170 THE CANADIAN ENTOMOLOGIST. 



pronotum shorter, its hind edge nearly straight. Colour and markings 

 about as in that species. Length, 6 mm. 



Head broad and short; vertex short, fore and hind margins parallel, 

 but feebly arquated, width between the eyes three times the length, disc 

 obscurely longitudinally rugose ; face coarsely punctured ; front moder- 

 ately convex, its length and breadth subequal ; clypeus oblong, sides 

 straight, at apex slightly contracted ; base feebly convex ; lorte broad, 

 rounded ; outer edges of the cheeks scarcely angled below the eyes, 

 apically margining the lorte and attaining the tip of the clypeus. Prono- 

 tum as long as the scutellum, broad anterior margin calloused, behind 

 which is an arquated impressed line, hind edge feebly concave or almost 

 straight. Elytra usually subhyaline, sometimes more or less infuscated 

 toward the inner margin, nervures distinct. 



Genital characters. Male : Valve slightly longer than the last ventral 

 segment, broad, its apex rounded ; plates broad, nearly square across 

 their apex, outer angles rounded, inner edges contiguous nearly to their 

 apex, a little shorter than the valve. Female : ultimate ventral segment 

 a little longer than the penultimate, apical margin nearly straight, with a 

 broad subtriangular central notch, not reaching the middle of the segment, 

 extreme outer corners oblique ; pygofers as in striola. 



Colour yellow, pale on the face, pectus, legs, and disc of the prono- 

 tum. Front black, apex, median line and about six arcs on each side 

 yellow ; temples black marked with a yellow spot. Eyes, second joint 

 of the antennae, sutures of the face, median line of the clypeus, and front 

 of the vertex black ; ocelli fulvous, connected by a yellow band ; posterior 

 disc of the pronotum sometimes obscured. Elytra pale yellowish, inner 

 and apical areoles sometimes smoky, nervures pale. Wings whitish hya- 

 line, sometimes smoky toward their tips, nervures concolorous. Abdomen 

 black ; connexivum broadly, the genital and penultimate, and the margins 

 of the ultimate segments, and sometimes the sides of the venter, yellow ; 

 sheath of the ovipositor black. In dark examples the outer surfaces of 

 the femora are trilineate with black, and there is a black line on the edge 

 of the anterior and intermediate tibiae ; tips of the tibiae and tarsal joints 

 embrowned. 



Described from one male and seven female examples, all taken near 

 South Falls, on the Muskoka River, Ont., about the hrst of August. 

 This is the large form of A. striola mentioned in my list of Muskoka 



