228 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



hind femora luteo- or ferrugineo-testaceous, very obliquely and broadly 

 bifasciate with blackish fuscous above and outside, with a basal patch 

 of the same, the whole sometimes reduced to mere clouds, the genicu- 

 lar arc and sometimes the whole geniculation blackish fuscous ; hind 

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

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

 vate, upturned, tbe supraaual plate small, subclypeate, much longer 

 than broad, the lateral margins elevated a little and broadly on the 

 basal half, the apex subrectangulate, a little rounded, the median 

 sulcus not deep, percurrent, with sharp but low bounding walls in the 

 basal half 5 furcula consisting of a pair of subparallel, slender, tapering, 

 acuminate, flattened fingers, seated on rather tumid bases (forming 

 part of the last dorsal segment), lying outside the ridges of the supra- 

 anal plate, and extending about halfway across it; cerci small feebly 

 falciform lamellae, tapering on the basal half only and well rounded at 

 tip, gently incurved and almost as long as the supraanal plate; infra- 

 cereal plates large, scarcely longer than the supiaanal plate, almost 

 completely concealed by the recumbent cerci; subgenital plate small, 

 broad but longer than broad, subpyramidal, being apically compressed, 

 the apical margin slightly elevated and subtubercular, entire. 



Length of body (M. cl. telhistris), male, 16 mm., female, 18.5 mm.; 

 antennae, male, 7.5 mm., female, 6.25 mm.; tegmina, male and female, 

 5.25 mm. ; hind femora, male, 9 mm., female, 10.5 mm. Length of body 

 (N. d. completus), male, 14.5 mm., female, 17.5 mm.; antennae, male, 7 

 inm., female, 6 mm. (est.) ; tegmina, male, 15 mm., female, 16 mm. ; hind 

 femora, male, 8.75 mm., female, 10 mm. 



Thirty-four males, 42 females. Fort McLeod, Alberta, Canada, 

 August (L.Bruner; U.S.N.M. Riley collection); Souris Kiver, Assini- 

 boia, G. M. Dawson; Montana (U.S.N.M. Riley collection); Dakota 

 (same; S. H. Scudder); Clifford, Traill County, North Dakota (L. 

 Bruner); Custer, Black Hills, South Dakota, Bruner (U.S.N.M. Riley 

 collection); Wyoming, Morrison (same); St. Paul, Minnesota, August 

 27, Whitman (same); Red River, Manitoba, R. Kennicott; Dallas 

 County, Iowa, August, J. A. Allen; Jefferson, Greene County, Iowa, 

 July 20-24, Allen; Crawford County, and Denison, Crawford County, 

 Iowa, July 10-24, Allen ; Nebraska, Dodge (U.S.N.M. Riley collection ; 

 S. Henshaw; S. H. Scudder); Lincoln, Lancaster County, Nebraska, 

 September (L. Bruner); Fort Robinson, Dawes County, Nebraska, 

 August 21, Bruner (U.S.N.M. Riley collection); Colorado, Morrison 

 (same; S. H. Scudder); Northern New Mexico, Lieutenant Carpenter 



Allen found the species in Iowa in grass on prairies. 



There are two very distinct forms of this species, differing however 

 only in the length of the organs of flight, the tegmina being abbreviated 

 and subacuminate at tip in the form M. d. tellustris (retaining the 

 second oldest name for the form incapable of flight), and fully developed, 

 broad and ample, greatly surpassing the hind femora and well rounded 



