426 FAMILY VI. ACRIDID/E. THE LOCUSTS. 



Tegmina as described in key. Hind femora dull yellowish-brown, lower 

 face dull yellow; knees blackish. Hind tibias either pale greenish-blue or 

 dull red, the spines black. Interocular space one and a half times, male, 

 or twice, female, as broad as basal joint of antennae; fastigium strongly 

 declivent, distinctly and broadly sulcate throughout, male, almost flat, fe- 

 male. Frontal costa rather wide, nearly equal throughout, faintly sulcate 

 at and below the ocellus. Pronotum as described above, its hind margin 

 broadly obtuse-angled; prozona distinctly, male, or scarcely, female, longer 

 than the closely punctate metazona. Tegmina reaching or slightly sur- 

 passing tips of hind femora, slender, tapering. Supra-anal plate strongly 

 and abruptly narrowed at apical third, the narrowed portion in a lower 

 plane, its apex rather blunt; sides of basal portion thickened, curved and 

 upturned; median sulcus wide, rather shallow, confined to the broad basal 

 portion of the plate. Furcula as described in key, lying outside the bases 

 of the median ridges (PI. IV, m.) Cerci rather short, spatulate, incurved, 

 the middle third narrowest, apical third nearly as broad as base, concave 

 without, its tip broadly rounded. Subgenital plate as long as broad, the 

 apex a third narrower than base, its median portion a little elevated, sub- 

 truncate, broadly and feebly impressed behind, thus causing it to appear 

 slightly emarginate. Length of body, $, 1922, 9, 2122; of antennae, 

 $, 9.5, 9, 8; of pronotuni, $ and $,5; of tegmina, $, 16 17, 9, 16 18; 

 of hind femora, $ , 1112, 9 , 12 13 mm. 



This locust is known in Indiana only from the northwestern 

 counties, where it is one of the most common species about the 

 south shore of Lake Michigan, occurring in company with M. 

 atlanis (Riley), Spharagemon wyomingianum (Thos.) and others 

 over a large part of the sandy area within five miles of the lake. 

 It seems to prefer such barren localities to those more promising 

 in plant food, since Bruuer mentions its partiality for "old break- 

 ings and well-fed pastures of many years' use." It probably be- 

 gins to reach maturity some time in June, as numerous pairs have 

 been found mating in late July. Specimens were also taken from 

 along railway embankments near Kewanna, Fulton Co., July 14. 



The hind tibiae of at least a third of the specimens of anfjusti- 

 pcnuis taken in Indiana are red instead of blue. Since Scudder 

 based his separation of his nominal species coccincipcs on the col- 

 or of the tibise and degree of maculation of the tegmina, I (100.3, 

 322) definitely placed cocciucipcs as a synonym of Dodge's spe- 

 cies. A year later Gillette (1004, 40) recorded coccincipcs as oc- 

 curring in moderate numbers over the entire plains region of Col- 

 orado and extending for some distance into the foothills, and 

 added: "It seems quite probable that this species is nothing more 

 than a form of fuifiiixtipcnuifi having red hind tibiftv" R. & H. 

 (1000, 412) record two Colorado specimens of coccincipcs as hav- 

 ing glaucous tibia 1 , and state that "they are much inclined toward 

 the opinion recently expressed by Gillette to the effect that M. coc- 



