THE CANADIAN ENTOMOLOGIST. 19J 



CANADIAN HYMENOPTERA— No. 4. 



BY W. HAGUE HARRINGTON, F. R. S. C, OTTAWA. 



My last paper dealt chiefly with Ottawa sawflies, and in the present 

 article I venture to describe a few Western species which have been for 

 some time in my collection, and which seen to be unnamed. Synoptic 

 tables are added as an aid to collectors of these insects. 



MONOPHADNUS ATRATUS, 71. Sp. 



Male — Length, 6 mm.; black, polished; head wider than thorax, eyes 

 prominent; antennae short and stout, third joint nearly twice as long as 

 fourth, four to nine sub-equal. Apex of femora and remainder of legs 

 pale. Wings slightly infumated, marginal cross-nervure straight, re- 

 ceived in third submarginal cell beyond the middle, second recurrent 

 nervure received about one-fourth from base of same cell, an opaque dot 

 in second. 



Described from one specimen received from the Rev. G. \N . Taylor, 

 Victoria, Vancouver Island. Allied to M. nigreihts, Cress., but in that 

 species the third and fourth joints of antennae are about equal in length, 

 and the marginal cross-nervure coincides with the apical nervure of third 

 submarginal cell. i 



The following table may aid in separating some of the species of this 

 genus, but the descriptions of many of the black forms do not give any 

 characters sufficiently distinctive to make the determination of specimens 

 satisfactory. Probably a critical comparison of the types would reduce 

 the number. 



MoNOPHADNUs, Hartig. 



Ochraceous or luteous. 



Head castaneous, also pleura and mesothorax. . . dilutus. Cress. 



Head black, mouth-parts pale margi?iicoIlis, Nort, 



Head black, mouth-parts and orbits pale Riley i. Cress. 



Dull rufous or chestnut (and black). 



Segments of abdomen darker at apex in(Equide?is, Nort. 



(6) Segments of abdomen with pale line at apex. ./i?ieaius, Kirby. 

 Black, thorax partly rufous. 



Legs black bardus, Say. 



Legs white caryce, Nort. 



Black, thorax black. 



Abdomen partly rufo-testaceous rnbi, Harris. 



var. /mdsonicus, Kirby 



