12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Scolopocryptops (formerly Otocryptops, see Crabill, 1953, p. 96): 

 Represented by at least five species, it is the most widespread scolo- 

 pendromorph genus of North America; east of the Mississippi its mem- 

 bers are among the most commonly-encountered centipedes. Indeed, 

 in the East from Massachusetts to the Gulf of Mexico, one can 

 hardly overturn many logs and rocks without discovering specimens 

 of the large orange or red-orange sexspinosa. Again, we do not know 

 much about the genus in the Far West ; viz, gracilis Wood is common 

 in California but has also been reported from Texas, while a presumed 

 subspecies, g. peregrinator (Crabill) (1952, p. 124), is common in 

 montane Virginia and has been taken in Maryland and Pennsylvania; 

 munda Chamberlin, is known only from Kendrick, Idaho (possibly 

 an intraspecific variant of gracilis) ; sexspinosa (Say) is the commonest 

 eastern species, but west of the Rocky Mountains it is known from 

 Alaska, Vancouver Island, all of the Pacific Coastal States and from 

 Mexico. East of the Rocky Mountains recorded distributions are 

 more complete: S. sexspinosa (Say), the dominant form, is known to 

 range from the North Central States south to the Gulf of Mexico 

 and east to the Atlantic coast, thence north to Massachusetts; rubigi- 

 nosa L. Koch is conmaon in the midcontinent, from Kansas and 

 Missouri east to Ohio, north through Minnesota and Wisconsin, and 

 undoubtedly inhabits adjacent Canada as weU; nigridia McNeill is 

 apparently entirely eastern, its known range extending from and in- 

 cluding Alabama north into Indiana, east of the Appalachians where 

 it is extremely common northward into eastern Pennsylvania. 



Kethops: Recorded from Utah, New Mexico, Arizona, and adjacent 

 Mexico. The geography of the genus is known almost entirely from 

 the type localities of its four species. 



Thalkethops, new genus: Known only from Carlsbad Caverns in 

 southeastern New Mexico. 



Anethops: Only the rare Calif ornian occidentalis Chamberlin has 

 been described. 



Cryptops: A number of foreign species have been detected within 

 North America; one of them, the European hortensis Leach, is defi- 

 nitely known to be established in the Northeast and in Utah. It is 

 undoubtedly more widespread than we now know. Of our half dozen 

 or so species, hyalinu Say occurs widely, at least east of the Plains 

 States. It appears to be common throughout the Midwestern, 

 Southeastern Atlantic, and Northeastern Atlantic United States, its 

 known range stopping just short of New England (in whose temperate 

 coastal areas it and hortensis undoubtedly occur). There is some 

 evidence that hyalina may be either polytypic or reducible to several 

 species. In general one may postulate Cryptops to occur throughout 

 all but the extreme northern United States. 



