552 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



SCHISTOSTEPHANA AURIFRONS, new species. 



Length, 12 mm. Two males, Rio Charape, Peru, 4,500 feet, Sep- 

 tember 15, 1911 (C. H. T. Townsend). 



Blackish, cinereous pollinose. Face golden. Front dull silvery. 

 Frontalia deep soft brown. Antennae blackish, first two joints dark 

 rufous. Palpi light rufous. Thorax and scutelliun silvery, former 

 with three heavy complete equal black vittae, disk of scutellum black. 

 Abdomen blackish, more than posterior half of anal segment rufous ; 

 dark parts thinly to thickly silvery, intensity changing with point 

 of view. Wings clear. Tegulae pale glassy-fuscous. 



Type.— C&t. No. 22231, U.S.N.M. 



OPSOTHERESIA, new genus. 



Genotype. — OpsotJieresia ohesa, new species. 



General Theresiine characters. Strong, high facial carina. Epis- 

 toma moderately long, warped some from profile of carina. Facialia 

 bare. Haustellum fully two-thirds head height. Palpi rather long 

 and slender, a little thickened at extreme tip. Third antennal joint 

 little over twice second. Arista short-plumose. Eyes bare, Male 

 vertex less than one-fifth head width, the front narrowing therefrom 

 slightly. Ocellars strong. Parafacialia wider than clypeus, equi- 

 lateral, bare. Cheeks nearly half eye length. Three postintraalars 

 and lateral scutellars; four sternopleurals and postsuturals ; one 

 preacrostichal and postacrostichal ; long decussate apical scutellar 

 pair. Third vein bristled only at base, others bare. Apical cell 

 open well before tip. Hind crossvein nearer to cubitus, Male claws 

 long. No median marginals on first two segments, marginal row on 

 last two. Hind tibiae thickly short-ciliate. 



OPSOTHERESIA OBESA, new species. 



Length, 13 mm. One male, Plummers Island, Maryland, June 15, 

 1908 (W, L, McAtee). 



Blackish or dark brown, more or less shining. Palpi fulvous. 

 Antennae reddish-orange, second joint tinged with brown. Frontalia 

 soft dark brown. Rest of head silvery, the cheek grooves showing 

 brownish-red in direct view. Thorax black, thinly silvery ; leaving 

 five black vittae, the outer heavy, the median not so wide, these 

 three extending to base of scutellum; the other vittae are narrow, 

 approximated to the median one, and give out a little behind suture. 

 Scutellum testaceous, the extreme base blackish. Abdomen brown, 

 largely shaded with rufous especially posteriorly, thinly silvery 

 pollinose like the scutellum. Wings clear. Tegulae white. 



Type.— Csit. No. 22262, U.S.N.M. 



