304 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



blackish fuscous, and pallid; wings hyaline, iridescent, the veins 

 brownish fuscous anteriorly and apically. Fore and middle femora but 

 very little tumid in the male; hind femora varying from luteo-testa- 

 ceous to ferruginous, the inner half of the upper face bifasciate with 

 fuscous, which sometimes crosses also the outer half of the same and 

 rarely extends upon the tipper portion of the outer face, and is occa- 

 sionally subobsolete altogether, the lower face and lower half of 

 the outer face nearly always luteous or lutescent, the outer face 

 often streaked with blackish fuscous along its upper margin; hind 

 tibiae bright red, the spines black except at base, ten to thirteen in 

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

 and upturned, the supraanal plate ovate with an apical ovate exten- 

 sion, the sides well rounded and broadly elevated, the apical portion 

 about a fifth of the whole and a miniature of the base, the median sul- 

 cus rather large, with well-rounded walls, per current but interrupted 

 in the depressed zone beyond the middle; furcula consisting of a pair 

 of strongly divergent, arcuate, somewhat depressed but rounded, regu- 

 larly tapering, acuminate fingers, less than a third as long as the 

 supraanal plate; cerci rather small, compressed, incurved plates, 

 gradually constricted in the middle and well rounded apically, the 

 apical half broadly depressed or sulcate exteriorly, not nearly reaching 

 the tip of the supraanal plate; infracercal plates similar to those of 

 M. comptus, but a little less broad and almost as long as the supraanal 

 plate; subgeuital plate forming a regular, well-rounded, hardly flaring 

 scoop, the apical margin very feebly elevated and broadly and faintly 

 notched. 



Length of body, male, 22.5 mm., female, 25 mm.; antennae, male, 9.75 

 mm., female, 8.5 mm.; tegrniua, male, 16.5 mm., female, 17 mm.; hind 

 femora, male, 12.75 mm., female, 13.5 mm. 



Twenty-eight males, 31 females. Sudbury, Ontario, July; Nebraska, 

 Dodge; Sand Hills, Nebraska, July (L. Bruner) ; Fort Eobinson, Dawes 

 County, August 21, Gordon, Sheridan County and Valentine, Cherry 

 County, Nebraska, Bruner (U.S.N.M. Kiley collection); Barbour 

 County, Kansas, Cragin (L, Bruner); Lakin, Kearny County, Kansas, 

 3,000 feet, September 1 ; Colorado, 5,500 feet, Morrison ; Rocky Moun- 

 tains, Colorado, August (University of Kansas); Denver, Colorado, 

 October 5; Beaver Brook, Jefferson County, Colorado, Uhler; Garden 

 of the Gods, El Paso County, Colorado, October 6 ; Manitou, El Paso 

 County, Colorado, August 9; Colorado Springs, El Paso County, Colo- 

 rado, August, E. S. Tucker (University of Kansas); Garland, Costilla 

 County, Colorado, 8,000 feet, August 28-29; Salt Lake, Utah, July 21, 

 Packard. 



Specimens sometimes occur, probably only in sandy stations, in which 

 the insects are of a nearly uniform flavous color, often tinged slightly 

 with ferruginous, giving a very different general appearance from the 

 normal. 



