Mr* R. I. Pocock on the Genus Tlieatops. 285 



" Cryptops (Leach). 



" Anterior margin of labium not denticulated ; eyes obsolete ; 

 posterior pair of feet longest, basal joint unarmed. 



" Cryptops post tea. 



'' Terminal segment of the body longest ; posterior feet very 

 short and robust. 



" Inhabits Georgia and E. Florida. 



" Body rufous, paler beneath, punctured ; segments with two 

 impressed longitudinal lines above and a deeply impressed 

 one beneath ; ultimate segment longer than the two preceding 

 ones conjunctly, Avith two obsolete impressed abbreviate lines 

 at the base and an intermediate more distinct continued one. 

 Posterior feet remarkably robust, hardly longer than the 

 ultimate segment ; nail remarkably robust, as long as the two 

 preceding joints conjunctly. 



" A very remarkable species, distinguished at once from all 

 others by the very thick and short posterior pair of feet, the 

 nails of which cross each other and are much used by the 

 animal in its defence." 



Of this species one specimen was, according to Newport, 

 sent by Say to Dr. Leach, and by him it was placed in the 

 British Museum. 



In 1844, Newport examined this specimen, and published in 

 the Trans. Linn. Soc. xix. p. 409, the following description 

 of it :— 



" Genus Theatops, Newp, 



^' Ocelli distincti. Antennce breves, subulatte, 17-articulatoe. Seg- 

 mentum cephcdicum truncatnm subimbricatum ; margine labiali 

 denticulato. Pedum iwstremorum articulo magno, obconico, 

 abbreviato. Pedum paria 2L Appendices anales latercdes 

 obtusse. 



" This genus is perfectly distinct in the form of the head and 

 the short antenna from the true Scolopendrm, in the structure 

 of the respiratory organs from the Heterostomin.ee, and in the 

 number of legs from Scolopenelropsis ; while it approaches 

 Cryptops, but differs also from that genus in the distinctness 

 of the ocelli and in the possession of labial teeth. 



"1. Theatops posttca. 

 " Aurautiaea, ocellis inconspicuis lateralibus, dentibus 8 minutis, 

 Ann. & Mag. N. Hist. Ser. 6. Vol.i. 20 



