354 A. L. MELANDER. 



typical, but the female departs from Mr. Coquillett's type. In this 

 specimeu the hirsuteness of the body is much reduced, on the face 

 almost completely disappearing, and elsewhere shorter and sparser 

 than in the male. The chsetotaxy of the coxae is similar for both 

 sexes. Both also have a series of short black bristles on the under- 

 side of the middle and hind femora. The structure of the hyjmpy- 

 gium, as well as the whole habitus, suggests the group obesa of 

 Empis, which, in consideration of the nearly glabrous face, renders 

 the validity of Mr. Coquillett's genus somewhat precarious. 



Page 332. Iteapliila orcUestris sp. nov. 



Male and Female. Length 5 mm. — Deep opaque black over all, the thorax of 

 the female with dark brown dust, rather hairy species. Eyes of the male con- 

 tiguous on the front, of the female very widely separated. Anteurse equalling 

 the height of the head, first two joints moderately large, barrel-shaped, with but 

 few hairs, third joint twice as long as basal two, elongate-lanceolate, not much 

 tapering, blunt, its short arista two-jointed, the first joint thick, the second 

 minute. Proboscis about as long as the head-head, extending straight forward, 

 stouter than in peregrina, palpi slender, equalling the proboscis in length, and 

 applied to it, provided with numerous black hairs. Face bare, occiput covered 

 with dense black pubescence. Thorax moderately pubescent, the hairs sparser 

 and longer posteriorly, the pubescence wanting on two vittse of piceous color, 

 scutellum with a fringe of about twenty long hairs; abdomen moderately pubes- 

 cent basally. The vestiture of the female is much reduced, and not of such a 

 deep black color. Genitalia of the male small, consisting of several projecting 

 filamentous appendages. Legs slender, the knees sometimes brownish, the 

 femora of the male with regular sparse black cilia above and below. Halteres 

 black, the pedicels yellowish in the female. Wings of the male rather pointed, 

 very lightly infumated, stigma elongate, narrow, smoky, veins black, third vein 

 furcate quite a distance beyond the tip of the marginal cell, the submarginal cell 

 therefore small ; of the female, the wings are hyaline, the veins dark fuscous, 

 becoming yellow at the base, the apex is blunter, while the third vein is furcate 

 just beyond tbe end of the marginal cell, stigma faint. 



Described from numerous specimens taken by Mr. H. L. Viereck, 

 June 28, 1902, near the top of the Las Vegas Range, New Mexico, 

 at an altitude of 11,000 feet. The species differs apparently from 

 macquarti in that the veins are not at all bordered with brown, and 

 the third antennal joint is not oval. From peregrina it can be 

 readily distinguished by the hirsute body and shortened proboscis. 



These flies were swarming over a small creek- bed in an ansemo- 

 tropic dance so characteristic of many of the members of this sub- 

 family. 



