192 PROCEEDINGS OF THE ACADEMY OF [April, 



this insect hybridizes with T. maritima is explained under that 

 species. 61 



Although the present species is essentially a midsummer insect, 

 material from southern Georgia shows that adults are not scarce 

 in that region as late as October, and that battered individuals are 

 found there, though rarely, as late as December. This ammophilous 

 insect is found in sandy situations over its range, from the ocean 

 beaches (where, however, it is rarely found and in few numbers) to 

 the waste land and river borders of the southern mountain valleys 

 and Piedmont region and far west of the area treated in the present 

 paper. It is most abundant, however, in the low country south of 

 North Carolina, and is everywhere to be found in the sandy regions 

 of southern Georgia and northern Florida. In extreme southern 

 Florida the species is decidedly scarce, a few specimens having been 

 recorded only from Key West. The most northeastern localities 

 at which the species has been found are Philadelphia Neck, Penn- 

 sylvania, and Maryland, though the occurrence of the species north 

 of southern Virginia is very exceptional. 62 



Trimerotropis saxatilis McNeill. 



Highlands, North Carolina, IX, 1906, 1 a", 1 9 . 



2 d\ 2 9, [U. S. N. M.]. Stone Mountain, Georgia, 1,000-1,686 



Rabun Bald, Georgia, 4,000-4,800 feet, feet, VIII, 3, 1913, (Bradlev, R. & H.), 



VIII, 21, 1913, (J. C. Bradley), 83 cf, 70 9 . 



The following notes were taken from observations made on Stone 

 Mountain, Georgia, a granitic knob rising abruptly 686 feet above the 

 surrounding Piedmont peneplain, which in this vicinity has a mean 

 elevation of 1,000 feet. U T. saxatilis found on bare granite slopes 

 where areas of lichens were the only vegetation to be found. The 

 northern face of the mountain is precipitous. The species was 

 plentiful about the gently rising slopes at the south base of the moun- 

 tain where the bare rock surfaces were first encountered, particularly 

 so in areas of rock fragments near the adjacent bunch grass vegeta- 

 tion. On ascending further the species was found less numerous, 

 becoming quite infrequent upon the bare rock areas on the slopes 

 clothed with open pine woods, but at the summit, where large bare rock 

 areas occupy the greater portion of the surface, the insect was again 



61 See Hebard, Ent. News, XXVI, p. 403, (1915). The south Florida species, 

 Trimerotropis acta, is there described and compared with maritima and citrina. 

 The misidentifications of that species, as maritima by Caudell, from Palm Beach, 

 and as citrina by Davis, in part, from Ocean Beach near Miami, are there cor- 

 rected. 



62 The record of this species from Lehigh Gap, Pennsylvania, applies to Sphar- 

 agemon saxatile planum Morse. See Rehn, Ent. News, XIII, p. 311, (1902). 



