E. T. CRESSON, JR. 281 



hind margin parallel ; first vein bristly the entire length of stigma; 

 auxilary vein distinct; stigma nearly as long as costal cell; third 

 vein straight, parallel with fourth vein ; last section of fourth vein 

 twice as long as the preceding section ; cross veins straight and per- 

 pendicular, the small cross-vein beyond the middle of the discal cell, 

 but before the end of the first vein ; anal cell not acute; wing hya- 

 line, excepting the dark stigma and a spot at the apex of the sub- 

 marginal cell. 



This genus seems to be a transition between the groups Cephaliinse 

 and Ortalinte. From the former it is excluded by the small pro- 

 boscis and the small clypeus and the presence of propleural bristle ; 

 from the latter by its large mouth, and as that seems to be the only dis- 

 tinct difference, I include this genus in the group Ortalinse. Tephro- 

 nota seems to be its closest relative, but differs mainly by its long 

 head, round eyes, and the mouth being distinctly drawn up in front. 



Hiatus fulvipes sp. uov. (PI. VI, figs. 1, 2, 3. 4). 



In general black or brownish. Front light yellow at base of antennae to 

 brown at the vertex, but the ocellar region and sides of vertex black, whitish 

 pollinose, excepting a middle vitta; two frontal besides the usual vertical bris- 

 tles, otherwise covered with scattered minute hairs. Face white below, to light 

 yellow above, with some brown under the anteunse, pollinose only on the narrow 

 sides. Cheeks whitish, to blackish towards the occiput, which is brownish black 

 and sparingly pollinose. Few bristles on the posterior portion of the oral 

 margin, and a few very minute bristles on the posterior extension of the facial 

 ridge which runs nearly to the occiput. Eyes dark brown. Antennae of male 

 brown, lighter at base, nearly as long as face; third joint four to five times as 

 long as second, and as wide as long. Arista black, except the swollen base ; the 

 antepenultimate joint brown, longer than thick. Antenna:' of female shorter and 

 darker, arista darker and the third joint about one and one-half times as wide 

 as long. Palpi yellow, nearly filiform. Proboscis brown. 



Tliorax black, evenly pollinose above; pleurae brownish, more shining; the 

 usual lateral bristles well developed, but those of the dorsum weak, 3 pair dorso- 

 centrals, no acrosticals. Metanotum black, slightly pollinose. Scutellum flat, 

 black, pollinose, with four bristles. Squamula; small, brownish. Halteres 

 brownish. 



Abdomen shining brownish black. Ovipositor black, first section half again as 

 long as the fifth abdominal segment. Legs in general yellow; fore coxae whit- 

 ish, hind femora of % very much enlarged and darker, knees brown ; of 9 

 scarcely enlarged, not distinctly darker ; the largest bristles are on the fore 

 femora, and one lateral extensor on the hind femora, otherwise the legs are 

 covered with minute hair-like bristles. 



Wings hyaline, but with stigma, and a spot at end of second vein, brown ; sec- 

 ond vein straight; small cross-vein beyond middle of discal cell ; all veins whit- 

 ish or semi-hyaline towards base of wing. Length 9, over all, 5 mm. ; % 3 mm. 



Alamogordo, N. Mex. One % , one 9 . Type in Acad. Nat. Sci. 

 Phila. collection. 



TKANS. AM. ENT. SOC. XXXII. (36) OCTOBER. 1906. 



