191-4.] NATURAL SCIENCES OF PHILADELPHIA. 401 



In size the present series shows but little variation. The two 

 Long Key nymphs are in quite different stages, the male being in the 

 instar preceding maturity, while tiie female is not a third the size 

 of the male. The Key West nymph is in the second instar preceding 

 maturity. 

 Belocephalus sabalis Davis. 



Homestead, Fla., July 10, 1912; 28 &. 



Marathon, Kay Vaca, Fla., July 9, 1912; 1 cT. 



A comparison of this interesting series, the largest known of any 

 single species of the genus, with a paratypic male from Punta Gorda, 

 kindly presented to us by Mr. Davis, shows that while fully in accord 

 in all the important specific characters the Homestead series uni- 

 formly differs in having the fastigium shorter, though of similar 

 form, while the black marking of the clypeal suture is pronounced 

 only in the brown phase and not always present in that condition. 

 One single green male shows indications of this sutural marking, but 

 in the others the face is unicolorous. The Marathon male has the 

 fastigium more as in the paratype than is true of the Homestead 

 specimens, but the apex is even there less elongate than in the Punta 

 Gorda specimens, while the clypeal suture has no black. These 

 differences are probably environmental or geographic but hardly 

 specific in character. 



In size there is considerable individual variation, the extremes of 



the Homestead series presenting the measurements in millimeters 



given below, with which are placed those of the Marathon male, 



which appreciably surpasses in build any from the mainland, and 



of the Punta Gorda paratype. 



Punta 

 Marathon, Gorda 



Homestead. Kgy Vaca. (paratype) . 



Length of body 34. 41. 45. 38.6 



Length of fastigium from eyes 3.1 3.5 4.2 4.5 



Length of pronotum 8.6 8.6 10.4 9.2 



Length of tegmen 5.2 6.7 7.9 7.1 



Length of caudal femur 15.9 16.2 19.7 18. 



Seven of the Homestead males are in the brown phase, all of the 

 remainder in the green phase of coloration. The brown specimens 

 have the broad dorsal darker bar mentioned by Davis. 



At Homestead the species was very common on scrub palmetto 

 {Serenoa serrulata) in the pine woods, rarely on other plants (two on 

 sugar cane, one on a pine tree, and one on a low bush) and only found 

 at night, when their stridulations permitted stalking with a flash- 



