1913.] NATURAL SCIENCES OF PHILADELPHIA. 415 



Dallas, Tex., is before us, upon which Scudder based his N. canus; 

 these specimens belong to the race fasciatus socius, while specimens 

 from places in the region where fasciatus and fasciatus socius appar- 

 ently intergrade, Raleigh, N. C, and Crawford County, Ind., are 

 of the same light coloration but somewhat more slender. Specimens 

 oi fasciatus proper from Long Island, N. Y., and Falls Church, Va., 

 are equally pale, being russet in general coloration, but none are as 

 robust as the individuals from Dallas, Tex. In all of these specimens 

 as well as in a somewhat darker but very brilliantly colored series 

 from Thompson's Mills, Ga., the males have the coloration of the 

 discoidal vein more pronounced, while the area between this and the 

 free veins of the lateral field is seal brown proximad and of that 

 coloration to the end of the tegmen between the discoidal and medi- 

 astine veins. It is interesting to note that in such pale specimens of 

 the present species as well as in those of very dark coloration the 

 longitudinal stripes of the occiput are absent, while these stripes 

 become more and more pronounced between the extremes of light 

 and dark coloration until in the absolute intermediates-^ they are 

 usually well defined. 



Very dark individuals of fasciatus proper are to be found in almost 

 every series, but this is much more pronounced in individuals from 

 the more northern points of the species' distribution. In the material 

 before us this is very noticeable in a series from Oxford, Mass., which 

 are for the greater part small in size and very dark. In these speci- 

 mens the light portion of the lateral lobes is much reduced and ob- 

 scured while in the darkest specimens of the series it is absent, the 

 yellowish coloration of the discoidal vein is scarcely perceptible to 

 the naked eye. The few lighter specimens in this series, however, 

 have the occipital stripes more pronounced than in any other speci- 

 mens of the species before us. 



Every conceivable intergradation between the extremes of the 

 species is to be found in the present series not only in coloration, but 

 also in size and in length of tegmina, wings, caudal femur, and ovi- 

 positor. 



Distribution.— Typicsd fasciatus is to be found from Prince Edward 

 Island across the Dominion of Canada westward to the prairie region 

 in Manitoba, where its place is occupied by fasciatus abortivus. 

 South of this countrj^ that geographic race gives place again to 



29 The intermediates here referred to are usually few in number, as by far the 

 majority of individuals of the species approach the dark extremes more or less 

 closely. 



