1890.] LIZARD COLLECTION IN THE BRITISH MUSEUM. 83 



centre of a single nasal. Eyelids developed, lower scaly. Ear ex- 

 posed. Lintibs well developed, pentadactyle. Upper parts granular 

 with enlarged tubercles, the largest of which are spines ; ventral 

 plates large, squarish, obtusely keeled, forming regiilar longitudinal 

 and transverse series; no collar-fold; throat with large, trihedral, 

 spine-hke tubercles. No femoral or praeanal pores. Tail cyclo- 

 tetragonal, slightly compressed, with rings of enlarged tubcrcle-t. 



The nearest ally of this very striking new genus is Neusticurus, 

 D. & B. Apart from the presence of eyelids it is not without 

 resemblance, in its external appearance, to Lepidophyma^ . 



ECHINOSAURA HORRIDA. (Plate X. fig. 1.) 



Head verv distinct from neck, with pointed snout ; rugose sym- 

 metrical shields on the snout and the anterior half of the vertex, and 

 on the supraocular region ; the rest of the head with unequal-sized 

 granules ; ear-opening smaller tliau the eye-opening ; five or six 

 upper and as many lower labials. Vertebral line with two series of 

 enlarged keeled scales, on each side of which are several oblique 

 convergent series of similar scales ; large erect spines on the nape 

 and flanks, smaller ones on the limbs. Ventral sliields in 8 longitu- 

 dinal and 20 transverse series. A transverse series of seven small 

 shields borders the anal cleft. The hind limb reaches the shoulder, 

 the fore limb nearly the nostril. Tail a little longer than head and 

 body, the keeled scales forming rings largest and subspinose on the 

 upper surface. Brown, with more or less distinct large yellowish 



spots. 



millim. millim. 



Totallength 150 From end of snout to 



Head 17 vent 65 



Width of head 10 Fore limb 23 



From end of snout to Hind limb 34 



fore limb 26 Tail 85 



Two specimens, female and young, from Ecuador. 



Ptychoglossus, g. n. (Teiidarum). 



Tongue moderately elongate, arrow-headed, with oblique plicae 

 converging towards the median line. Lateral teeth compressed, bi- 

 or tricuspid. Head with large regular shields ; frontonasal separating 

 the nasals; prfefrontals and frontoparietals present; nasal pierced 

 in the suture between two nasals. Eyelids developed, lower scaly. 

 Ear exposed. Limbs well developed, pentadactyle. Dorsal and lateral 

 scales subequal, narrow, with parallel sides, ending in an obtuse point, 

 imbricate and keeled; ventral plates large, square, subimbricate, 

 smooth, forming regular longitudinal and transverse series. A strong 

 collar-fold. Tail subcylindrical. Male with femoral pores. 



Distinguished fi om Jlopor/hssus, Blgr., in the scaling of the body 

 and the strong collar-fold. 



1 I seize this opportunity to change the name of the allied genus Cricosaura, 

 Gundl. and Peters, 1863, which is preoccupied by a fossil Crocodilian (Wagner, 

 1860), to Cricohpis. 



