46. UMA, — 47. HOLBBOOKTA. 207 



body above equal, much smaller than ventral ones. Interorbital 

 space with two series of plates. Claws very long, slender and 

 straight. Sides with a round black spot. Tail ?" 



According to Cope, " this genus is distinguished from CalUsciurus 

 by the presence of a series of spines, movable on their bases, on 

 the outer margin of the foot." 



Arizona. 



1. Uma notata. 

 Uma notata, Baird, I. c, 



" Head about two fifths the head and body. Above light pea- 

 green, spotted with darker green. ]ieneath white. Head and body 

 about two inches long.'' 



Mohave Desert. 



47. HOLBROOKIA. 



Holbrookia, Girard, Proc. Am. Assoc, Adv. Sc. iv. 1851, p. 201, and 

 in Stanshurys Exped. Gr. Salt Lake, p. 341 ; A. JDutn. Arch. Mus. 

 viii. p. 545 ; Bocuurt, Miss. Sc. Mex., Rcpt. p. IGO. 



Cophosaurus, Troschel, Arch.f, Nat. ItioO*, p. 389. 



Tympanum concealed. Body depressed ; no dorsal crest ; dorsal 

 scales small, uniform. Upper head-scales small, occipital large. 

 Two strong transverse gular folds, the posterior with denticulated 

 edge ; no gular pouch. Digits with sharply keeled lamellae in- 

 feriorly. A long series of femoral pores. Tail rather short, sub- 

 cylindrical. Lateral teeth subcorneal ; no pterygoid teeth. A 

 large sternal foutanelle. Xo abdominal ribs. 



iSouthern jS'orth America. 



Synopsis of the Sjpecies. 



I. The adpressed hind limb reaches the tip of the snout ; foot 



nearly as long as the distance between the axil and the groin. 



Tail much flattened, with black spots in- 



feriorly 1. texana., p. 208. 



Tail roundish, immaculate inferiorly ; tibia 



not longer than the distance between the 



end of the snout and the antepectoral fold ; 



a pair of black spots on each side of the 



belly 2. propinqua, p. 208. 



Tail roundish, immaculate inferiorly ; tibia 



longer than the distance between the end 



of the snout and the antepectoral fold ; no 



spots on the sides of the belly 3. elejans, p. 209. 



II. The adpressed hind limb does not reach the eye ; foot measuring 



one half to two thirds the distance between the axil and the 

 groin. 



* Issued 1852. 



