MORSE: ORTHOPTERA OF NEW ENGLAND. 425 
Oedipodinae: Saussure, H. de., " Prodromus Oedipodiorum," Geneva, 254 
pp., 1 pi. (1884) and "Additamenta ad Prodromum Oedipodiorum," 
Geneva, 180 pp., 1 pi. (1888). A classic and still valuable work on this 
subfamily. — McNeill, J., "Revision of the Orthopteran genus Trimero- 
tropis." Proc. U. S. Nat. Mub., vol. 23, p. 393-449 (1901). 
Loctjstinae: Scudder, S. H., "Revision of the Orthopteran group Melan- 
oph," etc. Proc. U. S. Nat. Mus., vol. 20, p. 1-421, pi. 1-26 (1897); 
"Supplement to a Revision of the Melanopli." Proc. Davenport Acad. 
Nat. Sci., vol. 7, p. 157-205, pi. 7-9 (1899). 
Acrydiinae: Hancock, J. L., "The Tettigidae of North America." 188 pp., 
11 pis. (1902). 
Many faunistic papers published since 1900, on the Orthoptera 
of particular districts, notably those by Caudell, Davis, Fox, 
Morse, and especially Rehn and Hebard, as well as purely system- 
atic ones by the same authors, also contain notes on the taxon- 
omy of various species and genera of the family. 
Key to Subfamilies of New England Acrididae. 
A. Pronotum of normal size, not covering the abdomen. Claw-pads (pul- 
villi) present between the tarsal claws. All tarsi three-jointed. 
B. Prosternum not spined, — flat, convex, or at most with an obtuse tubercle. 
C. Hind margin of pronotum not or but Uttle produced, — ^truncate, con- 
vex, or very obtusely angulate. Disk of pronotum without high 
median carina. Face usually retreating, and angulate at junction 
with vertex. . . .Slant-faced Locusts, Acridinae {Tryxalinae), p. 425. 
CC. Hind margin of pronotum strongly produced, — acute, right-angled, 
or nearly so. Pronotmn usually with distinct median keel. Face 
usually nearly vertical, and rounded at meeting with vertex. 
Band-winged Locusts, Oedipodinae, p. 447. 
BB. Prosternum with a prominent conical or cylindrical spine projecting 
ventrad to the level of the distal end of the coxa. 
Spine-breasted or Spur-throated Locusts, Locustinae (Acridiinae) , 
p. 480. 
AA. Pronotum covering all or nearly all of the abdomen. Claw-pads absent. 
Front and middle tarsi two-jointed, hind tarsi three-jointed. 
Pygmy Locusts, Acrydiinae (Tettiginae), p. 525. 
SLANT-FACED LOCUSTS; MEADOW LOCUSTS— ACRIDINAE {Tryxa- 
linae of authors). 
The most noticeable peculiarity of the members of this sub- 
family is the strongly retreating face and projecting vertex, the 
latter being nearly horizontal and its plane meeting that of the 
face at an acute angle. The prosternum lacks the prominent 
spine characteristic of the Locustinae (Acridiinae) though in two 
