262 A. L. MELANDER. 



Blepharoprocta serratula Loew (Fig. 90). 

 Cent, i, 23. 



Female. — Head black, shining. Face very narrow, white-pollinose. Proboscis 

 yellow. Thorax and scutellum black, shining, pleurte sparsely white-pollinose. 

 Abdomen lengthened, cylindrical, dark dull yellow, base and apes darker; ven- 

 ter luteous; last abdominal segment wiiole, not inflated, the upper and lower 

 parts connate, the posterior margin provided with numerous white hairs. Coxae 

 and legs pale yellow, an anterior spot on the posterior femora, and almost the 

 whole of the hind tarsi badious, last two joints of the tarsi piceous, the preceding 

 joints of the anterior tarsi fuscous, of the middle badious ; posterior femora un- 

 armed, front femora near the tip below with very small spines. Halteres yellow. 

 Wings very narrow towards the base, yellowish ciuerascent, veins strong, yellow- 

 ish fuscous; first submarginal cell closed. 3.3 mm. 



Georgia (Gerhard). 



EMPIDIN^. 



HIL.ARA Meigen. 



Rather large to small species of gray, black, or rarely reddish 

 color. Antennae as long as the head or longer, three-jointed, the 

 third joint fusiform, compressed, with a two-jointed arista. Pro- 

 boscis not longer than the head. Eyes of both sexes separated. 

 Humeri prominent. Legs bare or bristly, the front metatarsi of the 

 male nearly always much thickened. Wings with a forked third 

 vein, the upper branch of which is not per{:>endicular to the re- 

 mainder; discal cell with three veins issuing from its apex; anal 

 cell shorter than the second basal, both bounded by a cross vein 

 almost parallel with the hind margin ; anal angle prominent. 



The following artificial key contains all the species from North 

 America, with the exception of Walker's three. In the collection 

 are representatives of about a half dozen other species, but as most 

 of them are species of poor characterization, it was deemed best to 

 await more material. 



Thorax green Tiridis Coquillett. 



Thorax reddish yellow 2. 



Thorax black or gray 3. 



2. Tarsi wholly brown, pile on inner side of middle tibiaj long. 



testacea Loew. 



Tarsi brown only at apex, elsewhere yellow, pile of inner side of middle 



tibiae short lutea Loew. 



3. Front femora thickened ; stigma weak reinorata Loew. 



Front femora not thickened 4, 



4. Thorax posteriorly with golden pubescence aurata Coquillett. 



Thorax otherwise 5 



5. Antennse reddish at base unibro!«a Loew. 



Antennae black 6, 



