1916.] NATURAL SCIENCES OF PHILADELPHIA. 277 



The species appears to be one of the more abundant, if not the 

 most abundant, of the genus found in the eastern United States. 

 In the southeastern States it has, as far as known, a very limited 

 distribution, not having been taken south of Orange, Virginia. 



GRYLLIDiE. 



Gryllotalpa hexadactyla Perty. 



1838. Gr[yUotalpa] borealis Burmeister, Handb. Entom., II, Abth. II, pt. 1, 

 p. 740. [North America.] 



Maryland. Marietta, VII, 27, 1903, (A. P. Morse), 



Bohemia Bridge, Cecil County, V, 30, } 9 - ,„ ,. Iir rtft ,„„ 



L914, (II. W . Fowler), 3 9, [A. X. Atlanta, \ I, 26 to VIII, 28, 190«.) to 



S. P.], brachypterous. 1912 > 3 9,1 juv., [Ga. State Cln.], 



2 brachypterous. 



District oj Columbia. Billy's Island, Okeefenokee Swamp, 



Washington, IV, 20, 19, [Hebard VI, 1912, (J. C. Bradley), 19, 



Cln.], brachypterous. brachypterous. 



Georgia. Florida. 



Rabun County, VII, 1910, (W. T. Enterprise, IV, 17, (P. Laurent), 1 d\ 



Davis), 3 juv. 132 [Hebard Cln.], brachypterous. 



Lavender, 1 cr, [Ga. State Cln.], Lake City, 1 9, [Hebard Cln.], bra- 



brachypterous. chypterous. 



After careful examination of material from many localities in 

 America, extending from the United States southward to the southern 

 borders of tropical South America, we find that there is no valid 

 ground for separating Burmeister's borealis from hexadactyla of 

 Perty, described in 1832 from Almas Geraes, Brazil. 133 Few compari- 

 sons are to be found between these supposedly distinct forms, Saus- 

 sure and Scudder giving as differences the somewhat smaller size of 

 hexadactyla and the more rounded projection at the base of the second 

 lateral dactyl of the cephalic tibise. The series before us show that 

 the insect attains its greatest size development in the United States, 

 but that little constancy exists is also demonstrated, as specimens 

 from the same locality in several cases show almost the maximum 

 difference in size found in the entire series before us, which numbers 

 considerably over one hundred specimens. The rounded chitinous 

 projection at the base of the second lateral dactyl of the cephalic 

 tibise is normally rounded, but is often worn down to a more or less 

 angulate condition and is naturally valueless as a character in this 

 respect. No other differences exist between North and South 

 American examples, and borealis as a result falls into the above 



132 Two of these individuals are in the very early stages and the smallest of 

 these has three, instead of four, tibial dactyls. In three other specimens in the 

 same instar before us, this remarkable feature is also found. 



133 Delect. Ann,,. Art. Brasil., p. 119, pi. 23, fig. 9, (1830-34). 



19 



