PSYCHE. 



:!2l 



Tliis area, however, is. a broad one 

 of complex topography and has been but 

 little studied except near Boston and 

 Wellesley and on parts of Cape Cod. 



While the larger part of the area of 

 New England thus lies in the transi- 

 tion zone, the locusts inhabiting it are 

 very largely austral in character. 



Ttu'ning to the extra-limital distii- 

 bution of the New England species we 

 find strong conformation of the con- 

 clusions drawn from their intra-limital 

 distribution, the two being closely par- 

 allel in character, each species having, 

 with rare exception, the same zonal 

 range extra-limitally as intra-limitally. 



This isothermal or zonal distribution 

 is very striking in a tabular arrangement 

 where we find that by far the larger 

 number of the species are distriliutcd 

 more or less widely over the upper aus- 

 tral and transition zones, chiefly in their 

 eastern — Carolinian and Alleghanian — 

 areas, a fact that would seem to indicate 

 that the transition is essentially a part 

 of the upper austial. A small number 

 extend into three zones — the two 

 above-mentioned and either the boreal 

 or the lower austral, and a few cases 

 occur of presence in four and of restric- 

 tion to one. 



Owing to the lack in many cases of 

 enough, and of sufficiently accurate and 

 definite, data it is impossible to speak 

 otherwise than in very general terms, 

 nor would time and space permit a dis- 

 cussion of details. And while it is true 

 that the family has been studied and 

 collected most in the transition and up- 

 per austral zones and that we have 



relatively few data from the boreal and 

 lower austral zones it is believed that 

 subsequent study will tend to confirm 

 rather than disprove the statements 

 made above. 



The distribution of a few species is 

 of more than ordinary interest. Mela- 

 nophts atlanis has a remarkably wide 

 range, from Nova Scotia to Beaufort, 

 N. C, Winnipeg, Alberta, and Wash- 

 ington to Orizaba, Mex. ; Mel. fascia- 

 tiis ranges from Labrador and New- 

 f lumllauil to New Jersey, Michigan to 

 Missouri, Alberta and Washington to 

 Colorado ; Paroxya fioridana from 

 Boston, Mass., and Michigan to the 

 Gulf of Mexico ; Orphula olivacea from 

 Stamford, Ct., and the Bermuda Ids. to 

 Darien and Venezuela ; Tryxalis brevi- 

 cornis from Long Island to Honduras, 

 vSt. Domingo and Brazil. Hcsperotet- 

 tix brevipetuiis has been found at Wal- 

 pole and Wellesley, Mass., in New Jer- 

 sey and Georgia, while of its ninnerous 

 congeners none approach nearer than 

 the Great Plains. Trimerotropis tnari- 

 tima is found along the Atlantic coast 

 from Maine to Florida and occurs in a 

 slightly differing form on the shore of 

 several of the Great Lakes, a fact ex- 

 plained by and tending to confirm the 

 theory of the previous existence of a 

 southern connection — by way of the 

 Mohawk and Hudson valleys — of the 

 Great Lake basin with the Atlantic sea- 

 board in the vicinity of New York City, 

 a connection believed to have been open 

 during the close of the glacial period. 



Brief mention only may be made of 

 the seasonal distribution. As stated 



