AMERICAN MYRIAPODA. 65 



On some new and little known MYRIAPODA from the Southern AUeghenies. 



BY E. I). COPE. 



PETASERPES, Cope. 

 Head concealed to the bases of the antennae by the shield-like expan- 

 sion of the scutum of the first anuulus. Ocelli two, beneath the mar- 

 gin of the same, and at the approximated bases of the antennas. Latter 

 large, stout, hairy, six-jointed. Annula3 without lateral processes, each 

 with two pores, forming two rows on each side of the body. 



Petaserpes rosalbus, Cope. 



The sagments of the body are flattened below, and gently convex 

 above. Their lateral expansion is a little greater than the length of 

 the extended feet. Each has a delicate impressed line near the poste- 

 rior margin, which passes round the extremity, producing the semblance 

 of a longitudinal angle. The extremital margins are entirely continu- 

 ous. The transverse diameter contracts very rapidly at both extremi- 

 ties, and the anal annulus and head, are relatively exceedingly small. 

 The basilar segment is semidi.scoid, and forms the segment of a hollow 

 sphere. The anterior aspect is horizontal, and has a delicate marginal 

 rim. The head is inferior, and has the short conic form of Octorjiena, 

 Wood. The mouth is situated near the extremity of a cone, and not 

 of a rather flattened muzzle, as in the Andrognathidae; there are hairs 

 scattered about it and the sides of the head. The antennae are of re- 

 markable size for the head, and originate near together just at the in- 

 ferior margin of the basilar segment. Just within and above them at 

 their base is situated on, each side a short cresccntic ocellus or ag"^re- 

 gate of ocelli, whose superior extremity is concealed by the margin of 

 the basilar segment. In one specimen each of these presents a rugose 

 surface, and in another seems to be divided into four ocelli, perhaps by/ 

 the accumulation of a light colored deposit between the elevations. 

 The antennae possess six joints, of which the antepenultimate are a 

 little the shortest. They become successively stouter towards tlie cx- 

 cxtremity of the antennae, and are all (juite hairy. 



The reproiluctive organ of the male is a subglnbular body on a short 

 pedicel, hairy except the convex extremity, which is smooth. On the 

 inner side two short pedicels support, each, a short curved spiuC; one 

 curved backwards and another forwards. 



The annuli are smooth. The anal annulus is small, and for the 



THAN-S. AMER. EST. SOC. (9) MAY, 1870. 



