28 ACADEMY OF NATURAL SCIENCES 



tudinally oblong-oval, elevated, obtuse, approximate and arranged 

 transversely in about four nearly regular series, anterior segment 

 transversely oval, narrower tban the head or second segment ; 

 stigmata elevated. 



Found in Pennsylvania. [108] 



Genus POLLYXENUS Latr. 



Body membranaceous, pennicillate with setae at tip ; antennae 

 inserted under the anterior margin of the head. 



P. FASCICULATUS. — Body pale brown, linear, incisures ciliated 

 fasciculated each side ; head deeply ciliated before. 



Inhabits the Southern States. 



Segments smooth, ciliate at the incisures, and fasciculate with 

 brown setae each side, terminal pencil cinereous ; head semior- 

 bicular, depressed, deeply and densely ciliated on the edge with 

 setge : eyes small, oval, prominent, placed obliquely in the middle 

 of the lateral margin ; antennae very short, thick reddish-brown ; 

 feet white. 



Length rather more than one-tenth of an inch. 



Beneath stones, &c., in humid situations; not very common. 



Order 2. SYNaNA TEA. 



Genus LITHOBIUS Leach. 



Antennae conico-setaceous : dorsal scuta alternately much 

 shorter and concealed. 



L. SPINIPES. — Joints of the feet with short spines at tip, and 

 a single much longer one beneath the tips. [109] 



My Cabinet. 



Body chestnut brown, polished, impunctate, with short sparse 

 hairs ; segments with reflected lateral edges, first one shortest, 

 transverse, the second quadrate with narrowed angles, five or six 

 posterior ones, each narrowed behind and emarginate on the hind 

 edge, the posterior angles of those near the caudal segment more 

 acute, caudal segment truncate conico-cylindric ; antennae pale 

 testaceous, with dense, very short, rigid hair; terminal joint as 

 long as the two preceding ones conjunctly ; feet pale testaceous, 

 joints spinous at tip, an elongated spine at the tip of each be- 



[Yol. II. 



