334 PROCEEDING S OF THE X. i TIOXA L M USE UM. vol. xx. 



tical lateral lobes by a distinct but rounded shoulder, sometimes form- 

 ing feeble blunt lateral carinae, especially on the nietazona; median 

 carina distinct and sharp on the nietazona, less distinct and in the 

 female sometimes subobsolete on the prozona; front marjjin truncate, 

 hind niarjjin bluntly obtusangulate; prozona transverse, rarely quad- 

 rate or subquadrate, slightly longer in the male than in the female, at 

 least a fourth (male) or scarcely (female) longer than the finely but 

 obscurely punctate nietazona. Prosternal spine short, very blunt con 

 ical, erect or suberect, feebly (male) or strongly (female) appressed; 

 interspace between mesosternal lobes fully twice as long as broad 

 (male) or quadrate (female). Tegmina reaching, rarely suri)assing, the 

 tips of the hind femora, of normal width and form, brownish fuscous, 

 distinctly but not heavily maculate along the discoidal area, rather 

 more distinctly in the female than in the male; wings moderately 

 broad, hyaline, the veins j)ale fuscous, deepening apically and ante- 

 riorly. Fore and middle femora very little tumid in the male; hind 

 femora of normal length, above and within bimaculate with fuscous, 

 which is ordinarily contined in extent, but when extended takes on the 

 form of very oblique fasciations, developed more on the inner than on 

 the outer face, the latter luteo testaceous more or less infuscated espe- 

 cially along the upper margin, beneath and on lower half of inner face 

 luteous or tiavous,the genicular arc fuscous; hind tibiae variable, red, 

 yellow, or green, but always pale and rather dull in tint, the spines 

 black beyond the base, ten to twelve, usually eleven, in number in the 

 outer series. Extremity of male abdomen clavate, recurved, the supra- 

 anal })late triangular, the apex acutangulate, the surfiice nearly plane, 

 with a shallow median sulcus on the basal three-fourths, formed by 

 I)arallel and at last united, not very high, rounded, bounding ridges; 

 furcula consisting of a pair of approximate, feeble, triangular denticu- 

 lations overlying these ridges; cerci gently arcuate inward, consisting 

 of a stout, tumid, very rapidly narrowing basal i)ortion, a short, sub- 

 cylindrical, median stem, and an apical furcation which develops two 

 flanges: an ui)per, inward directed brief finger, hardly longer than 

 broad and blunt tipped; and a long, downcurved, tapering, pointed 

 apophysis, angulate on its upper margin and reaching far beyond the 

 supraimal i)late to the base of the apical elevation of the subgenital 

 plate ; the latter moderately broad and equal except for the extreme 

 and abrupt apical elevation of the margin, forming, as viewed from 

 behind, a quadrate truncate plate, mesially appressed, rising above 

 the lateral margins of the i)late. 



Length of body, male, 22 mm., female, 24 mm.; antennae, male, 7.5 

 mm., female, 0.25 mm. ; tegmina, male and female, 16 mm.; hind femora, 

 male, 10.5 mm., female, 13 mm. 



Thirteen males, 11 females. British Columbia, Crotch (Museum 

 Comparative Zoology); Fort McLeod, Alberta, August, L. Bruner 



