168 FAMILY V. TETRIGIDJE. THE GROUSE LOCUSTS. 



tinctly projecting. Frontal costa distinctly sinuate opposite middle of 

 eyes, its sides parallel and sulcus rather wide and deep. Pronotum with 

 front margin truncate and posterior process acute; dorsal surface finely 

 and evenly granulate, notably widened between the shoulders, the humeral 

 angles obtusely rounded; tegminal sinus small, shallow, the lower one 

 widely angulate, the median lobe between the two feebly developed. Teg- 

 mina elongate-oval, their tips subacuminate. Wings extending to or nearly 

 to apex of prono'tum. Length of body, $, 9.5 10; of pronotum, 9 9.6; 

 of hind femora, 5.5 6 mm. (Fig. 61.) 



This is also a species of northern range, Scudder's type being 

 from Lake of the Woods, Ontario. Recorded in our territory from 

 Baraga County, Michigan, July 5 Aug. 1. (Rclm, 

 1904d, 232) ; Diamond Lake, Temagami District and 

 Ft. William, Ontario (E. M. Wulker, 1909, 175). 

 Known also from Cheboygan Co., Mich., Aweme, Man- 

 itoba, St. Anthony Park, Minn., Steamboat Springs 

 and San Louis, Colorado, Nebraska and northern New 

 Mexico. Walker's specimen from Ft. Williams was a 

 Fe long form female, with body 11 and prouotuni 12.2 

 mm. in length. It appears to prefer much the same 

 habitats as does A. (jrcnntlatuni, occurring about the 

 edges of peat bogs and cedar swamps and along the banks of 

 streams. A St. Anthony Park specimen has a large white spot 

 across the pronotum at its widest part, this bordered in front by 

 two small and behind by two larger triangular black velvety spots. 

 The males appear to be very scarce. There are none in the Na- 

 tional Museum or Hancock collections and the only specific men- 

 tion of them is by Rehn (1904, 232), who records two from Pe- 

 quaming, Mich. 

 69. ACRYDIUM ARENOSUM (Burm.), 1838, 659. Sanded Grouse Locust. 



Body rather slender; pronotum everywhere minutely granulate but 

 little rugose or wrinkled. Color grayish or blackish, often with a large 

 squarish white spot on dorsal surface between the humeral angles, this 

 spot usually with 'traces of black on its hind margin. Vertex, viewed from 

 above, nearly twice the width of one of the eyes, extending but little be- 

 yond front of them, its front margin subtruncate; median carina indis- 

 tinct, scarcely if at all projecting. Antennas slender, the joints elongate. 

 Pronotum as described in key, front margin truncate, posterior portion 

 usually prolonged and extending much beyond the hind femora; tegminal 

 sinus rather deep, the lower sinus wider and deeper, the lobe between 

 them prominent, obtuse. Tegmina elongate-oval, their tips obtusely 

 rounded. Inner wings fully developed, a little surpassing the tip of pro- 

 notum. Front femora sinuate or lobed beneath. Length of body, $ , 8 12, 



2, 9 14; of pronotum, $, 9.8 10.5, $, 1213; of hind femora, $, 4.3 5, 



9 , 5.35.7 mm. 



