166 FAMILY V. TETRIGID^E. THE GROUSE LOCUSTS. 



than in granulatum, its dorsal front margin truncate; median carina dis- 

 tinct but not as high as in granulatum,. Inner wings fully developed, ex- 

 tending slightly beyond apex of pronotum (Fig. 2.) The short form, 

 Tettix triangularis Scudder (1862, 475) appears somewhat stouter, due to 

 the abbreviated pronotum which is more acute and reaches only the tips 

 of hind femora, while the wings do not extend beyond its apex (Fig. 2.) 

 The two forms have been proven by Hancock to interbreed and the meas- 

 urements intergrade, the following being the extremes. Length of body 

 $, 8.512.5, $, 913.5; of pronotum, $, 7.510.5, 5, 812; of hind fe- 

 mora, $, 4.5 5.5, 9, 5 7 mm. (Fig. 590 



The ornate grouse locust is a common species throughout Indi- 

 ana, and may be found any mouth in the year, but is most abun- 

 dant in late autumn and early spring, occurring then usually along 

 the edges of dry open woods and on gravelly hillsides, while in 

 summer it is occasionally found in company with Pnratettix cu- 

 cullatus (Burin.) about the borders of streams and ponds. It 

 sometimes makes its home in grassy plots and lawns, especially 

 those which are wooded, in the outskirts of cities, and is then 

 often seen sunning on the cement and other sidew r alks along their 

 margins. The form triangularis more often occurs in sandy local- 

 ities, and in some places far outnumbers the typical form. 



On a bright sunny afternoon in late November, I once found 

 both forms of oritatum very common on a sloping hillside two 

 miles north of Indianapolis. A clover field was here adjoining 

 an open woods pasture, and the second crop had been cut in 

 October for the seed. Many of the dead stalks had fallen close 

 along the fence row separating the fields, and here the little lo- 

 custs were in abundance, their bodies all grayish-brown, and cor- 

 responding very closely to the dead clover stems ; so closely, indeed, 

 that they were not visible until they hopped, and then had to be 

 "marked down" before they were captured. Beneath the bottom 

 rails of the old fence they had found a comfortable abiding place 

 and winter retreat, and on this bright afternoon had been tempted 

 forth to bask in the sunlight and perchance to feed upon the green 

 clover leaves which were yet abundant in places among the dead 

 and fallen stems. 



A. ornatuni ranges from New England and Ontario west to 

 Alberta and Colorado and south and southwest to North Caro- 

 lina, Tennessee, Mississippi, Texas and New Mexico. It is re- 

 corded by Scudder from the summit of Mt. Washington, and in 

 the northern states is often found in company with Noinntctti.r 

 cristatus and Acn/dunii (/niiiiiJfihun. though usually preferring 

 dryer localities than does the latter species. 



