170 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Analysis of the species of Theatops. 



a. Femora of anal legs unarmed ; none of the tibial or tarsal joints armed above ; all 

 tarsal joints armed beneath, except the last two Posticus. — 2 



aa. Femora of anal legs with one or two spines at their superior interior angle ; tibia?, 

 except the last three, armed above; all tarsal joints except the last two armed 

 above and beneath; first tarsal joint of first pair of legs unarmed be- 

 neath Spinicauda.— 3 



2. Theatops posticus. 



1821. — Cryptops postica Say. Journ. Acad. Nat. Sci. Phila., 112 (Georgia and Floriaa) ; 



Say, Amer. Ent., 24, 1822; Gervais, Ann. Sci. Nat., 51, 1837; Newport, Ann. 



& Mag. Zool., 100, 1844; Koch, Syst. Myr., 175, 1847; Gervais, Apteres, iv, 



294, 1847. 

 1844. — Theatops postica Newport. Trans. Linn. Soc, 410, 1844; Newport, Cat. Myr, 



Brit. Mus., 71, 1856; Wood, Journ. Phila. Acad. Nat. Sci., 37, 1862; Wood, 



Trans. Amer. Phil. Soc, 171, 1865; Kohlrausch, Archiv Naturg., 93, 1881; 



Pocock, Ann. & Mag. Nat. Hist., 289, 1888. 

 1862. — Opisthemega postica Wood. Journ. Acad. Nat. Sci. Phila. , 35 ( Goldsboro, N. C); 



Wood, Trans. Amer. Phil. Soc, 169, 1865; Kohlrausch Archiv Naturg., 



130, 1881; Underwood, Ent. Amer., 64, 1887. 

 1886. — Opisthemega crassipes Meinert. Proc Amer. Phil. Soc, 209 (Jacksonville, Fla.; 



Pennington's Gap, Ya.; Bee Spring, Ky.); Meinert, Myr. Mus. Haun., Ill, 35, 



1886 (Biloxi, Miss.); McNeill, Proc. U. S. Nat. Mus., 326, 1887 (Pensacola, 



Fla.); Underwood, Ent. Amer., 64, 1887. 

 1888. — Theatops crassipes Bollman, Ann. N. Y. Acad. Nat. Sci., 110 (Beaver Creek, 



Tenn.). 



Habitat. — East of the Mississippi Eiver, 1ST. to Virginia, Indiana, and 

 Illinois. 



Etymology: Lat., posterior. 



A comparison of northern and southern specimens shows several dif- 

 ferences as in Scolopocryptops sexspinosus. 



3. Theatops spinicauda. 



1862. — Opisthemega spinicauda Wood. Journ. Acad. Nat. Sci. Phila., 36 ( Cook Co., III. ) ; 



Wood, Trans. Amer. Phil. Soc, 170, 1865 (Illinois; Allegheny Co., Pa.); 



Kohlrausch, Archiv f. Naturg., 136, 1881; Meinert, Proc. Amer. Phil. Soc, 208, 



1886 (Acapnlco, Hex.); Underwood, Ent. Amer., 64, 1887. 

 1888. — Theatops spinicaudus Bollman. Ent. Amer., 6 (Little Pock, Arkadelphia, Oko- 



lona, Muddy Fork, and Ultima Thule, Ark.). 



Habitat. — Southwestern United States S. to Acapulco, Mexico; N. 

 through Illinois to Chicago; E. through Tennessee to the mountains, 

 and then K. to Allegheny County, Pa. 



Etymology: spina, spine; cauda, tail. 



Subfamily III. — Scolopendridje. 



1844. — Scolopendrinw Newport. Trans. Linn. Soc, 378. 



1844. — Heterostominai Newport. 1. c, 244. 



1844. — Cormocephalhxo' Newport. 1. c, 419. 



1847. — Scolopendrides cribriferes Gervais. Apteres, 243 'and 244. 



1847. — Scolojiendrides morsicantes Gervais. Apteres, 243 and 258. 



