MORSE: ORTHOPTERA OF NEW ENGLAND. 259 
the environment in which the species was most abundant or most 
certain to be found, i.e., in which most of its activities were car- 
ried on. It is as follows: 
Geophilous (soil-loving) divison. 
Campestrian (open field) group. 
Xerophile (drought-loving) societies. 
Saxicolous (rock-inhabiting) species. 
Arenicolous (sand-inhabiting) species. 
Humicolous (loam-inhabiting) species. 
Hygrophile (moisture-loving) societies. 
Humicolous species. 
Paludicolous (marsh-inhabiting) species. 
Limicolous (shore-inhabiting) species. 
Sylvan (forest) group. 
Phytophilous (plant-loving) division. 
Campestrian group. 
Xerophile societies. 
Hygrophile societies. 
Sylvan group. 
Thamnophile (thicket-loving) societies. 
Dendrophile (tree-loving) societies. 
"Geophilous locusts are those which freely come into direct 
contact with the soil and whose local distribution is largely con- 
trolled by its character. Phytophilous locusts, on the other hand, 
have much closer relations with the vegetal covering of the soil, 
be it grass or tree. This primary difference in habits is accom- 
panied by a structural difference in the relative development of 
the tarsal pulvilli — large in the plant-perching species, diminu- 
tive, obsolescent, or aborted in the soil-inhabiting species. In 
eastern North America, with few exceptions, the Tettiginae^ and 
Oedipodinae^ are geophilous; the Tryxalinae^ and Acridiinae^ are 
phytophilous" (Morse). 
As applied to the New England species, this arrangement works 
out thus : 
^ Pygmy Locusts, Acrydiinae of this work. 
* Band-winged Locusts, Oedipodinae of this work. 
^ Slant-faced Locusts, Acridinae of this work. 
* Spine-throated Locusts, Locustinae of this work. 
