30 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



rial of molossum and the extensive representation of this species 

 now in our hands. The description of silvaticum is brief and 

 unsatisfactory, only non-essential characters being mentioned, 

 but there is sufficient in the way of proportions and remarks on 

 the relationship, supplemented later by McNeill's key, to enable 

 us to place the name with some degree of certainty. In the 

 synonymizing of molossum and nitidum we are compelled to re- 

 verse our previous definition of the latter^-, which name we for- 

 merly considered to belong to the species later named pulchellum 

 by Davis, and for which we here use Redtenbacher's name lati'- 

 cauda. This reversal we feel is warranted, as we are now able 

 to state that the species to which we tl^en applied the name niti- 

 dum was before Redtenbacher when he described the latter and 

 formed the basis of his laticauda. By changing our views we 

 must place molossum in the synonymy. The name spinulosum 

 was based on small, shorter winged individuals of nitidum, which 

 had the dorsum of the pronotum infuscate or possessed paired 

 pronotal bars, while the typical material of nitidum was uni- 

 colorous on the pronotum. This more or less varied infuscation 

 of the dorsum of the pronotum with additional dark bars means 

 nothing of diagnostic value in this or several other species of the 

 genus, while our series shows greater range in general size and 

 tegminal proportions than given in the descriptions of nitidum and 

 spinulosum by Redtenbacher. 



In size we find a general, or rather average, increase southward. 

 In using the word "southward" it should here be qualified in 

 meaning to designate the Austroriparian element which extends 

 northward along the low coastal region, instead of mere southern 

 latitude. However, this average southern increase is not in- 

 variable, as in numerous series, such as those from Tinicum, Lake 

 Waccamaw, Tybee Island, Jacksonville, Ortega and Atlantic 

 Beach, we find very considerable individual variation. In addi- 

 tion, local, probably environmental, factors seem to influence 

 size, as the Atlantic Beach series averages appreciably smaller 

 than the Jacksonville representation, while the Wrightsville and 

 Tybee Island salt marsh specimens are as a whole decidedly 

 smaller than specimens from the comparatively close localities 

 of Winter Park and Cumberland Island respectively. 



12 Proc. Acad. Nat. Sci. Phila., 1907, p. 306, (1907). 



