76 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



Melanoplus dawsoni (Scudder). His sapellanus, with data identical 

 to those of cockerelli, was based largely on a male with imperfectly 

 developed genitalia. 



Descriptive notes: A short-winged, flightless subspecies averaging 

 smaller than borealis borealis and with the furculae usually wider than 

 in the latter. Tegmina broadly lanceolate, usually overlapping nar- 

 rowly but sometimes not quite attingent, covering from scarcely more 

 than one-third to slightly more than one-half of abdomen (about Ijz 

 to IK times length of pronotum); wings vestigial. Posterior third of 

 abdomen moderately to considerably recurved dorsally, 



Male genitalia: Cercus (fig. 8,d) proportionately broader than in 

 the other subspecies (distorted by drying in lectotype of stupefactus, 

 fig. 8,d-l) ; furculae usually as in figure 9,d-2, seldom a little more 

 tapering, and sometimes broader (fig. 9,d-l) ; subgenital plate in lateral 

 view with posterior portion of dorsal margin upturned as a lip about 

 to the extent in figure 16,c, not sinuate, posterior margin sometimes 

 more nearly vertical and less oblique than in the figured specimen, in 

 posterior view the dorsal margin variable (fig. 11,6) but usually with 

 at least weakly indicated twin apices. Aedeagus as in borealis borealis; 

 epiphallus with rather deep emargination of anterior margin between 

 ancorae, lophi lanceolate in dorsal view, rather highly elevated and 

 with profile of posterior portions evenly rounded in lateral view (fig. 

 10, d). 



Female genitalia : About as in borealis borealis, the cercus averag- 

 ing more robust (fig. 10, m). 



Coloration: Typically dark for the species; hind tibia and ventral 

 surface of hind femur, reaching slightly onto external paginal area, 

 dark red; dark transverse bands of hind femur visible dorsally, 

 variable on external surface. 



Variation: The size of eight representative males, measured in 

 millimeters, varies in pronotal length from 3.6 to 4.5 (av. 4.0), in 

 length of hind femur from 9.0 to 10.8 (av. 9.7), and in length of tegmen 

 from 4.7 to 7.0 (av. 5.9). Three measured females vary in pronotal 

 length from 4.4 to 4.7 (av. 4.5), in length of hind femur from 11.2 to 

 11.3 (av. 11.3), and in length of tegmen from 6.5 to 7.4 (av. 6.9). 



Hebard (1929, p. 389) reported 29 males, 27 females, and 2 nymphs 

 from Tomboy, Colo., also a nymph from Trout Lake, San Miguel Co., 

 Colo., which he regarded as intermediate between borealis monticola 

 and borealis stupejactus. Specimens from the Tomboy series and a male 

 from White River Forest, Colo., have the tegmina covering about 

 three-fourths of the abdomen, the furculae averaging narrower than in 

 typical borealis stupejactus, the dorsal lip of the apex of the male 

 subgenital plate higher and without twin apices developed. These 

 specimens average larger than borealis stupejactus, and have an average 



