1916.] NATURAL S( IKXCKS OF PHILADELPHIA. 259 



averages the smallest of any before us, the average being nearer 

 the minimum measurements given above. 



The material before us shows the vertex to be variable in the 

 presenl insect, both in degree of production and shape. The vertex 

 ranges from a produced form in which the apical spine is long and 

 nearly straight, to one in which the vertex is decidedly less produced 

 with the apical spine short and strongly uncinate. The former type 

 is most decided in material before us from Live Oak and the region 

 about Jacksonville, while the specimens from Thomasville represent 

 the most decided development of the latter type. 



The majority of specimens before us are, apparently irrespective 

 of sex, of the green color phase. In the brown color phase the 

 latero-dorsal lines of the pronotum are more pronounced. 



The present species is one of the latest to appear; in southern 

 Georgia adults are present in the greatest numbers probably early in 

 December, at which time the first killing frosts usually occur. Davis 

 has found the closely related B. rehni apparently hibernating in 

 winter in northeastern peninsular Florida. 



The above records considerably extend the known range of the 

 species both norttrward and southward. The material before us was 

 taken in an open spot in the pine woods covered w r ith high grass 

 (Florence), in wet spot in pine woods (Ashley Junction), in gray-bark 

 pine woods in heavy undergrowth of green plants and vines (Isle of 

 Hope and Sandfly), on a young cabbage palmetto (Thomasville), 

 in a palmetto "hammock," in a tangle of raspberry and grape vines 

 and other plants (Atlantic Beach), in a small clump of ground oak 

 on the side of a sink hole (Live Oak) and on pineapple (Orlando). 



Belocephalus davisi new species. 



The present species, which we take pleasure in naming after the 

 devoted student of this genus, Mr. William T. Davis, is related more 

 closely to B. sabalis and B. sleighti than to the other species of the 

 g< mis. It is a large insect, nearly as robust as the two species men- 

 tioned above, but agrees with the otherwise very different B. sub- 

 apU rus in having similar black markings on head, antennae and 

 pronotum. 



Nearest affinity to sabalis and sleighti is shown by the supra- 

 anal plate, which in these species only is very deeply emarginate 

 mesad. This deep emargination is usually constant in form and 

 distinctive in these species; in sabalis it has the sides straight with 

 angle acute, the lateral productions formed by this emargination 

 have evenly converging sides with acute apex situated mesad; 



