620 NEW SPECIES OF MYRIAPODS. 



Habitat. — Indianapolis, Ind. 



Description of type. — Brown, legs and nuder parts* paler. Slender, 

 scarcely attenuated anteriorly, moderately shining. First ilorsal plate 

 transversely snboval, tubercles 10-0-S, setai tipped; lateral margin one- 

 toothed. Tuberculation of anterior segments rather indistinct, 4-4-6; 

 posteriorly the first row is more obliterated, the second is usually com- 

 posed of six tubercles, and those of the last row are acute and project 

 beyond posterior border of segment; lateral margins three or four 

 toothed. Legs long. 



IMale : Legs strongly crassate, last four joints tuberculate beneath ; 

 coxa of second pair much produced and the end of lobe pitted ; femur 

 not much swollen above; genitalia very similar to F. inconsfans Latzel. 



Length of S 11. 0""", width of first segment 1.1""", width of tenth 

 1.3""" ; 9 , length 8.5""", width of first segment .8""", width of tenth 

 segment 1'"'". 



This species is very closely related to the European rolydesmus in- 

 constans Latzel, as is shown by the tuberculation and the form of male 

 copulation foot, while it only resembles P. moniliaris Koch in tuber- 

 culation. 



I have examined a male and a female, collected by Mr. Frederick C. 

 Test, mj' friend and fellow-student, for whom the species is named. 



6. Polydesnius braiineri, sp. uov. 



?? Polydcsmus jx'iiiisuh'anicits Koch, Syst. d. Myr., 133, 1S47 (Pcnusylvauia) ; Koch, Die 

 Myriopoden, ii, 18, pi. GO, lig. 142, 1803. 



Diagnosis. — Very similar to Poly desm us serrafus Say,* but body more 

 depressed and attenuate anteriorly; antennae and legs more slender 

 and in the male less crassate. 



Type.—V. S. Nat. Museum. 



Habitat. — Mossy Creek, Jefferson County, Tenn. 



As the characters of F. serratiis vary exceedingly in respect to size 

 and form, I have had considerable trouble in usiug characters exact 

 enough to distinguish F. branneri from the various forms of P. serratus. 

 The mostimi)ortant dilTerences by which F. branneri is se[>arated from 

 P. serratns are those of the male genitalia; but as it is almost impossi- 

 ble to give a good definition of these characters, I have thought it best 

 to say nothing now, but wait until I can have good figures made. 



Concerning the male genitalia of F. serratus, I may say that in all 

 the specimens I have examined from Minnesota, Illinois, Indiana, 

 Pennsylvania, and North Carolina, I find that the characters are essen- 

 tially similar, the only important variation being in the number of plate- 

 like spines. I have thought that P. branneri may be identical with 



Toli/dcamus serratus Say, Journ. Pliila. Acad. Nat. Sci., lOG, 1820. = P. canadensis 

 Newport, Ann. and Mag. Nat. Hist., 20."), 1844 (Ifndaon's Bay). = A f/laiicesevs Koch, 

 Syst. d. Myr., 133, 1847 (North America). ? r.peniisi/Jranicus Koch, Syst. d. Myr., 133, 

 1847 (Pennsylvania). 



