354 ENTOMOLOGICAL NEWS [Oct., 'lO 



positing", while the more or less attentive males spend their 

 time stridulating until silenced by the chilly hours of nightfall. 

 The characteristic note of this field-cricket in New England is 

 a short, brisk chirp, repeated at more or less regular intervals. 

 In the piedmont region of Northern Georgia, where Gryllus 

 pcnnsylvanicus is also very common, the characteristic stridu- 

 lation is a rather weak, prolonged trill. The chirping stridula- 

 tion in North Georgia is far less common, and seems to be the 

 distinctive note of a form of this species appearing later in the 

 season. In New England the chirping form seems to occur 

 exclusively, as in this region I have never heard the more pro- 

 longed trill of the southern form. 



Throughout October and early November the little ground 

 cricket Nemobius fasciatus var. vittatus DeGeer fairly swarms 

 in the grass fields and pastures of much of New England. Al- 

 though I have observed and collected the short-winged forms 

 of this cricket many years at Oxford, Massachusetts, I have 

 never yet taken the long-winged form in this region. Around 

 Washington, D. C., however, I have found the long- winged 

 form intermingling with the short-winged form in some local- 

 ities, and in others entirely wanting. Those factors which de- 

 termine the presence or absence of the long-winged or short- 

 winged forms of this Nemobius in any locality throughout its 

 range are not yet obvious. 



Nemobius fasciatus, as well as Gryllus pcnnsylvanicus in- 

 cludes two singing forms in portions of its range. I have noted 

 these two forms definitely only for the short-winged vittatus at 

 Oxford, Mass. Here both singing forms of vittatus are very 

 common. The stridulation of one of these forms is a very 

 high-pitched, prolonged trill, ti-ti-ti-ti-ti-ti-ti-ti-ti : that of the 

 other form is a very brief, shrill, intermittent tiiii-tiiii-tiiii. A 

 considerably lower pitch quite sharply distinguishes the brief 

 intermittent notes, tiiii-tiiii, from the prolonged trill. These 

 two trilling forms of Nemobius fascatns var. vittatus are quite 

 definitely confined in separate colonies, and in different locali- 

 ties. The prolonged trilling form occupies almost exclusively 

 the dry, grassy upland lidds and pastures. In the damp and 



