THE CANADIAN ENTOMOLOGIST, 145 



head large and broad ; front and vertex dull and rough ; face covered 

 with hair ; mandibles dark ; antennae dark, flagellum with a ferruginous 

 streak at base beneath ; palpi dark ; tongue rather short, dagger-shaped ; 

 mesothorax shining, with strong and mostly well separated punctures ; 

 scutellum prominent but not bigibbous, very shiny, with sparse punctures; 

 area of metathorax plicate basally ; tegulae of ordinary size, rufo- 

 piceous ; wings strongly infuscated in the apical field, iridescent, nervures 

 and stigma piceous ; second s. m. nearly square, but a little oblique, 

 receiving the first r. n. at or very slightly beyond its middle; third 

 s. m, large, scarcely shorter than first ; legs black, slender, tarsi brown, 

 the hind ones quite pallid ; hind legs not modified ; abdomen shining, 

 finely punctured, hind margins of segments depressed and with thin 

 hair-bands ; most of fourth ventral segment depressed and covered with 

 hair. 



Hab. — Ekuiva Valley, W. Africa, 1907 ( Wellman), N. produda, 

 Smith, from Natal, and N. andrei^ Vachal, from the French Congo, also 

 have a claviform abdomen. The following table separates the males : 



Clypeus greatly produced ; first r. n. joining second t. c . . .producta, Sm.* 



Clypeus normal i. 



I. Head and mesothorax sculptured alike midrei^ Vach. 



Head and mesothorax sculptured quite differently .... ekiiive?isis, Ckll. 



No mi a Welwiischi, sp. no v. 

 ^ , 9 • — Length about 10 mm., black, the head and thorax with dense, 

 coarse pubescence, strongly ochreous on thorax above, otherwise pallid ; 

 wings strongly and broadly infuscated apically; hind margins of abdominal 

 segments broadly whitish or reddish, with hair-bands. 



^ . — Head broad ; orbits converging below ; face broad, very hairy ; 

 antennae dark, ordinary, flagellum dull red beneath ; vertex with rough, 

 dense sculpture ; mesothorax very densely rugosopunctale ; scutellum 

 normal, rugosopunctate and dull ; metathorax with a subbasal ridge, 

 above which is a narrow (almost linear) area, which is shining and some- 

 what plicatulate ; tegulae ordinary, piceous, pallid in front ; wings reddish 



*Since writini^ the above, I have determined that Nornta producfa, Smith 

 (Tr. Ent. Soc. Lond., 1875), is not a Xomia at all, but a Thrinchostoma. For the 

 venational characters, see Ckll., Trans. Amer. Ent. Soc, XXXI, p. 322. The 

 name pfoducfa was earlier used for a different Thrinchostoma, so the Nomia pro- 

 ducta, Sm., may be known as TJirinchostoma noviicefonnis, n. n. 



