170 BULLETIN 46, UNITED STATES NATIONAL MUSEUM. 



Analysis of the species of Theatops. 



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

 tarsal joints armed beneath, except the ]ast two POSTICTJS. 2 



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

 except the last three, armed above ; all tars..l 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 Florida) ', 



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. Ainer. 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. Opisthemcfia crassipcs Meinert. Proc. Amer. Phil. Soc., 209 (Jacksonville, Fla.; 



Pennington's Gap, Va.; Bee Sprint), 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 (Bearer Creek, 



Tenn.). 



Habitat. Bast of the Mississippi Biver, N. to Virginia,- Indiana, and 

 Illinois. 



Etymology: Lat., posterior. 



A comparison of northern and southern specimens shows several dif- 

 ferences as in Seolopocryptops 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; AUe/jhnnj Co., Pa.); 



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



1886 (Acapulco, Mex.); Underwood, Ent. Amor., 64, 1887. 

 1888. Theatops spinicaudiis Bollman. Ent. Amer., 6 (Little Hock, Arkadelpli'nt, <>ko- 



lona, Muddy Fork, and Ultima Tliulc, .-Irk.). 



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

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

 and then N. to Allegheny County, Pa. 



Etymology: spina, spine; cauda, tail. 



Subfamily III. SCOLOPENDRID^E. 



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



1844. Heterostomiiiai Newport. 1. c., 244. 



1844. Cormocrplmlina' Newport. 1. c., 419. 



1847. Scolopendrides eribriferes Gervais. Apteres, 243 and 244. 



1847. Scolopendrides morsicantes Gervais. Apteres, 243 and 258. 



