308 THE CANADIAN ENTOMOLOGIST. 



Elytra with black spots either side of the apex. Length 3.5-4 mm; 

 width I mm. 



Vertex roundingly rectangular, the margins obtusely rounding, apex 

 subconical, length and width about equal, shorter than the pronotum ; 

 pronotum twice wider than long, broadly produced between the eyes, 

 posterior margin nearly straight ; elytra equalling the abdomen in the 

 female, slightly longer in the male ; venation as in the female of auraius, 

 the second cross nervure seldom present. 



Colour : female pale lemon yellow, the eyes deep green or fuscous, 

 a spot in the second apical and another in the anal cell, and sometimes 

 a line around the apex fuscous; male greenish yello^v, the face and vertex 

 sometimes orange, eyes and a spot in each apical cell fuscous, those in 

 the third and fourth coalescing into a line on the margm. 



Genitalia: female; ultimate ventral segment equalling the penulti- 

 mate, the lateral angles somewhat produced, between which the posterior 

 margin is nearly truncate, a large median triangular notch, either side of 

 which there is a black spot. Male : valve long, the apex rounding, plates as 

 broad at the base as the ultimate segment, regularly narrowing to one- 

 half that width at their truncate apices, width at base and length about 

 equal, margins reflexed and armed with stout hairs, a fuscous spot on the 

 tip of each plate and a small black one before it. 



Described from twenty-five specimens taken from Carex, Ft. Collins, 

 Colo. 



Deltocephalus castoreiis n. sp. 



Short compact, with a short conical vertex. Black, with light mark- 

 ings on vertex and three subhyaline light bands on elytra. Length 2.5 

 mm ; width i mm. 



Vertex conical, obtusely angulate, equalling the pronotum, its basal 

 width one-third greater than its length on middle, anterior margin round- 

 ingly narrowing to the broad convex front, which is roundingly narrowing 

 below to the broad parallel margined clypeus ; clypeus two-thirds the 

 length of the front ; elytra broad, evenly rounded behind, with a broad, 

 short appendix, covering the abdomen in the male, a little shorter in the 

 female ; venation obscure except on the hyaline areas, clavus not retic- 

 ulated, central anteapical cell short, not divided. 



Colour: vertex shining black, a small circle around tip, connected 

 with the ocelli by a slender line, and a broad irregular mark at base light 

 yellow : pronotum black, with a tri-lobate yellow mark along the posterior 



