238 THE CANADIAN ENTOMOLOGIST. 



above the antennae to the clypeus is black ; the clypeus is distinctly emar- 

 ginate, and just beyond the middle of the second submarginal cell there 

 is a small fuscous speck. 



Nematus luteolus, Nort. # 



Two males, which I think belong here, have a broad margin to the 

 abdominal segments ; the margin is broadest on the middle segments, 

 almost interruptedly transversely fasciate, the apex of the abdomen and 

 the entire venter honey-yellow. 



Nematus, Sp. 



There are six species in the collection which are probably new ; in the 

 present state of the genus it seems best to leave them undescribed. 

 Messa atra, sp. nov. 



Head, labium, mandibles, antennae, thorax, abdomen, coxae except at 

 apex, and femora at middle, black ; clypeus acutely emarginate, labium 

 broadly rounded ; head and thorax sericeous ; middle mesothoracic lobe 

 with a central groove on its anterior half; abdomen black, apical seg- 

 ment above slightly rufous ; coxae black, at apex fuscous ; femora at base 

 and apex white, with a broad median black band ; anterior and middle 

 tibiae fuscous, darker beneath, hind tibia black, at base white ; spurs 

 fuscous ; anterior and middle tarsi at base fuscous, apex black, hind tarsi 

 black ; wings hyaline, veins piceous, stigma lighter at base. Length, 7 mm. 



1 9, April 14, 1892. Related to salicis, Ashm., but differs by its 

 rounded labium and black abdomen. 



Dolerus borealis, sp. nov. 



Body stout, black, except the two lateral lobes of the mesothorax, which 

 are reddish-brown ; head, thorax and pleurae densely coarsely punctured ; 

 antennae slender, third and fourth joints subequal ; clypeus deeply emar- 

 ginate ; two feeble longitudinal sinuses on the vertex each side of the 

 ocelli ; body densely sericeous, especially around the mouth and on the 

 legs ; inner tooth of claw stout, distinct ; wings slightly fuscous, veins, 

 costa and stigma black. Length, 1 1 mm. 



2 $ ? , May 22, 1892. 



Dolerus sericeus, Say. 



3 $ ? , May 11, June 6, 1892, and April 20, 1893. This last speci- 

 men measures 12 mm., and the wings are clearer than in typical speci- 

 mens, but otherwise I can find no distinguishing character. 



