256 PK O CEE DINGS OF THE NA TIONA L M I ~SE I 'M. 



between mesosternal lobes quadrate (male) or very transverse but nar- 

 rower than the lobes (female). Tegmina abbreviate, generally a little 

 longer than the pronotum, slightly overlapping, elliptical, apically 

 rounded, more than twice as long as broad, brownish fuscous. Fore 

 and middle femora considerably tumid in the male; hind femora mod- 

 erately slender, flavous, sometimes more or less ferruginous, obliquely 

 bifasciate with brownish or blackish fuscous, with a large blackish 

 genicular patch; hind tibiae pale green or glaucous, pallid or pale 

 flavous at the base, with a dusky patellar spot, the spines black in 

 more than the apical half, nine to ten in number in the outer series. 

 Extremity of male abdomen clavate, much recurved, the supraanal 

 plate triangular with acutangulate apex, rather flat, the median sulcus 

 broad, equal, shallow and percurrent, lying between low ridges which, 

 a,s well as the sulcus, are interrupted inesially; furcuhi consisting of a 

 pair of small, distant, triangular denticulations; cerci long and rather 

 slender, erect and gently incurved, tapering gradually from base to 

 middle, which is about two-thirds as broad as the base, beyond almost 

 equal but feebly enlarged, slightly produced inferiorly at the apex, and 

 the whole apical subequal portion feebly decurved; subgenital plate 

 somewhat longer than broad, subequal, apically elevated slightly and 

 produced to a delicate conical tubercle. 



Length of body, male, 16 rnm., female, 21.5 mm. ; antennae, male, 9.5 

 mm., female, 9 mm.; teginina, male, 5 mm., female, 5.25 mm.; hind 

 femora, male, 8.5 mm., female, 11.75 mm. 



Twelve males, 13 females. Illinois, Uhler; Bock Island, Illinois, 

 Walsh; Moline, Eock Island County, Illinois, J. McNeill; Ogle County, 

 Illinois, June 20, J. A. Allen; Riviere de Pare, June 14, L. Brnner; 

 Vigo County, Indiana, May 25, June 8, 11, Blatchley (W. S. Blatchley; 

 A. P. Morse). A specimen in the U. S. National Museum from Montana 

 perhaps belongs here. 



It has also been reported by McNeill from McLean County, Illinois, 

 and Monroe County, Indiana. 



This species is remarkable for the length of the antennae. It matures 

 very early, McNeill having taken it as early as June 5 in Illinois, where 

 he thinks it is the first Orthopteron to mature from eggs of the same 

 season. Blatchley records it in Indiana even as early as May 11. 

 McNeill says "it is by no means common, . . . being restricted to 

 a few localities [about Moline]. It shows a decided preference for the 

 sides of open, grassy ravines." One specimen before me is marked by 

 Blatchley as found in woods. 



The species has never before been described, but has been mentioned 

 by Walsh's names in several publications; the specific name "viridu- 

 lus" used on one or two occasions was a misreading of Walsh's name 

 "viridicrus," and probably originally due to bad chirography on my 

 part. 



