REHN AND HEBARD 401 



Plummer's Island, Maryland, VIII, 27, 1909, (H. A. Allard), 1 cf, 1 9 ; 

 X, 1908, (Wm. Palmer), 1 cf , [all U. S. N. M.]. 



Washington, District of Columbia, VIII to IX, 17, 1907, (H. A. Allard), 

 2 d^, 2 9, [U. S. N. M.]. 



Raleigh, North Carolina, VIII, 22, 1906 and IX, 18, 1905, 2 9 , [U. S. X. M.]. 



New Orleans, Louisiana, XI, 14, 1882, (Shufeldt), 1 9, [U. S. N. M.]. 



Neoconocephalus retusus ''Scudder) (PI. XVI, figs. 12B to 121.) 



1879. Conocephalus retusus Scudder, Proc. Bost. Soc. Nat. Hist., xx, p. 

 93. [Georgia.] (Unique female.) 

 Conocephalus dissimilis of American authors (e.xcept Harris). 

 Conocephalus triops of numerous recent American authors. 

 1899. Conocephalus atlanticus Bruner, Ent. News, x, p. 38. [Philadel- 

 phia Neck, Pennsylvania; New Jersey; Maryland; Virginia.] 



It is surprising that recent American authors have generally 

 considered this species dissimilis or triops, which names apply 

 to the very different species which is last studied in the present 

 paper.2* The confusion surrounding the proper name for this 

 species, doubtless, was at least partially the cause of Bruner's con- 

 sidering material before him undescribed, and erecting the sy- 

 nonymic atlanticus. We have his type series before us, the only 

 material of the present species which he had, and, excepting a 

 gradual but pronounced increase in size southward accompanied 

 by a general proportionate elongation of the members, this smaller 

 material is inseparable from Scudder's larger type of retusus from 

 Georgia. Countless species of Orthoptera vary geographically in 

 similar fashion, and we are convinced that such size variation 

 without other difference is insufficient to constitute a geographic 

 race; when other differences do occur geographicalh^, or where 

 certain organs are diminished while others increase in size, these 

 characters being constant over certain areas of distribution (as in 

 Nemobius fasciatus and N'. fasciatus socius),-^ it is equally cer- 

 tain that geographic races do exist. 



-* This may in part have occurred through the various records of retusus, 

 atlanticus, triops, dissimilis and gladiator in the New Jersey lists, which 

 all apply to the present species. This really amazing confusion was due 

 to the fact that J. B. Smith himself compiled these lists from a list compiled 

 by the present senior author, adding other records from past literature 

 and determinations of various other indi^•iduals, re[)ublishing the final re- 

 sults without consulting any authority on the subject. 



29 See Hebard, Proc. Acad. Nat. Sci. Phila., 1913, p. 422 (1913). 



TRANS. AM. ENT. SOC, XL. , 



