Sept. 1899] Morse: New North American Tettigin^. 201 



Measurements. Total: ^',8.3-12.4; 9 > 9~I3- Pron.: J',8.2-11; ^,^-12. 

 H. fem.: ^, 5-5.5; 9, 5-5-6. Width of shoulders: ^, 2.6-3; 9; 2.8-3.5- 

 Antenna : 3-3.5. In long-winged examples the pronotum and wings pass the hind 

 femora from 3 to 4 mm. 



The types consist of 14 $ $ , 14 9 9j from Ames, Iowa, received 

 from E. D. Ball, taken from April 18 to Sept. 27, chiefly in April 

 and May. I also refer to this species specimens now before me from 

 iSIontreal, from Prince Arthur, Sudbury, Toronto, DeGrassi Pt., Ont., 

 from the North Red River, Englewood, S. D., Lincoln, Neb., Ind., 

 and Moline, 111. Named in honor of Dr. J. L. Hancock, in defer- 

 ence to his critical study of this group of locusts. 



Tettix crassus, sp. nov. 



A variable and very perplexing form of the ornatiis group, closely 

 related to and seemingly intermediate between typical ornatus, han- 

 cocki, and acadicus. It is distinguished from or?iatus by the more 

 robust form with wider shoulders, wider and more projecting vertex, 

 and less prominent eyes ; it lacks the enlarged middle femora of han- 

 cocki, which it otherwise resembles closely ; the form of the body is 

 shorter and more depressed, the humeral angles more pronounced, the 

 vertex less projecting, and the tegminal sinus less frequently shallow 

 than in typical acadicus. 



I refer to this form with some hesitation 18 ^^,23 9 9? from 

 Colorado, as follows : 14 c? ^ , 12 9 9 , (Scudder), 4 c? ^ , 5 9 9 , 

 (Henshaw), all of Morrison's collecting; i 9, Denver (Scudder), 

 I 9, Poudre Riv. (Bruner), 4 9 9 , C. P. Gillette (Morse). 



I cannot close without reiterating what I have said before, in the 

 hope of impressing upon collectors the desirability of securing consid- 

 erable series of specimens from each locality. This is a matter of the 

 utmost importance ; in fact, a necessity to the acquisition of an 

 adequate knowledge of the group in consequence of the wide individ- 

 ual variability and close specific resemblance among its members. To 

 Mr. E. D. Ball I am indebted for an opportunity to study an excellent 

 lot of material from Iowa, including several species in considerable 

 series, an opportunity which has enabled me to distinguish and char- 

 acterize one of the species described above. 



