50.1124. REVISIoy OF THE MELASnPLl^SCrhDKH. 379 



rounded, ferrnpneo testaceous in the basal lalf, beyond Rubhyallne 

 with t'nsco-testaceous veins an<l cross veins ( /*. n. voln(riH, IMate I, li^'. <•); 

 wi'ijfs in the latter f'orin about as lon^j as the tegniiim, moderately 

 broa<l, hyaline with fnsco olivaceous or fusco-ferrujrinoua veins beeom 

 ing increasingly infuseatecl ai)iciilly. Fore and middle femora a little 

 tumid in the male; hind femora tlavo-testace<ms, generally more 

 or less infuscated or fusco olivaceous in the npi>er half of the outer 

 face, the inner side an<l outer carimi of the upper face and upper 

 limit of the inner face more or less distinctly and rather narrowly 

 bifasciate or bimaculate with fuscous; lower face tiavous sometimes 

 deepening into roseate; upper genicular lobe an<l base of lower geidc- 

 ular lobe blackish fuscous; hind tibiae usually glaucous, sometimes 

 lighter, sometimes darker, occasionally yellowish, with a subbasal black- 

 ish annulus and the ai)ex fuscescent or tlavescent, the spines black 

 almost or ipiite to the base, twelve to thirteen, rarely eleven, in number 

 in the outer series. Extremity of male abdomen feebly clavate, a little 

 recurved, the supraanal plate triangidar with slightly convex sides and 

 f«'ebly acutangulate apex, the median sulcus rather bread and e<pial, 

 reaching only the middle of the plate and there fading abruptly, the 

 moflerately high walls terminating against a feebly transverse plica; 

 furcula consisting of a pair of very slender and brief needles overlying 

 the submedian ridges of the supraanal jdate, not nearly so long as the 

 last dorsal segment; cerci compressed aubstyliform, moderately broad 

 at base, tapering more rapidly in the basal than in the aiucal half, 

 bluntly acuminate at tip and about as long as the supraanal plate; 

 subgenital plate narrow and apically narrowing slightly, the lateral 

 and apical margins in about the same plane, the apical margin laterally 

 compressed mesially, so as to simulate an apical tubercle, entire. 



Measurements : P. n. nebrascensis (Colorado). — Length of bcwly, male, 

 22 ram., female, 23 mm.; antennae, male, 9.5 mm., female, 7 mm.; teg- 

 mina, male, 6 mm., female, 6.5 mm.; hind femora, male, female, 11.75 

 mm. (Texas), body, male, 22.5 mm., female, 30 mm.; antennae, male, 

 female, 11 mm.; tegmina, male, G mm., female, 7.5 mm.; hind femora, 

 male, 13 mm., female, 15.25 mm. P. n. volucris (male, Nebraska; female, 

 Montana), body, male, 23 mm., female, 24 mm.; antennae, male, 9 mm., 

 female, 7.25 mm., tegmina, male, 18.5 mm., female, 18 mm.; hind 

 femora, male, 11.2 mm., female, 12.5 mm. (Texas), body, male, 21 mm., 

 female, 28.5 mm.; antennae, male, 10.5 mm., feu-ale, 9 mm.; tegmina, 

 male, 18.25 mm., female, 20 mm.; hind femora, male, 13.5 mm., female, 

 15 mm 



Twenty-seven males, 28 females. Medicine Hat, Assiniboia, Septem- 

 ber (U.S.X.M. — Kiley collection); Fort McLeod, Alberta, September 

 (same); Glendive, Dawson County, Montana (L. Bruner); Wyoming, 

 Morrison (U.S.N.M. — liiley collection); Nebraska, Dodge, Octf)ber 

 (same; S. Henshaw; S. H. Scudder); Gordon, Sheridan County, 

 Nebraska, September (U.S.N.M. — Eiley collection); Fort Kobinson, 



