THE CANADIAN ENTOMOLOGIST. oU5 



with a shallow median notch. Male valve transverse, the posterior 

 margin but little rounding, slightly longer than the ultimate segment. 



Colour : vertex and face pale yellow, two large angular black 

 spots on the vertex, about their own width from the eyes and almost 

 touching the hind margin ; rest of surface irregularly maculate with large 

 brownish fuscous spots, usually a | air between the black spots and 

 another pair below them, the lateral sutures of front and clypeus 

 from antennas down, including all of apical half of clypeus, except 

 a narrow median line, deep black ; pronotum pale, irregularly marked 

 with brownish fuscous, omitting a median line expanded in front ; 

 scutellum pale, with a pair of black triangles within the lateral angles, 

 and a pair of spots on disc; elytra smoky brown, the nervines and 

 margins back to the apical cells light. 



Described from twenty-four examples from I )olores, Colorado 

 Springs and Fort Collins, Colo.; all from within the mountains. This 

 is a distinct and well marked species, allied to crataegi. but at once 

 distinguished by the more complex venation and large number of 

 spots, as well as the black "Y" of the face. 



Idiocerus formosus, n. sp. 



Smaller and narrower than lachrymalis, resembling the European 

 populi in size and form, but more heavily marked. Length : 9,6 mm.; 

 0^,5.25 mm. Width, i.N mm. 



Vertex long, but little curved ; face almost flat, front broad below, 

 but not expanded as much as usual at the antennae ; elytra] nervines non 

 tuberculate, outer apical nervure curving away to costa without forming an 

 anteapical cell, or, at most, a short triangular one. Female segment short, 

 transverse, the middle third produced into a rounded lobe nearly twice as 

 long as the rest of the segment ; pygofers moderately long, much inflated, 

 exceeded by the ovipositor by about twice its width. Male valve Insinuate; 

 antennal discs large, about twice longer than wide. 



Colour : vertex and face pale greenish yellow, a pair of round black 

 spots on the vertex and a pair of elongate spots against the eye, both pairs 

 of spots connected on their lower margins by a transverse black band ; 

 another pair of black spots within and beneath the ocelli, on the front. 

 The black band and spots on the front are sometimes absent in the male. 

 Pronotum grayish or greenish, with irregular fuscous markings on the 

 anterior third ; scutellum pale yellow or greenish, usually with the basal 

 angles and a pair of round spots on disc fuscous ; elytra varying from 



