NO. 1104. AMEHK'AN M EHOCII ICTA—VOnK. 4G3 



CYLIONUS GRACILIS (Humbert and Saussurc). 



SphwriodcsmuH (iramiin IIitmiikkt iiiul MAcmHiiuic, Kev.otMiix. Z<miI., IHfiO, p. II!); 

 Kfciuh'H Hiir loH M,vriup<)(l<;H, 1K72, p. 22, pi. i, ll);s. 2, 21. 



Type. — Siij)1)()H(mI to be, in I'iuis. 

 LovalUy. — ICaHteni cordUhMJi of Miixico. 



DIOSMONIDylC, new niimly. 



I><)(ly v<',iy HiiuUI, about lour times uh loii^ iis broad; dorHiiin vciiy 

 Htroiifily (!(»iiv<v\, tlu^ caiiiia' l)roiid, .sloping Honunvliat obliciuely down- 

 ward; Hiirlacc of Hc^MnciitH lincly liispid, IrunsviiiKcJy convex, or pro- 

 vided with atniuHverHerowof rounded elevatioiiH or conic tiibercIcH. 



An<(Miiiai rather robuHt, Kiibehiva.t<', tiie sixtli Joint diHtiiiclly hni;?er 

 and thiclair than tiie others, Joint.s li (o T) bein^ .sub«i(|nal in h'li^th. 



Second He},nn<!nt creHcentic, innch Knialicir than the hiterally ex]>aDded 

 and d('<;urved third Nejj^nuMit, whieli innch excM'edH all the others in si/e. 

 1'he fourth sej^nneiil has, hovv(;ver, the carina- lar^^crand more pi()<lu<',e(l 

 than the liftii and rolh)win^ segments, which is not tlie case in the 

 Cyclodesmiche. 



Lateral <;ariiue entire, Hubtrian^nhir, becoming (piadrate eaudad. 



Kepnt;nalorial pores, if present, situated in hirj;o, deep cavitii's at the 

 anterior shonhha' of the carina' at. base. These (lavilies are not known 

 in any other diplopo(hi. 



Snpph'ineiitaiy mar};in very short, <leHeal<^, and hyabiie. 



Last se;;ment8emienipti{!, somewhat h)nj'er than broad, several times 

 broader than the cariine of segment 19; the posterior margin forms an 

 even, tliin edge. 



Copuhiloiy legs lying almost in contact, consisting of a bitid, lobnst 

 ramus, and a, shfiMbM- simple attenuate process bearing tlie seminal <luet 

 and lying, when at rest, in a, groove along tlie mesial face of the larger 

 branch. 



DESMONUS, new qenu.s. 



Type. — DenmonuH enrlci, nrvv spcicies, from Alabama. 



Th(^ generic, characl(M-s ar<^ ineliide<l among those given for the fam- 

 ily. Should it be found necessary to as.sociati; here the genus (lyphodrH- 

 mm Peters, it may be distinguished by the much larger size, slighter 

 development of tJie carina- of the third segment, and larger tubc^-ch^s 

 of the transverse row 



DESMONUS liAKLKI, new Hpccies. 

 (I'liil,(» XXX II, li^H. Ia-1«. ) 



Type.—'Ho. OH!, IJ.9.N.M. 

 LomUty. — Auburn, A labaina. 

 Length, 7 mm.; width, 1.7 mm. 



