GRASSHOPPERS — GURNEY AND BROOKS 77 



tegminal length of 9.5 mm. in males, 10.8 mm. in females. We regard 

 them as intermediate between b. borealis, b. stupef actus, and b. palaceus. 



Distribution: Hebard's record from Gothic, Colo. (1929), is a 

 northern extension of the distribution (fig. 18) based on specimens 

 examined. 



Specimens of Melanoplus borealis stupefactus have been examined 

 from the following localities : 

 Colorado: Mineral Co.; Silverton, San Juan Co.; Lizard Head; peak north of 



Cumbres, Cumbres Range, Conejos Co.; Los Pinos, Conejos Co.; Cumbres. 

 New Mexico: Taos Peak; Truchas Peak; Beulah; top of range between Sapello 



and Pecos Rivers; Santa Fe Bald}'; head of Nambe Creek, Sangre de Cristo 



Range. 



The following material is intermediate between Melanoplus borealis 



stupefactus, M. b. borealis, and M. b. palaceus: 



Colorado: Tomboj-, Marshall Basin, San Juan Range (about 2 to 3 miles north- 

 east of Telluride; A. B. G.), 11,400 ft., Sept. 2, 1921, Rehn and Hebard (12 cf , 

 15 9); White River Forest, Aug. 1933 (1 cf). 



The male from Trout Lake, San Miguel Co., Colo., collected by 

 Hebard Sept. 4, 1921, at 9,700 feet, and reported by him (1929, p. 

 389) as intermediate between borealis monticola and b. stupefactus has 

 tegmina covering slightly more than one-half of the abdomen. We 

 regard it as 6. stupefactus. 



Biology and economic importance : Most of the known biological 

 data on this grasshopper have been summarized by Hebard (1929, pp. 

 388-389; 1935a, p. 67). It is of no recognized economic importance, 

 and there have been no detailed studies of its bionomics. Distribu- 

 tion is mainly if not entirely in the Arctic Alpine and Hudsonian 

 zones in northern New Mexico and southwestern Colorado. The 

 lowest altitude at which it has been recorded is 8,500 feet at the head 

 of Chupidero Creek, N. Mex., and the highest 12,629 feet at the 

 summit of Santa Fe Baldy, N. Mex, 



Small numbers of specimens have been recorded well above timber 

 line, there occurring in patches of green vegetation, but it has been 

 found abundant on mountain slopes and in mountain meadows of 

 lush grasses and other plants such as marsh marigold (Caltha lepto- 

 sepala Hooker). At each of two localities (Los Pinos, Colo.; head of 

 Chupidero Creek, Sangre de Cristo Range, N. Mex.), Hebard reported 

 more than 50 adult specimens take by himself and Rehn, while on 

 NefF Mountain, Cumbres Range, Colo., he reported their collecting 

 more than 100 adults. Collection dates range from July 24 to Sep- 

 tember 11, and nymphs have been observed throughout July and 

 August. Hebard found about two-thirds of the specimens at the 

 summit of Santa Fe Baldy still immature on August 1. Many nymphs 

 of the intermediate population at Tomboy, Colo., were taken on Sept. 

 2, 1921, by Rehn and Hebard. 



