MICHIGAN SURVEY, 1905. 



THE ECOLOGICAL RELATIONS OF THE ORTHOPTERA IN THE 

 PORCUPINE MOUNTAINS, MICHIGAN. 



ALBERT PITTS MORSE, RESEARCH ASSISTANT, CARNEGIE INSTITUTION OF 



WASHINGTON. 



rnese naDitats, or ,.. 



from the standpoint of locust biology, may be arranged in three major 



groups : 



1. Bare rock and soil surfaces of the lake shore, clearing, mountain 

 top, or talus slope, either wet or dry, these are inhabited by campestral 

 geophilous locusts. 



2. Areas clothed with a low vegetal growth of grasses or other herbaceous 

 plants, such as meadows, fields, clearings, etc., likewise varying greatly 

 in moisture content of soil, and often extremely limited in size, these 

 are the haunts of campestral phytophilous locusts. 



3. Thickets of shrubs or stunted undergrowth bordering forest edges 

 and openings, either along the lake shore, about clearings, or on the mountain 

 top, here dwell the sylvan phytophilous species. 



Of the Locustarians collected, one species is a bush-dwelling form, nearly 

 related to the katydid; the other, a shield-backed grasshopper, is a typical 

 thicket-inhabiting species. 



