THK MYRIAl'ODA OF N.UKTJ1 AMERICA. 37 



Type. U". S. Nat. Museum. 



Habitat. Indianapolis, Ind. 



Description of type. Brown, legs and under ])arts paler. Slender, 

 scarcely attenuated anteriorly, moderately .shining. First dorsal plate 

 transversely suboval, tubercles 10-6-8, seta^ tipped; lateral margin one- 

 toothed. Tubereulatlon of anterior segments rather indistinct, 4-4-(>; 

 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. 



Male: 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 P. incnuntann Lat/el. 



Length of $ 11.6""", width of first segment 1.1""", width of tenth, 

 1.3 1 "" 1 ; 9 length 8.5""", width of first segment, 8""", width of tenth 

 segment 1""". 



This species is very closely related to the European Polt/di'siitH.s in- 

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

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

 culation. 



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

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



6. Polydesmus branneri, sp. iiov. 



?." Polydesmus penn&ylvanicua Koch, Syst. d. Myr., 133, 1847 (Pennsylvania) ; Koch, Die 



Myriopoden, ii, IS, pi. Git, tiy. 14l>. 1SU3. 



l>ii/noKix. Very similar to Poli/<l<'*mn* wrrtttHx Say,* but body more 

 depressed and attenuate anteriorly; antenna' and legs more slender 

 and in the male less crassate. 



Type. U, S. Nat. Museum. 



llnhititt. Mossy ('reck, Jefferson County, Tenn. 



As the characters of /'. si'i-rntux vary exceedingly in respect to size 

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

 enough to distinguish /'. hntintrri from the various forms of /'. xnTiitit.s. 

 The most important differences by which /'. hritnin-ri is separated from 

 /'. xm-ittiiK are those of the male genitalia; but as it is almost impossi- 

 ble to give a good definition of these characters. 1 have thought it best 

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



Concerning the male genitalia of /'. wn-ittiis, 1 may say that in all 

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

 Pennsylvania, and North Carolina, I lindthat the characters are essen- 

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

 like spines. 1 have thought that /'. hrtinnrri may l>e identical with 



r<>li/<l<. swiff* xri-i-iiliis Say. .loiirn. IMiila. Arail. Nat. Sri., inc. is.'n /'. 

 Newport, Ann. and May. Nat. Hist.. L'<i:>. 1SIJ ( HudHoii's Hay) /'. <//"""'<'"' Koch, 

 Syst. <l. Myr., in.!. 1847 (North America). .' P. pennfylvanicus Koch. Syst. d. Myr., 

 133, 1847 (IViuisyh uuia;. 



