No. ,8. — New Chilopods from Mexico and the West Indies. 

 By Ralph V. Chamberlin. 



SCOLOPENDROMORPHA. 



CRYPTOPIDAE. 

 TIDOPS, gen.nov. 



Body composed of twenty-three leg-bearing segments. Eleven 

 pairs of elliptic spiracles, one pair being present on the seventh seg- 

 ment. 



Head overlapping the first dorsal plate. 



Antennae short, flattened; consisting of thirteen articles. 



Claws of prehensors dwarfed. None of joints of prehensors armed. 



Prosternum bearing two long dentiform processes. 



First dorsal plate with a transverse cervical sulcus. Other dorsal 

 plates longitudinally bisulcate; most of them also with distinct lateral 

 longitudinal sulci and, especially in the posterior region, with a median 

 keel more or less set off by furrows. Last dorsal plate laterally mar- 

 gined. 



Ventral plates with no distinct longitudinal furrows or sulci. 



Coxopleura extended caudad in a long, acutely one-pointed process. 



Tibiae unarmed or with only a subspinescent bristle at distal end. 

 Tarsi, excepting of last two pairs of legs, undivided. Tarsus of four- 

 teenth legs biarticulate. 



Prefemur of anal legs armed ventrally; femur, also armed ventrally 

 or mesally with spinules; tibia unarmed. Tarsus many jointed as in 

 Newportia; clawless. 



Genotype. — T. sirnus, sp. nov. 



This interesting genus is manifestly very close to Newportia, to 

 which its relationship is suggestive of that of Paracryptops to Cryp- 

 tops. The agreement of Tidops with Newportia will be particularly 

 noted in the possession of a many jointed tarsus on the anal legs, this 

 feature separating these two genera from all other Cryptopidae. 

 Tidops is at once to be distinguished from Newportia by its dwarfed 

 prehensorial claws, the strongly developed prosternal dental processes, 

 the thirteen-jointed antennae; and the characters of the ventral 

 plates. Only the type species is known. 



