300 



FAMILY VI. ACRIDIDvE. THE LOCUSTS. 



acters as above given. Length of body, $, 21 24, 9, 2G 30; of antennae, 

 $, 911.5, 9, 1011.5; of tegmina, $, 2126, 9, 2430; of hind femora, 

 $, 1112, 9, 1314 mm. (Fig. 110.) 



A species of northern distribution ranging from Newfound- 

 land, Nova Scotia and New England, north and west to Hudson 



Bay, Vancouver, B. C., Great Bear 

 Lake and Arctic America, and 

 south and southwest to the north- 

 ern borders of New Jersey and 

 Pennsylvania. It is not known 

 from Indiana, but is frequent 

 throughout northern Michigan, 

 northern and eastern Minnesota 

 and northern and northwestern 

 Nebraska, but is not recorded far- 

 ther south than there west of the 

 Mississippi. It has been recorded 

 from Illinois by both Thomas and 

 McNeil!, but the latter (1901,440) 

 refers the record of Thomas to 

 Tr'uticrotroinx sa.rutnis and it is 

 probable that his own records were 

 based on the same species. 

 In New England Morse (1897, 113) says that: "Its favorite 

 haunts are bare ledges on elevated land and low mountains. On 

 these it delights to bask in the sunshine, crawling about over the 

 lichen-covered and weather-beaten rocks with whose tints its col- 

 oring harmonizes, or to hover in the air above them, sharply strid- 

 ulating. Its 'song' in flight is the loudest produced by any of our 

 locusts, and consists of a series of separate notes, clicks or snaps, 

 not a rattle, and is readily distinguished by this peculiar snapping 

 quality. It is one of the wariest of our locusts, being especially 

 shy and difficult to approach during the warmer part of the day, 

 when it often flies away to a distance of several rods and circles 

 about, returning to the place whence it started, or dances up and 

 down in the air, snapping loudly. The female sometimes makes a 

 soft flutter or shuffle of wings in flight, probably corresponding 

 to the snapping of the male, and both sexes can fly silently at will. 

 I have seen the male stridulate when at rest, also, by rubbing the 

 hind thighs against the tegmina, producing a 'scritching' sound 

 audible at a distance of three or four feet. The intercalary vein is 

 toothed, in a low but continuous series, for its entire length in the 

 male, and on the distal half or more in the female, in which the 

 teeth are lower and barely perceptible." 



Fig. no. Male. (After Lugger.) 



