ORTIIOPTERA OF NOVA SCOTIA. — PIERS. 201 



acurum), 111. (Hancock, type locality), Ind. (Blatchley, as obscurum), and in 

 the higher regions from New Jers. and Penn. south to North Carol, and 

 Geo.; and no doubt will be found throughout the Alleghanian Division of 

 The Transition Zono. (The southern typical race, arenosuin arenosum of 

 Burmeister, occurs in the lower country of the (JaroUna.s [the type locality] 

 and Georg., all of Flo. and on the Gulf Coast and westward, and thus is more 

 restricted to the Lower Austral Zone.) 



Occurrence in Nova Scotia. — The common, stout, short- 

 pronotumed grouse-locust of western Nova Scotia, which 

 we have described, is here placed under the name Acrydium 

 arenosum angustum of Hancock (1896) on the definite author- 

 ity of J. A. G. Rehn, the well-known systematic orthopterist 

 of the Philadelphia Academy of Natural Sciences, who has 

 specially examined a number of specimens from this province. 

 The geographic race angustum is the northern member of 

 the arenosum species complex, of which the typical race 

 {arenosum arenosum of Burmeister) is found in the lower 

 country of the southern United States. Hancock's obscurum, 

 as well as others of his so-called forms, such as inflatum, etc., 

 are mere transitory variants of his angustum, the latter name 

 having page priority in his original paper (Trans. Am. Ent. 

 Soc, xxiii, 1896, 235-244), although some writers have 

 incorrectly grouped the synonymy under obscurum. Han- 

 cock's angustum was a slender-bodied form, whereas, as a 

 matter of fact our Nova Scotian insect agrees more closely 

 with his stouter variant inflatum or obscurum, names which 

 have been retired to the synonymy. The race angustum 

 has been found in both a long- and a short-pronotumed or 

 abbreviated form, the latter being the only one which has 

 been collected in Nova Scotia. 



In general appearance this abbreviated form has a 

 close resemblance to A. ornatum /r/an^fw/are of Scudder (1862) 

 which is reported as occurring rather commonly in sedgy 

 meadow-land in New England, and two of Mr. Gooderham's 

 Truro specimens were given that name by Prof. W. S. Blatch- 

 ley of Indiana who forwarded a specimen of obscurum for 

 comparison. Dr. E. M. Walker of Toronto, however, had 



