MILLIPEDS — HOFFMAN 205 



A species apparently very close to P. reirorsus, known from Knox County. 

 Tennessee. It seems distinct, however, in the details of the gonopods, although 

 these are of the same type. The two branches are more slender, and relatively 

 longer and closer together. The distal prongs of the outer branch form an acute 

 angle with each other instead of a very obtuse one or a semicircle, and the bent 

 portion at end of inner branch is shorter. 



The differences stipulated above are quite valid ones to distinguish 

 simulans from reirorsus, but no consideration was made, apparently, 

 of the pachydesmid previously known from southern Louisiana. The 

 three specimens I have seen from that area are all identical in gonopod 

 structure except for a slight variation affecting the secondary tibio- 

 tarsus in the type specimen of simulans (figure 9). This difference, 

 probably only an individual variation, is hardly of sufficient magnitude 

 to warrant recognition of simulans as a valid name. 



Distribution : Insofar as presently known, P. c. crassicutis is 

 restricted to the Gulf Coastal Plain in the vicinity of the Mississippi 

 Delta country. There are no definite localities known for Mississippi, 

 although the form certainly must occur there. Material has been seen 

 from the following localities: 



Louisiana. East Baton Rouge Parish: Port Hudson, 1 cf. Dr. Leavitt (MCZ)* 

 Ascension Parish: 4 miles north of Gonzales, 1 cf, Aug. 31, 1940, Stanley and 

 Dorothea Mulaik (RVC). Orleans Parish: Nev/ Orleans, 1 cf, H. E. Hubert 

 (MCZ). 



Mississippi. "E. Miss." with no further data, 2 cf d" (USNM). 



Pachydesmus crassicutis denticulatus Chamberlin 



Figures l,d, 8,(i. 



Fontaria crassicutis Bollman, 1888, p. 344. 



Pachydesmus denticulatus Chamberlin, 1946, p. 152, figs. 8, 9. — Chamberlin and 

 Hoffman, 1958, p. 43. 



Type specimens: Male holotype, female allotype, and two male 

 paratypes (RVC) ; from the vicinity of Atlanta, Ga., collected at in- 

 tervals between 1939 to 1943 by the late Prof. Perry W. Fattig. 



Diagnosis: A medium-sized subspecies of the crassicutis phratry 

 characterized primarily by the slender, sinuous secondary tibiotarsus, 

 which terminates in two equal-sized processes, and by the simple, 

 rather elongated coxal apophysis. The color in life is not known, but 

 is probably brown with yellow paranotal maculae. 



Variation: I have seen but a single specimen definitely referable to 

 this form, the paratype kindly loaned for study by Dr. Chamberlin. 

 The gonopods of this milliped appear to be identical in every respect 

 with those figured in the original description. The length of 47 mm. 

 cited for the holotype seems somewhat short in relation to the width 

 of 12.5 mm., suggesting that perhaps the caudalmost segments are 

 telescoped. The paratype examined measures 61 mm. in length and 

 13 mm. in width. The specimen recorded from Indian Springs, Ga., 



