MILLIPEDS — HOFFMAN 199 



6. Prefemoral process heavy, very thick in the region of its angulation, distally 



almost straight; subterminal tooth of secondary tibiotarsus smaller; coxal 

 apophysis smaller; length, 55 to 64 mm. (east-central Tennessee). 



crassicutis laticollis (Attems) 



Prefemoral process slender throughout, distally sinuate subterminal tooth of 



secondary tibiotarsus larger; coxal apophysis larger; length, 71 to 73 mm. 



(central Alabama) crassicntis hubrichti, new subspecies 



7. Tip of secondary tibiotarsus directed distad, the entire process nearly stnxight, 



broader, and strongly twisted at about the midlength; length, 69 to 70 mm. 

 (northern Alabama, eastern Tennessee). 



crassicutis retrorsus Chamberliu 



Tip of secondary tibiotarsus directed proximad, the entire branch more slender 



and bisinuate, slightly twisted near its base; length, 69 mm. (southern 



Alabama) crassicutis adsinicolus, new subspecies 



The crassicutis phratry * 

 Pachydesmus crassicutis crassicutis (Wood) 



Figures l,a, 7,a, S,a, 9 



Polydesmus crassicutis Wood, 1864, p. 7; 1865, p. 224, fig. 55. 



Pachydesmus crassicutis Cook, 1895, p. 5. — Pocock, 1909, p. 188. — Attems, 1938, 



p. 153, fig. 174. 

 Fontaria crassicutis Broleraann, 1900, p. 101, pi. 6, figs. 28, 29. 

 '^.Fontaria louisiana Chamberlin, 1918a, p. 363 (Covington, La., type apparently 



lost). 

 Pachydesmus simulans Chamberlin, 1942, p. 4, figs. 9, 10 (Gonzales, Ascension 



Parish, La. ; type in Chamberlin collection) . 



Type specimens: Wood's type series consisted of "numerous" 

 specimens from Mississippi, and was borrowed from the Smithsonian 

 Institution. No labeled material now appears to be extant, but in 

 the U. S. National Museum collection are two very old fragmented 

 specimens labeled only "E. Miss.," which may be remnants of the 

 types. Unfortunately the gonopods are lost from both. 



Diagnosis: A medium-sized pach3^desmid (55-65 mm. in length) 

 in which the leading edge of the primary tibiotarsus is serrate and 

 the apices of the secondar}^ tibiotarsus arc unequal in length and 

 directed divergently distad. 



Description: Male specimen from Port Hudson, La.: length about 

 53 mm., width, 11.5 mm. 



Front of head smooth and polished, evenly convex, with a small 

 indistinct triangular flattened area between and below the antennal 

 sockets. Genae large, extending slightly beyond edge of head cap- 

 sule, each with a median impression. Vertigiai groove distinct, ter- 



' The term "phratry" is here Introduced (to the best of my knowledge for the first time) to designate 

 3 group of closely related subspecies which appear to form a natural group definftblo by several characters. 

 Since most of the subspecies of P. crassicutis are quite similar in structural characters, it seems adequate 

 to Introduce e.;tended descriptions only of a representative of each phratry. 



The terms "group" and "section" appear to be more useful to designate assemblages of species below 

 the level of, or In place of, the subgenus category. 



