122 INSECUTOR INSCITI^ MENSTRUUS 



Thorax. Dorsum, brownish dark. Shades of a median 

 stripe and through the roots of the dorso-centrals darker, 

 sparingly hairy, short. ScuteUum brownish. 



Pleura. Gray black, propleura one bristle, mesopleura bare, 

 except four hairs below the disk. Pteropleura bare. Sterno- 

 pleura one bristle, a few hairs along the top edge, center bare 

 and many bristles between the coxae. 



Abdomen. Dark drab brown, sparingly hairy with apical 

 bristles on segments 3 to 5. Hypopygium color of abdomen, 

 outer claspers a plain L, the stem pointed toward the head. 



Legs. Black or dark brown ; wings hyaline, veins dark. 

 Humeral bristle present. 



Female similar to the male. 



Described from one male, 4th March. Holotype, allotype 

 and paratypes, three females, taken on 8th, 24th, and 30th 

 March. 



All from Cranbrook, British Columbia. 



Leria tristissima, new species. 



Fronto-orbital bristles equal. Three pairs of short pro- 

 sternals ; four dorso-centrals ; one humeral. 



Monotype male, length about 3.5 mm. 



Head (blackish) brown, vertex to antennae orange yellow, 

 face and cheeks dark yellow ; antennae one and two red-yellow ; 

 three missing; vibrissae two below with an outer and an inner 

 row of hairs to the lower corner distinctly separated. 



Thorax somewhat polished ; dark brown, sparingly hairy, 

 all bristles very long. Scutellum brown, dark. 



Pleura dark brown ; propleura one bristle ; mesopleura one 

 long strong bristle on the upper hind edge near the middle ; 

 pteropleura bare ; sternopleura one large one smaller bristle, 

 and also two incomplete rows of hairs along the top edge, 

 central bare and two or three rows of bristles between the 

 coxae. 



Abdomen black brown, sparingly hairy, but with apical 

 bristles on each segment. Hypopygium red brown, not ex- 

 tended, but will be mounted later on a slide. 



