THE CANADIAN ENTOMOLOGIST 287 



l)ristles hairlike, in onl\- two rows; parafrontals and parafacials 

 thickly covered with long fine hair. Ocellars and the two pro- 

 clinate and two reclinate fronto-orbitals rather hairlike, even the 

 inner verticals but slightly stronger and still quite hairlike. Marginal 

 row of bristles on parafacials same strength as frontals. Face 

 conspicuously wider than front. Parafacials fully as wide as cheeks, 

 hardly at all narrowed below, the parafrontals very conspicuously 

 narrower. Proboscis much shorter, the part below geniculation 

 not as long as third antennal joint. Thorax, pleura\ scutellum, 

 abdomen and femora thickly clothed with fine long hair, all the 

 macrochaetaj comparatively weak, Legs more slender. Claws 

 short. 



This genus is named in honour of Mr. Frederick Knab. 



Knabia hirsuta new^ species. 



Length of body 10.5 to 11 mm.; of wing 8 to 8.5 mm. Two 

 males, Oxbow, Saskatchewan, April 30 and May 13, 1907 (F. Knab). 



Black. Head all yellow, pale gold pollinose, satiny; lateral 

 portions of occiput lead-gray. Palpi and second antennal joint 

 rufous, third joint soft gray-black, arista jet-black. Occipital 

 beard pale gra>ish-golden; cheek, facia^l, frontal and all the other 

 hair black. Thorax with very faint bloom, four linear brownish 

 or blackish vitta^ showing. Scutellum testaceous, broadly black on 

 base. Abdomen rather shining black; segments two to four, 

 narrowly edged on base with silvery-white, broadening on sides of 

 anal segment. Legs black, tibiae often with a brownish tinge. 

 Wings clear except the smoky oblique basocostal area. Tegula; 

 nearly white, margined with pale tawny. 

 . -Holotype, No. 19555 U.S.N. M. 



Family Minthoida: . 



Pseudodidyma new genus. 



Genotype— Psezidodidyma pidlida Townsend, new species. 



Differs from Wulp's description of Didyma as follows: Head 



subquadrilateral, but profile much narrowed below, the face very 



receding. Front prominent, much wider than one eye, about 



same in both sexes. Facialia not ciliate, with only a few bristles 



that reach hardly over one-fourth way up. Facial depression 



