176 FAMILY V. TETRIGID.E. THE GROUSE LOCUSTS. 



black, the tibiae annulate with light and dark. Vertex slightly narrower 

 than one of the eyes, male, equal in width to one of them, female, reaching 

 nearly to front border of eyes; median carina faint, not projecting in 

 front ; disc feebly but acutely notched opposite middle of eyes, its front 

 portion shorter and narrower than hind one. Frontal costa but slightly 

 advanced in front of eyes, its branches but feebly divergent, the sulcus 

 narrow, deep. Pronotum with dorsal surface almost flat, median carina 

 wanting or indistinct on front portion, low on the elongated posterior pro- 

 cess, which extends about 3 mm. beyond the tips of hind 

 femora; humeral angles carinate, obtuse, less so in males; 

 anterior carinre faint, short, feebly diverging apically; hind 

 margin of lateral lobes bisinuate; tegminal sinus shallow, 

 lower one much wider and deeper, the lobe between them 

 obliquely rounded. Tegmina elongate, narrow, their tips 

 subacuminate; wings usually surpassing tip of pronotum by 

 2 mm. Middle femora feebly sinuate above, varying from 

 almost straight to strongly undulate below; hind femora 

 rather stout, finely granulate and with numerous indis- 

 tinct oblique ridges on outer face. Length of body, $ , 10 

 12-5, 9, 12.515.5; of pronotum, $, 9.511, $, 1113.4; 



of hind femora ' $, 5 - 5 ' 9 G - 5 7 mm - < Fi S- 63 -> 

 Lugger.) 



Common throughout southern Indiana, less so in the northern 

 portion; Feb. 21 Nov. 28; Livingstone, Ky., June 21; Mobile, 

 Ala., Aug. 30; Agricultural College, Miss., Aug. 22; Chester and 

 Pine Bluff, Ark., Sept. 1 Oct. 23; Sherman, Texas, July 5. In 

 Florida it has been recorded only from Marianna, but specimens 

 are in the Gainesville collection labelled "Lake City, June 3." 

 Kanges from Ontario and New England, west to Minnesota and 

 Colorado and south to northern Florida and central Texas. 



In Indiana the hooded grouse locust is found throughout the 

 year, hibernating in winter beneath logs and other cover close to 

 its favorite summer haunts. These are the damp sandy or muddy 

 banks of ponds, lakes and streams, where from midsummer to late 

 autumn it is found by hundreds, usually in company with Galgu- 

 lus oculutiis and other semi-aquatic insects. Its modest hues agree 

 admirably with such surroundings, thus furnishing the insect valu- 

 able protection against its foes. When disturbed it more often flies 

 than leaps, its flight being more prolonged than that of any other 

 of the Indiana Tetrigians, and often alights upon the water, 

 where it swims with ease, its dilated hind tibiae being then of 

 much aid to its onward progress. Morse (1894a, 164) states that 

 it is common at Ithaca, New York, "along the stony margins of 

 the creeks and exactly matches in tint the fragments of slate-gray 

 shale on which it delights to sun itself, becoming in consequence 



