104 IGUANID.E. 



a. 2 • Orizaba. 



b. Hgr. Yucatan. 



c. Hgr. Mexico. Dr. J. E. Gray [P.]. 



d. Hgr. Mexico. M. Salle [C.]. 



8. L-SJMANCTUS. 



Ljemanctus, part., Wiepn. Herp. Mex. pp. 16, 45 ; Dum. ^- Bibr. 



iv. p. 70. 

 Lgemanctus, Fltzing, Syst. Rept. p. 63; Gray, Cat. Liz. p. 185; 



Bocourt, Miss. Sc. Mex., Rept. p. 114; Bouleny. Bull. Soc. Zool. 



France, 1877, p. 460. 



Tympanum distinct. Head plane above, shelving forwards, the 

 occipital region more or less raised and produced beyond the occiput. 

 Eody compressed, covered with imbricate keeled scales ; dorsal crest 

 feebly developed or absent. A strong transverse gular fold ; no 

 gular pouch. Limbs very long; infradigital lamellae with a median 

 tubercle-like keel. No femoral pores. Tail very long, round. 

 Lateral teeth tricuspid ; pterygoid teeth. Clavicle loop-shaped 

 proximally. No sternal fontanelle. No abdominal ribs. 



Central America. 



Synopsis of the Sjjecies. 



I. Scales on upper surface of snout much larger than those on 



occipital region. 



A. A series of projecting triangular scales on the posterior contour 



of the head ; a feeble dorsal crest. 



57 to 61 scales round the middle of the 



body 1. serratus, p. 104. 



45 to 51 scales round the middle of the 



body 2. alticoronatus, -p.105. 



B. No distinct serration on the posterior 



contour of the head ; no dorsal crest. . 3. Jongipes, p. 105. 



II. Scales on upper surface of snout not 



distinctly larger than those on occipital 



region; no dorsal crest 4. dehorrii, p. 106. 



1. Laemanctus serratus. 



Laemanctus longipes, (non Wiegm.) A. Dum. Arch. 3Ins. viii. p. 512, 

 pi. xxi. fig. 4 ; Bocourt, I. c. p. 114, pi. xvii. fig. 4. 



serratus, Cope, Proc, Ac. Philad. 1864, p. 176 ; Bocourt, I. c. 



p. 116 ; Bouleng. I. c. p. 463, pi. vii. fig. 3. 



Upper head-scales rugose, very large on upper surface of snout, 

 where they usually form three regular pairs ; the posterior part of 

 the head more elevated in the males than in the females, bordered 

 by projecting triangular ribbed scales ; labials large ; tympanum 



