36 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



advisable to retain it in a distinct tribe, coming before the Scio- 

 myzini. On the other hand it has much that suggests the Sepe- 

 dontini, but can not very well be placed in the Euthycerinae. 

 There being but one genus known to belong here, it is hardly 

 possible to give any positive tribal characters, especially as the 

 status of the Sciomyzini also is not well established. However, 

 the tumor-like structure of the face and the elongate antennae, 

 with tiieir white arista, are very noticeable characters which, how- 

 ever, may not be confined to the present genus. 



OIDEMATOPS new genus 



This genus is seemingly allied to Sciomyza sens, strict, in pos- 

 sessing two preapical bristles on the fore tibiae, and in the pro- 

 truding epistoma; but simulating Sepedon and its allies in general 

 appearance and antennal structure. Further generic characters 

 may be gleaned from the full descriptions of the genotype below. 

 Oidematops ferruginea new species 



cT, 9. Shining, tawny to brown; bases of third antennal joint, arista, 

 palpi, halteres, base of wings, and legs, paler. Apical two-thirds of third 

 antennal joint, velvety spot on upper praefacialia, first four joints of fore 

 tarsi of male, apices of fore tibiae, and fore tarsi, except apically in female, 

 black. Wings hyaline with brown tinge; costa apically, apical half of second, 

 and all of third to fifth, veins, broadly clouded. 



Head broader than high; eyes round or vertically oval; occiput convex, 

 with vertical margin obliterated. Frons broad, depressed on its full width, 

 projecting at antennae, without distinctly defined areas, bare; tubercle re- 

 moved from vertex, with bristles well developed; two f rentals. Lunule not 

 visible. Face broad, in profile deeply emarginated, with a large, rounded, 

 tumor-like swelling above, between the narrow, distinct foveae, which are 

 evident to as far as cheeks; parafacialia broad; median area sharply defined; 

 epistoma strongly protruding. Palpi cylindrical. Antennae elongate, por- 

 rect ; first and second joints subequal, as long as broad, second without bristles; 

 third not broader, slightly narrowed beyond middle, three or four times as 

 long as broad; arista thick basally, densely, short, white plumose. 



Thorax much longer than broad; mesonotum flattened posteriorly, possess- 

 ing one humeral, two notopleurals, one supra-alars, two post-alars, and one 

 dorso-central. Mesopleura bare; propleural bristle present; pteropleura 

 bristly. Scutellum triangular, with four bristles. Abdomen elongate, cylind- 

 rical, not broader than thorax; third and fifth segments subequal; sixth much 

 shorter. Legs simple, slender; fore and hind femora with lateral extensors; 

 fore and middle tibiae each with two preanicals; hind tibiae with one pre- 

 apical. Wings long and narrow; second to fourth veins j^arallcl; small cross- 

 vein beyond middle of discal cell; hind cross-vein straight, j)erpendicular. 

 Length.— 7 to 8 mm. 



