs whitish. Occiput gray dusted. An- 

 tennse black, moderately long, the third joint lanceolate, its style short and thick. 

 Palpi short, pale yellow; proboscis black, nearly three times the height of the 

 head. Thora.x; with four brown vittse, obliterated in front of the scutellum ; 

 scutellum and nietapleurse with no bristles. Abdomen cylindrical, the basal 

 segments dusky yellowish in the male, hypopygium not large, erect, pedunculate 

 by the flattened projecting basal piece, upper lamellae fleshy, yellow, middle 

 lamellse black, triangular, their free ends touching and encircling a deflexed 

 curved spur-like process, from the base of the forward side of the hypojiygium 

 arise a pair of long erect filiform reddish styles. Coxse and legs yellow, hind 

 legs from middle of femora ontward dusky, legs simple and slender in both sexes. 

 Halteres yellow. Wings hyaline, veins dark brown, thin, stigma faint, elongate, 

 situated far from the tip of the marginal cell, which extends considerably beyond 

 the furcation of the third vein, second section of the front border of the discal 

 cell five tunes the length of the first section, its hind border equal to the outward 

 continuation of that vein, anal vein wanting in the male, evanescent in the 

 female. 



One male and one female from the top of the Las Vegas Range, 

 New Mexico, June 28, 1902, altitude 11,000 feet. (H. L. Viereck). 



Eiiipis vaginiTer sp. no v. 



Mate. Length 5 mm.— Black, thickly overlaid with fine silvery-gray dust. 

 Eyes broadly contiguous above the antennje, facets uniform and small. Face 

 with brownish dust. Antennse short, black, not bristly, the third joint twice as 

 long as broad, its arista equal to its breadth. Palpi slender, short, yellow ; pro- 

 boscis nearly twice the height of the head, black. Occiput gray dusted, with 

 two irregular rows of sparse short black bristles above, and below with a small 

 bunch of fine white hairs on each side in back of the cheeks. Thorax dusted 

 with gray, almost devoid of hairs, the acrostichals and dorsi-centrals short and 

 sparse, humeral and lateral bristles stronger ; notum provided with four rather 

 broad slaty-brown vittte ; scutellum with four short bristles; pectus with a few 

 white hairs; metapleurse with a fine bunch of white hairs. Abdomen depressed, 

 cinereous-dusted, the basal segments provided with sparse white hairs laterally ; 

 the seventh dorsal segment strongly convex, almost hemispherical, the eighth 

 minute, together with the small hypopygium hidden within the large tubular 

 testaceous eighth ventral segment, which is produced at its upper basal angles 

 into two stout cylindrical processes articulating with suitable callosities on the 

 sixth dorsal. Coxte rufous, but overlaid with cinereous dust, provided outwardly 

 with a few short bristles, those of the base of the front ones whitish, the others 

 black. Legs rather shining, testaceous, their bristles small, the outer ends of the 

 tarsal joints somewhat more dusky ; tarsal joints evenly decreasing in length, 

 the front and middle tarsi cylindrical, the hind metatarsi and hind tibife as thick 



