THE MYKIAPODA OF NORTH AMERICA. 179 



A careful rxiuiiiniitioii of two siKjciiiinis of sersitinnstis fioiu Clu'ha- 

 lis, VV. T., proves, as Dr. Wood lias previously shown, that the wcsteru 

 and eastern specimens sh()ul(H)esei»arate«l. The main ditfereiire lies 

 in the hirsutenessof the first aiitennal joints; t he ditfeiences mentioned 

 by Wood are hardly sutliciently distin(;t to separate tlu^ two forms. * 



15. Scolopocrytops nigridiuB. 



1887 — SrolopnirnplojiMnigridiimyU'SiiU. I'ro<-. T. S. \iit. Miis. ,.'{;>:!( /.7()oh»;h///o«, Intl.); 

 Holliiiau, Auu. N. Y. AcjhI. N;it. Sci., 1(»7, IXSH {Ktiojvilh. Tnni.); n..lliii:iii, 

 ihid., 110 {lieanr Cr.. Tinn.): Bonmaii, ihid., 112 {Mosnif Cr., Tenn.). 



JI(ihit((t. — Mononjiiihela City, Pa.; r>Ioomin<;ton, Greencastle, Salem, 

 Indiana; Chapel Hill, N. (J.; Heaver Creek, Mossy ('reek, Knoxville, 

 Tenn. 



Utymolofiy. — Latin, blackish. 



For the sake of comi)leteness 1 j;iv«' the followinjj^ description of ni- 

 griiliHs. 



Head, antennae, tii'st and last dorsal segments reddish brown; other 

 parts jiTeenish brown ; lej;s paler, with the femoral and til»ialJointsof the 

 posterior pairs turciuoise-gfreen beneath, ^foderately robust; si>arsely 

 pilose; rather densely putu-tate, especially on head. Antenna' rather 

 short, articles rather lon<j, all e.\ce})t the lirst two densely hirsute. 

 Coxa^ of prehensorial legs strongly callous, sinuate; coxal tooth short 

 and blunt. Anal legs short, tarsi densely pilose as in f/niclUs; infe- 

 rior si)iiu! large, interior small. Taisi of anal and penultimate pairs of 

 legs unarmed, second tarsal joint, except thai of the last four pairs of 

 legs, armed abov^e. All the dorsal plates except the first three margi- 

 nate; two indistinct short sulci on the posterior part of the segment. 

 Anal pleura* scabrous, densely ]>orous; s[)in<i large, robust. Anal 

 sterna wi<le, sides slightly rounded, ])osterior margin cmaiginate. 

 Length 25-40"""; length of anal legs G-0 



This is the species mentioned by ('ope (Proc. Amer. Phil. Soc, 170, 

 1860) as an undescribed /Scohtpocryptops with a ^'- (jt'ceiiis/i body and a 

 reddish kaadj'^ 



16. Scolopocryptops gracilis. 



lSG2.—ScoIopo(T!ipfo2)ii {iraciVm Wood. .Joiiru. Aciul. Nat. St-i. Phila., :>S (Ft. Tvjon, 

 Cdl.); Wood, Trans. Aiuer. Phil. 8oc., 173, 18tJ5. 



1862. — Scolopocrtiptops la»atipe8 Wood. .loiirn. Acid. Nat. Sci. Phila., ;>!> tJaUfoniia); 

 Wood, Trans. Amer. Phil. Soc, 175, 1S6.5; Kohlrausch, Archive Natiirg., 

 56, 1881; Underwood, Ent. Amer.. 62, 1X87. 



1870. — Scolopocffiptops caUfornica Hnnibert & Saussurc. Rov. &, Mag. Zool., 204 {Cal- 

 ifornia} ; Humb. & Sanss., Miss. 8ci. Mcx., 1872. 



Habitat. — Upper and Lower California. 



Etymology. — Latin, slender. 



Recent writers have used the name lanatipcfi for this species; but, as 

 gracilis preceded lanatipcs in Wood's monograph, it should be em- 

 l)loyed. 



