190 THE CANADIAN ENTOMOLOGIST. 



ing black, with traces of four light arcs, lower haK light lemon-yellow. 



Genitalia : female, ultimate ventral segment resembling abbreviatus, 

 twice longer than penultimate, lateral margins narrowing posteriorly, 

 posterior margin angularly emarginate, a broad wedge-shaped median 

 tooth extending beyond the lateral angles, the apex slightly notched in 

 the middle and arcuated either side ; male, valve broad, triangular, 

 plates narrow convex, half longer than valve ; pygofers longer than ])Iates, 

 compressed ventrally, forming a blade-like structure, for the reception of 

 which the plates are notched half way to the base. 



Described from numerous specimens taken at Fort Collins, Colo., 

 and back into the mountains to the Little Beaver {9,500 feet), also speci- 

 mens from Windsor, Estes Park, Denver and Holly in Colo., and from 

 Western Kansas. The black on the upper half of the face will serve to 

 separate it from all but ?-c/Iexus and the following species, and from these 

 it may be distinguished by the flat pygofers and the notched plates. 



Deltocephalus stvlatus, n. sp. 



Similar in form and colour to flexulosus, but broader, as broad as 

 ifijlatus, with the black on the face and the flaring elytra of rejiexus. 

 Length 4.5 mm., width 1,75 mm. 



Vertex one-third longer than pronotum, little longer than its basal 

 width j width across eyes equal to the combined length of pronotum and 

 vertex; front and clypeus proportionally broader than in flexulosns ; 

 elytra longer than abdomen in most specimens ; venation as in inflatiis^ 

 the basal angle of the third apical cell a right angle, claval nervures 

 separate. 



Colour: pale cinereous, vertex greenish, markings on margin and ti]) 

 as \\\ flextdosus^ a transverse band on either side before eye and a spot in 

 the middle of either side at the base fuscous ; pronotum with a sub- 

 marginal rjw of fuscous spots ; elytra pale, with dark margined nervures 

 and fuscous markings as in flexiilostis. 



Genitalia : female, ultimate ventral segment over two and one-half 

 times as long as penultimate, lateral margins nearly parallel, posterior 

 margin straight, produced on the middle third into an obtusely triangular 

 tooth, which is bifid at the apex and bears a small lateral tooth at about 

 the middle of either side ; male, valve equilaterally triangular, plates 

 narrow, extending beyond the valve scarcely its length, roundingly 

 divergent at the apex, where they are half as wide as at the base, their 

 tips roundingly emarginate, pygofers inflated, extending considerably 



