1916.] 



NATURAL SCIENCES OF PHILADELPHIA. 



187 



cristatum 56 from Albany, Georgia. The latter specimen is, however, 

 somewhat larger, with longer tegmina and greater pronotal dimen- 

 sions than any other specimen in the present series. 



All of the material here studied belongs to one and the same 

 geographic race of S. collare, but agrees perfectly with none of the 

 known races as Morse has defined them. Taking Morse's differential 

 characters 57 the series falls under S. c. wyomingianum in having a 

 head which in facial aspect is nearly subequal in width, with more 

 prominent eyes and in the proximal fuscous bands on the inside of the 

 caudal femora being but faintly or not at all connected; in respect to 

 size, however, the series agrees with the larger S. c. scudderi; the pro- 

 notal crest is very high, suggesting a very strong tendency toward S. 

 crista turn. The increase in size of this series over New England 

 individuals of *S. c. wyomingianum, with accentuation of pronotal 

 cristation, may be due to geographic variation, but the specimens 

 before us from Virginia show no such variation, agreeing with 

 material from Florida. Study of the genus, with large series from 

 all portions of its distribution, can alone determine the validity and 

 distributional extent of the races of the present species. 



Measurements (in millimeters). 



Height Length 



Length Length of Length of 



c* of of pronotal of caudal 



body. pronotum. crest. tegmen. femur. 



Petersburg, Va 23.3* 6.9 2.4 26. 14.7 



Augusta, Ga 23.9 6.2 2.2 25.1 14.4 



Billy's Island, Ga 22.5-23.9 6.-6.2 2.1-2.3 24.-25.3 13.4-14. 



Albany, Ga 26.2 7.1 2.5 28. 14.7 



Thomasville, Ga 21.-23. 6.1-6.5 2.-2.2 21.2-25.4 11.6-14. 



Live Oak, Fla 23.2 6.6 2.1 24.7 14. 



9 



Petersburg, Va 30.5 7.3 2.5 28.8 16.3 



Thomasville, Ga 24.8-28.3 6.9-7.9 2.2-2.4 25.5-27. 15.-15.7 



Bainbridge, Ga. 58 28.2-29.9 7.4-8.3 2.5-2.9 27.8-29.3 15.3-16. 



Gainesville, Fla 26. 7.1 2.4 25.4 15.8 



The present ammophilous species was found very scarce in a sandy 

 field overgrown with scattered low weeds (Petersburg), only one 

 specimen was found in a sandy scrub oak area (Augusta), while a 

 pair were discovered in a sandy cotton field (Live Oak). 



56 Proc. Acad. Nat. Sci. Phila., 1910, p. 593, (1911). 

 67 Psyche, VII, p. 295, (1895). 



58 As Spring Creek is but a few miles from Bainbridge, we have here included 

 the measurements of the female from that locality. 



