MORGAN HEBARD 259 



marshallii (Thomas), oregonensis (Thomas) and Jrigida (Bohe- 

 man). Puschnig has more recently described still another Euro- 

 pean species of Melanoplus as a Podisma, this being jJrossemi from 

 the Eisenhut in Carinthia. 



We would remark that, as a result of the above assignments, 

 all of the North American species remaining in the genus Podisma 

 have the caudal margin of the pronotum concave and entirely 

 lack organs of flight. To the genotype of Podisma, which is 

 pedestris (Linnaeus), three North American species of Asemoplus, 

 hispidus (Bruner), somesi here described and rainierensis Caudell, 

 show a strong general similarity, but, in our opinion, represent a 

 section of another valid unit. This unit, however, is almost as 

 difficult to define as those discussed above. 



In the preparation of the present paper we have met with most 

 kind and hearty cooperation from many of our fellow workers. 

 We are particularly indebted to Dr. E. M. Walker of the Uni- 

 versity of Toronto, Mr. Wm. T. Davis of New York and ]\Ir. 

 ]M. P. Somes, now of Kahspell, Montana. These gentlemen 

 have furnished material which has increased the number of unde- 

 scribed forms studied and has assisted in important comparative 

 studies. 



It must also be remembered that very large series are now 

 assembled for a study of the North American Melanopli, and that 

 these have proved invaluable in preparing the present series of 

 preliminary papers. Without the opportunity to study these 

 series, we would not be able to handle the problems involved with 

 anything like the assurance we now consider ourselves justified 

 in feeling. For the opportunity to study very important sec- 

 tions of these series we are deeply indebted to Mr. James A. G. 

 Rehn of the Academy of Natural Sciences of Philadelphia, Dr. 

 Samuel Henshaw of the Museum of Comparative Zoology and 

 IMr. A. N. Caudell of the United States National Museum. In 

 the present paper one thousand and forty-three specimens are 

 recorded, one thousand and eleven of these belonging to the 

 Philadelphia Collections. 



TRANS. AM. ENT. SOC, XLV. 



