MR. E. G. BOULENGER ON A NEW HORNEB LIZARD. 537 



26. On a new Lizard of the Genus Plirynosoma, recently 

 living in the Society's Gardens. By E. G. Boulenger, 

 F.Z.S., Curator of Reptiles. 



[Received May 12, 1916 : Read May 23, 1916.] 



(Plate I.) 



Among a small collection of reptiles from Texas given to 

 Dr. H, G. F. Spurrell by Prof. J. S. Huxley for presentation to 

 the Society, I found a lizard of the genus P?t,rynosoma, which is 

 evidently new, and for which I propose the name of Plirynosoma 

 hrevicornis. Superficially the lizard resembles F. douglassii, the 

 head-spines being extremely shoft, but it differs in the nostrils 

 being pierced within the canthi i-ostralis and in the pectoral and 

 ventral scales being strongly keeled. From P. ianrus, to which 

 it is in some respects closely related, it differs in the much 

 shorter head-spines, in the gular scales being smooth, and in the 

 longer tail. 



Phrynosoma brevigornis, sp. n. (PI. I.) 



Head broader than long, with the spines very small. Posterior 

 outline of the head foi'ming a slight concave curve. Nostril 

 pierced within the canthus rostralis. Tympanum naked. Head- 

 spines obliquely turned upwards : they number three temporai, 

 two very small occipital, and a minute postorbital. The temporal 

 head-spines largest, slightly larger than the largest spinose scales 

 on the body. Lower labials terminating in a sei'ies of pointed 

 scales. Gular scales equal, smooth. Gular fold strong. A dermal 

 thickening bearing a few erect spines on each side between the 

 gular fold and the tympanum. Back and limbs with scattei'ed, 

 erect, large, keeled, spinose scales. A regular lateral series of 

 spines. Pectoral and ventral scales strongly keeled. Eleven 

 femoral pores on each side, the series not joining medially. Tail 

 about two and a quarter times as long as head. Yellowish brown 

 above, pale yellow on the sides ; lower suifaces yellowish white, 

 uniform. 



Total length 107 mm. 



EXPLANATION OF THE PLATE. 



Fhrynosoma hrevicornis. 



Fig. 1. Front view. 



2. Side view. 



3. Upper view. 



