THE MYRIAPODA OF NORTH AMERICA. 169 



Genus I. — Cryptops. 



1844. — Cryptops Leach. Trans. Linn. Soc, 384 (hortensis). 



Type. — Cryptops hortensis Leach. 



Etymology — Kpvnroz, concealed; coif:, eye. 



This genus contains the following" North American species: 



1. Cryptops hyalinus. 



1821.— Cryptops hyalina Say. Journ. Acad. Nat. Sci. Phila., in (Florida); Say, 

 (Euvres Ent., sp. 3, 1822; Newport, Trans. Linn. Soc, 409, 1844; Newport, 

 Cat. Myr. Brit. Mus., 60, 1856; Wood, Jour. Acad. Nat. Sci. Phila., 34, 1862; 

 Wood, Trans. Araer. Phil. Soc, 168, 1865; Underwood, Ent. Arner., 65,1887. 



1847. — Cryptops hyalinus Koch. Syst. Myr., 175 ; Gervais, Apteres, IV, 293, 1847 ; Kohl- 

 rausch, Archiv f. Naturg., 129, 1881; Bollman, Ann. N. Y. Lye Nat. Hist., 

 107, 111, 112, 1888 (Knoxville, Beaver Creek, and Mossy Creek, Tenn.); Boll- 

 man, Ent. Araer. 6, 1888 (Little Rock, Arlcadelphia, Okolona. and Ultima 

 Thule, Ark.). 



1847. — Cryptops milberti Gervais. Apteres, IV, 592 (New Jersey). 



1862. — Cryptops milbertii Wood. Journ. Acad. Nat. Sci. Phila., 34; Wood, Trans. 

 Arner. Phil. Soc, 168, 1865; Underwood, Ent. Amer., 65, 1887. 



1867. — Cryptops aspenpes Wood. Proc Acad. Nat. Sci. Phila., 129 (Montgomery Co., 

 Fa.); McNeill, Proc U. S. Nat. Mus., 326, 1887 (Pensacola, Fla.); Under- 

 wood, Ent. Amer., 65, 1887. 



1886. — Cryptops sulcatus Meinert. Proc. Arner. Phil. Soc, 211 (Bee Spring, Ky.); 

 Underwood, Ent. Amer., 65, 1887. 



Habitat. — Eastern United States N. to New Jersey, Pennsylvania, 

 and Indiana, and W. to Indian Territory. 



Etymology — Lat., of glass. 



For a. description of this species see that of sulcatus Meinert. 



Underwood in his synopsis of the species of this genus has regarded 

 milberti, asperipes, and sulcatus as valid species, but it seems to me that 

 they are all identical with hyalinus. I have examined a large amount 

 of material from nine different States and have been able to find only 

 one species. 



Genus II.— THEATOPS. 



1844. — Thealops Newport. Trans. Linn. Soc, 410 (postica). 



1862. — Opisthemega Wood. Journ. Acad. Nat. Sci. Phila., 35 (spinicauda). 



Type. — Cryptops postica Say. 



Etymology: Hear))?:, a spectator; oo^'i an eye. 



A recent examination of the type of Cryptops postica Say, which is de- 

 posited in the British museum, by Mr. R. Innes Pocock,* has proven 

 that Newport was mistaken as to Say's species having eyes. The 

 elimination of this character makes Theatops identical with Opis- 

 themega; but as the former is oldest it must be used in place of the lat- 

 ter, notwithstanding the fact that it is based in part upon an erroneous 

 character. This conclusion was published by me some time before Mr. 

 Pocock's paper appeared (T. crassipes Bollman, Am. N. Y. Lye. N. H., 

 110, 1888; T. spinicaudus Boll., Ent, Amer., 6, 1888). 



*Pocock, Ann. & Mag. Nat. Hist., 283-290, 1888. 



