THE CANADIAN ENTOMOLOGIST. 327 



Strongylogaster rufoculus, n. sp. Head black, clypeus and labrum 

 white, labrum broadly rounded, a prominent rufous spot behind each eye, 

 antenna black, segments six to nine white, the third segment one-third 

 longer than the fifth, sinus at side of ocelli not reaching the back of the 

 head ; thorax black, the tegular rufous ; apex of the abdominal segments 

 slighdy darker, basal plates black ; legs rufous, coxn? black, posterior 

 cox£e slightly marked with yellow, anterior and middle trochanters black, 

 posterior yellow, femora and tibia? rufous, posterior femora slightly 

 marked with black at apex, tarsi yellow ; wings slightly yellowish, veins 

 brown, costa at base of stigma yellow, apex of stigma brown, lanceolate 

 cell with an oblique cross-nervure, posterior wings with two middle cells, 

 outer cells incomplete. Length, 1 1 mm. 



Habitat— Ithaca, N. Y. 3 ? 5^ , June 5-10, 1890. 



Strongylogaster primativus, MacG., should more properly be referred 

 to Tenthredopsis, having the cross-vein of the lanceolate cell perpendicular 

 or wanting, and the third and fourth segments of the antenna? equal. 



BivENA,* gen. nov. 



Wings with three marginal and four submarginal cells, the first 

 marginal cell receiving the two anterior submarginal cross-veins and the 

 second the third, the second and third submarginal cells each receiving a 

 recurrent nervure, lanceolate cell open at the shoulder, subcontracted at 

 middle with a cross-vein near the apex, subcosta wanting, posterior wings 

 with two middle cells, the cross-vein closing the apex of the anterior one 

 runs to the margin of the wing at about one-third the width of the cell, 

 thence follows around the margin of the wing to the vein forming the 

 posterior side of the cell \ antennae nine-jointed, filiform, reaching to 

 about the base of the abdomen, the segments all of the same width, head 

 as wide as the thorax, very slightly dilated behind the eyes ; abdomen 

 about as long as the head and thorax, somewhat widened at middle, 

 ovipositor stout, of the usual type of Macrophya. Type, Bivena maria, 

 sp. nov. 



A very interesting genus, belonging to the subfamily Tenthredin.-e. 

 Easily separated from both the Lydiinpe and Xyliina? by fhe absence of 

 subcosta, from the former by the nine-jointed antennti? and from the latter 

 in not having the ovipositor greatly exserted and the basal segments of 

 the antennae dilated. 



*Bis, twice ; vena, vein. 



