-46— 



This genus is related to Polydesmus and Scyionoius, but can be easily 

 separated by the character of the dorsal plates. 



2. Chaetaspis albus, sp. nov. 



White throui^hout. Slender, small, slightly acuminate Ijefore. Antennae exceed- 

 ing the width of body, subclavate. First dorsal plate large, semicircular, angles not 

 produced, provided with five rows of hairs. Other dorsal plate with the posterior 

 angles a little produced, lateral margins with 3 — 4 setigerous teeth ; rows of hairs 2 

 to 3. Feet rather long, r^ Qrassate, Q slightly crassate. r/" copulation foot erect, 

 not as in ]\ilydcsmus ; composed of two pieces, the outer curving outwards and then 

 inwards, so that the ends almost touch over the median line of body, rather robust, 

 somewhat flattened, the end apparently divided into three pieces — ^a small lobe, fol- 

 lowed by a long and slender one with the end turned sharply downwards and this by 

 a large, flat bifid piece ; inner piece narrow and thin, sickle shaped, the end curv- 

 ing up between the branched lobe of the outer piece ; coxa" with a few long hairs. 

 Seventh dorsal plate enlarged. 



Length of body 6 — 7.5 mm.; width .3 — .5 mm. 

 Hab. Bloomington, Indiana. 



I have examined 4 9 9 ^"<^ 3 <^S'- ^^ seems to be more underground 

 in its habits than the other species of this family known to me, I have al- 

 ways found it under logs buried rather deep in the ground. I thought 

 at first this may be the young of some other Polydesjnidce, but having 

 found several males and taken a pair in the act of copulation, I have de- 

 cided that it must belong to a new genus. 



Genus III. SCYTONOTUS, Koch. 



3. Scytonotus cavernarus, s]:). nov. 



Allied to nodiilosiis Koch. Pure white throughout. Slender, somewhat depressed, 

 acuminate anteriorly. Antenna; exceeding the width of body, clavate. First dorsal 

 plate elliptical, angles sharp ; scales arranged in five, transverse series, anterior row 

 sharp, setigerous, all covered with fine granulations. Other dorsal plates with all the 

 lateral sides sharply and deeply four or five toothed, scales arranged in four rows, the 

 posterior row more or less setigerous, on the posterior segments the anterior row is not 

 very distinct. Repugnatorial pore scale large and swollen. Legs moderately long 

 and slender. 



Length of body 11 nun.; width 1.5 mm. 



Hab. Mayfield's Cave, Bloomington, Indiana. 



This species is described from one female found crawling on the floor 

 of the above cave, in October, 1886. As already stated, this species is 

 more nearly related to nodulosus, but as granulatus is the only species 

 found so far in the vicinity of Bloomington, I suppose it is descended 

 from pranulahis. 



