JAMES A. G. REHN" 
171 
DESCRIPTIONS OF NEW AND CRITICAL NOTES UPON 
PREVIOUSLY KNOWN FORMS OF NORTH 
AMERICAN OEDIPODINAE (ORTHOP- 
TERA; ACRIDIDAE) 
Second Paper 
BY JAMES A. G. KEHX 
111 the first iiaper of this series^ we have presented some pref- 
atory matter that applies with equal force to the present con- 
triliiition, wliich represents a continuation of the same study. 
A critical study of the forms which have been referred to the 
genus Circotettix by various authors has resulted in the accumu- 
lation of much information, a iiortion of which, however, will re- 
(piire more (kdinite correlation with the entities which have been 
referred' to the genus Trinterotropis. This wilt be done in the 
very near future. At this time we are jiresenting, solely, such 
critical comments lirought forth by our work on the Circotetti- 
gine section of the study, as it seems desiralile to publish in ad- 
vance of the entire revision. 
The Generic Position and Geographic Races of Oedipoda carlimana 
Thonias (Circotettix carlinianus of Authors) 
A critical examination of the species which have been referred 
by authors to the genus Circotettix, shows most conclusively that 
w(' have a number of aggrc'gations represented in thatassemldage, 
and of these but few show sufficient affinity to be retained in re- 
stricted Circotettix, the genotype of which is, as originally stated 
l)y Scudder.- Oedipoda undulata Thomas. 1 have lieen fortunate 
enough to be able to examine the unique type specimen of tui- 
didata, in the United States National Museum, and its real iden- 
tity had not been suspectetl by any recent workers. ^\ e will 
discuss this on a succeeding page. 
The first section which it is necessary to segregate is that con- 
taining the forms of the carlinianus type. This we find to rep- 
resent a valid genus, showing slightly more affinity with the 
1 Trans. Anier. Entoni. Soc., xlv, pp. 229 to 2.53, pfs. xxvi to xxviii,(1919). 
- Bull. Geol. and Geogr. Surv. Terr., ii, p. 2G5, (1S76). 
TK.SX.S. AM. EXT. SOC., XLVII. 
