No. 8.— New Chilopods from Mexico and the West Indies. 
By Ratpsa V. CHAMBERLIN. 
SCOLOPENDROMORPHA. 
CRYPTOPIDAE. 
TIDOPS, gen. nov. 
Bopy 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’. simus, 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. 
