382 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERa) 



the mainland, but never out on the tidal flats where melanorhinus 

 is found. 



The ventral surface of the long heavy vertex is almost always 

 jet black, very rarely pale green individuals have the portion 

 about the proximal tooth less darkened, and in one specimen be- 

 fore us the dark coloration extends only to the base of the tooth, 

 leaving the tooth and brief proximal portion green. 



The present species usually has the ventro-cephalic margins 

 of the cephalic and median femora unarmed, occasionally bearing 

 single spines; the ventral margins of the caudal femora are sup- 

 plied with a number (though averaging somewhat fewer than in 

 exiliscanorus) of irregularly spaced delicate spines which are sim- 

 ilar to those of melanorhinus and longer than those of exiliscanorus, 

 extremes in number here studied, internal 7-12, external 3-6, 



For measurements see page 383. 



This insect varies from very dark brown to a rich and brilliant 

 green in general coloration, several specimens from Tuckahoe, 

 New Jersey, were when fresh and still are absolutely intermediate 

 between the two extremes, being a pale greenish-yellow in gen- 

 eral coloration; every other gradation is to be found in the series 

 before us. 



On several occasions during the summer of 1914, the junior 

 author was during the late afternoon in localities where this 

 species was abundant, but at no time were males heard stridulating 

 until after dark. Mr. Davis, however, writes that he has found 

 the males stridulating on an afternoon during the summer of 

 1914 on Staten Island; we are of the opinion that at favorable times 

 all of the species at present under consideration stridulate dur- 

 ing the day time, but probably never as vigorously as they do on 

 similar occasions at night. This msect's song is a weak and high- 

 pitched continuous buzzing, very much like that of N. retusus, but, 

 though weak, distinctly stronger than in that species. In this 

 way during night collecting at Tuckahoe, New Jersey, where 

 both species were plentiful and stridulating constantly on all 

 sides, it was usually possible to determine individuals of this 

 species and of retusus before approaching closely. This song is 

 compared with the very similar stridulation of 'melanorhinus under 

 that species. Individuals were easily taken after dark by aid of 



