188 IJULLETIN 16, UNITED STATES NATIONAL MUSEUM. 



moderately ovate, the first four dorsal i)lates snialler than tln' siucee<l- 

 mg. Anal r,e<finent lar^^e, not tubereuhUe, inclosed between the lateral 

 «*arinaM)ti)enultiniate; anal valves smooth; anal scale absent. Lateral 

 carina' large, an<;ulated; the tifth deeply emarginate, bilobed. Repiig- 

 natorial jiorcs Ixnii on a ])edi«'el, placed on the anterior lobe of tifth 

 lateral carinas but supapical outhe rest, l^egs extending beyon<l sides 

 of body. 



And rof/Hd thus is closely allied to the E'lropean genus Dolistetius 

 Fanzago, but the later genus is sei)arated from Androf/nathim by the 

 form of the titth segment and of the rei)Ugnatorial pores. 



This genus contains the following species: 



Andrognathus corticarius. 



Antlro(in(iih>i8corthanuHCo\}e. Proc. Amer. Phil. Soc, 182, li^(\9 ( Moni<iom'r>i <<>., Vit.) ; 

 IJollnian, Ann. N. Y. Acad. Sci., 108, 1888 (Heaver Cr., Ttnu.). 



Yellowish brown, legs and under parts paler. Segments 40-60, first 

 four smaller tlian the succeeding. Lateral carinas strongly developed, 

 more aliform posteriorly. IJepngnatorial jiore large, placed on the 

 anterior lobe of tifth segment, bnt posterior and almost subapical on 

 the others. Male: Anterior legs with claws normal. Length of body 

 10-20""". 



Hahitat. — Montgomery Co., Va. (Cope); Mossy Creek, Strawberry 

 Plains, and Beaver Creek, Jellerson County, Tennessee. 



PLATYDESMUS. 



1843. — Plat If (learn us LiUCAH. Auu. 8o('. Ent. Prance, 51 {pohjdesmoidca). 

 1819. — PiextodenniHS Lucas. Rev. et Ma;ij. Zool., 589 (mori leti), 

 ISM.— Brachyei/be Wood. Proc. Phila. Acad. Nat. Sci., 187 (lecontei). 



Body wide depressed, elongate -oblong, covered with numerous short 

 hairs; convex above and below. Head not suctatorial nor concealed 

 by the first dorsal plate, densely pilose. Antenna* slightly clavate, 

 second article longest, bases remote. Ocelli absent. Mandibles small, 

 triangular, two-toothed and pilose on the inner side. 



Gnathochilarium well developed; stipes large, mala and teeth not 

 well «leveloped; hypostoma as in PseudoiJesmns; cardo present; men- 

 tum hammer-shaped; promeutum small, elongate orate; lingual i)lates 

 touching, lingual lobes distinct. Dorsal plates medianly suleate, with 

 two transverse rows of non-pilose tubercles. Lateral carina' large, 

 those of the first ten directed forwards. Anal segnu'iit tuberculate, 

 included between the lateral carinas of penultimate ; anal valves smooth ; 

 anal scale present. Repugnatorial pore beginning at fifth segment, and 

 nearer the anterior margin than the others. Legs not extending beyond 

 sides of body. 



l*l(tii/desmii,s^ rifstodetimus, und lira chycyhe agree in all points except 

 as to the x)ossession of ocelli — Piestodeamus has two, Platijdenmits one. 



