THE CANADIAN ENTOMOLOGIST. 309 



margin ; scutellum black ; elytra shining black with an indistinct light 

 band extending from the point of the scutellum obliquely across the first 

 cross-nervure of corium, another band from the apex of clavus transversely 

 across the second cross-nervure,and a third along the apical margin ; below 

 shining black, the margins of the gense and the spines on the posterior 

 tibiae orange. 



Genitalia : female, ultimate ventral segment half longer than penulti- 

 mate, posterior margin rounding, slightly excavated, with a small median 

 tooth ; male valve broad, triangular, the margins membranous except at 

 the tip ; plates as broad as the ultimate segment, slightly convexly 

 narrowing two-thirds their length, then curved slightly upwards and ex- 

 tending into a broad finger, the whole three times the length of the 

 valve, equalling the pygofers. 



Described from one male and one female from the head waters of the 

 Little Beaver (9,500 ft. alt.), Larimer Co., Colo. 

 Deltocephalus sattir, n. sp. 



Resembling compactus, smaller, scarcely larger than bla?idus, with a 

 shorter vertex. Olive brown with light and fuscous markings. Length : 

 ^ 2.5 mm., $ 2 mm.; width i mm. 



Macropterous form : vertex convex, sloping, narrowing posteriorly, 

 where it equalls the middle length, slightly shorter than pronotum, 

 slightly obtusely angulate, the apex produced, conical ; face convex, 

 front large, lateral margins rounding, clypeus long and prominent ; 

 elytra slightly longer than abdomen in both sexes ; venation similar 

 to compactus, inner claval vein approaching the outer and connected 

 by two cross-nervures, outer margin of clavus irregularly reticulated, 

 central anteapical cell divided, the dividing nervure being beyond the 

 apex of clavus. Brachypterous form : elytra short, obliquely truncate, ex- 

 posing the ultimate and most of the penultimate dorsal segments, apical 

 cells minute, posterior pait of central anteapical minute or wanting. 



Colour : vertex olive brownish, a light band between the ocelli, 

 another along the anterior margin, these coalescing, omitting a trian- 

 gular spot either side the apex and a fuscous one inside the ocellus 

 on either side, an oblique fuscous dash on either side near the base ; 

 pronotum olive brown with a submarginal row of fuscous spots and 

 subobsolete light stripes ; elytra subhyaline, the nervures broadly light, 

 irregularly, narrowly margined with fuscous, a spot on the centre of 

 costa, the inner anteapical cell and the second apical, fuscous or black. 



