Sept., '06] ENTOMOLOGICAL NEWS. 253 



local lists of both insects and plants, would be steps in the 

 right direction. For this study involves such a variety of 

 elements which go to determine the ecological relations of the 

 plant and insect life — the fauna and flora — of the regions we 

 are considering, that much time and study will be necessary. 

 But the results will be commeasurate with the labor, for they 

 will not only add greatly to our knowledge, but also clear up 

 some of the most interesting of the unsettled problems of biology. 



On the Orthopteran Genus Ageneotettix, with a 



description of a new species from Illinois. 



By Dr. J. L,. Hancock, F.E.S. 



A study of a series of specimens of the genus Ageneotetiix 

 from Illinois has given rise to the question whether there has 

 not been discrepencies, by authors, in the identity of the de- 

 scribed species of this genus. This refers especially to the 

 species found in the region about Chicago, which is evidently 

 undescribed, or more properly has been mistaken for another 

 species. But before further discussing this phase of the sub- 

 ject it may be well first to give a brief resume of the literature. 

 In 1898, Dr. S. H. Scudder* published "A Preliminary Clas- 

 sification of the Tryxalinse of the United States," wherein is 

 noted the following definition of the genus Ageneotetiix : 

 " Pronotum not constricted in the middle, the prozona slightly 

 the longer, lateral carinae obsolete on the prozona." Scud- 

 der f again describes the genus as follows : "Generally smaller 

 forms. Median carina of prozona not cut by the transverse 

 sulci, foveolse of male subequal, rhomboidal ; hind tibiae red, 

 lower apical spur of inner side of same fully half as long again 

 as upper spur." 



McNeill X first proposed the present accepted name Ageneo- 

 tetiix, substituting this name for Eremnns which was preoccu- 

 pied. In his key to the genera of Tryxalince \ | we find his 

 genus distinguished as follows : "Median carina of the prono- 

 tum cut behind the middle of the pronotum. Vertex of the 

 head destitute of a median carina. Posterior margin of the 

 metazone very obtusely angulate." According to this author, 



* Psyche, viii, No. 267, p. 231. 



t Guide to the Genera and Classification of the North American Orthoptera, p. 31, 1897. 



{Psyche, viii, p. 71. 

 Revision of the Truxalinae of North America, Proc. Daven. Acad. Nat. Sci., vi. 1897. 



