20. PLESTIODON 21. EUCHIROTES 597 



showing longitudinal stripes which do not appear in P. 

 guttulatus. Larger specimens of the two species seem indis- 

 tinguishable and it is probable that some of the Arizona 

 records of P. guttulatus may be based upon individuals of 

 P. obsoletus with evident white spots on the head. 



Family 10. BIPEDID^ 



This family includes three genera of curiously grotesque, 

 burrowing, worm-like creatures, which are distinguished 

 from the closely related Amphisbasnida; by the possession of 

 a pair of well-developed anterior limbs. There are no distinct 

 scales, the skin being divided into worm-like annular seg- 

 ments, each of which is subdivided into little squarish scale- 

 like areas. The eyes are rudimentary. The genera all are 

 Mexican, Euchirotes being confined to Lower California. 



Genus 2\. Euchirotes 



Euchirotes Cope, Amer. Naturalist, 1894, p. 436 (type, iiforui). 



The head is provided with a few large plates above and 

 below. The body is elongate, nearly circular in transverse 

 section, and of about the diameter of the head. The tall is 

 moderately short and very blunt. The limbs are short, 

 strikingly like the anterior limbs of a mole, with five digits. 

 All of the digits bear claws. The dorsal and abdominal 

 "scales" are separated by a lateral groove. Only one species 

 is known. 



134. Euchirotes biporus Cope 

 Belding's Mole Lizard 



Chirotes canaliculatus Streets, Bull. U. S. Nat. Mus., No. 7, 1877, 

 p. 37; Yarrow, Bull. U. S. Nat. Mus., No. 24, 1883, p. 38; Cope, 

 Bull. U. S. Nat. Mus., No. 32, 1887, p. 47; Belding, West Am. 

 Scientist, III, 24, 1887, p. 97. 



Chirotes sp.? Lockington, Amer. Nat., 1880, p. 295. 



