36 ENTOMOLOGICAL NEWS. [Jan., 'oS 



After a general summary of the field work completed, the paper is 

 divided into the following sections : Life Zones of Region Examined 

 (p. 7) ; Humid and Arid Faunas, Dispersal, Brachypterism (pp. 7-8) ; 

 Locust Coloration (pp. S-ii) ; Notes on Coloration and Variation 

 (pp. 11-12) ; Habits, Habitats and Local Lists (pp. 13-22) ; Extension 

 of Known Range (p. 23) ; List of New Species and Varieties Se- 

 cured (p. 23) ; Localities at which collecting was done (pp. 23-24) ; 

 Annotated List of Species (pp. 24-54). 



Under "Humid and Arid Faunas" the opinion is expressed that "the 

 transition from humid to arid conditions and fauna is gradual rather 

 than abrupt, the borderland of the two in Texas, Indian Territory 

 and Oklahoma being peopled by numerous genera and species of very 

 wide. .. .distribution, and also by some of more limited range re- 

 stricted to the district between the Mississippi River and the Rocky 

 Mountains, but occurring both in the humid and arid sections of this 

 region." Under "Brachypterism," the author states that aside from 

 the Tettiginze "every flightless species of locust known from the 

 eastern half of the continent is phytophilous, as distinguished from 

 geophilous, in habits. This statement is in accord with the author's 

 previously expressed view on brachypterism, but it appears to the re- 

 viewer that exception can be taken to this statement in several in- 

 stances, the most striking of which are the most decidedly brachypter- 

 ous and consequently flightless Aptenopedes sphenarwides and Radino- 

 ta tit in brcvipenne, both species being at all events as terrestrial as 

 Spharagemon bolli, which is considered (p. 37) a sylvan geophile. 



Under "Locust Coloration" (pp. 9-10), the author gives us a much 

 simpler and more logical argument than that presented by Vosseler to 

 account for the brilliant coloration of the wings of certain Acrididse. 

 The display of the wing color is considered to be a method of "signal- 

 ing, of attracting attention and thereby effecting or maintaining com- 

 munication between the sexes or the individuals of a community." 

 Under variation notes (p. 12), it is of particular interest to note that 

 the material collected by Prof. Morse demonstrates the necessity of 

 considering four nominal species of Trachyrhachis (Mestobrcgina of 

 authors) as mere geographic races of a widely-spread species. From a 

 type with a broad fuscous band on the wing and a lemon yellow disk 

 to the same (thoinasi), two intermediate forms (fuscifrons and oblit- 

 erata) carry the gradation to a type with the wing band entirely lack- 

 ing and the disk hyaline (kiowa). This variation is correlated with 

 climatic conditions, the strongly colored type inhabiting the more humid 

 regions, the hyaline type frequenting the more arid sections, the inter- 

 mediates occupying intermediate areas. 



The new species and varieties taken on the 1905 expedition were 

 Nomotetti.r cristatiis dcnticulaius, Hippiscus iiniiuiciilotits, Podisma 

 australis, Melanoplus latens, M. tuberculatus, M. tribuloides, M. 



