302 HELODERMATID.. 
Total length ..... 597 Fore limb ........ 103 
Head cai cawecen 57 Hind limb........ 114 
Width of head .... 46 Tail: snacsuiiowet ace 270 
Body ise onoends 270 
Western Mexico. 
a. Adult. Presidio. Herr A. Forrer ist 
6. Ad., stuffed. Presidio. Herr A. Forrer [C.]. 
e. Ye. Tapana, Tehuantepec. FF. Sumichrast, Esq. (C.]. 
d. Ad, Mexico. J. Marshall, Esq. [ P. ]. 
e, Ad., stuffed. Mexico, Sir J. Richardson |P.]. 
Jig. Ad., stuffed. Mexico. 
2. Heloderma suspectum. 
Heloderma horridum (non Wiegm.), Baird, U.S. Mex. Bound. Surv. 
ii. Rept. pl. xxvi.; Cope, Proc. Ac. Philad. 1866, p. 303. 
suspectum, Cope, Proc. Ac. Philad. 1869, p. 5. 
Closely allied to the preceding. The digits and the tail are 
shorter, and the tubercles on the back are separated by wider gra- 
nular interspaces. Yellowish or orange, with blackish network on 
the back and cross bands on the tail. 
millim millim 
Total length ...... 488 Fore limb ........ 95 
Headiin ts pt ae sa-ws 58 Hind limb........ 97 
Width of head .... 50 Pat op ecieeaieas 148 
Body sox eee new 282 
Arizona and New Mexico. 
a. Ad. Arizona. Smithsonian Institution [P.]. 
Whether the following genus is to be placed here, or constitutes a 
distinct allied family (Lanthanotide, Steindachner), must remain 
doubtful until its anatomical characters are known. Its dentition 
was originally stated to be the same as in Heloderma, but this has 
been subsequently corrected by Steindachner. 
LANTHANOTUS. 
Lanthanotus, Steindachner, Denkschr. Ak. Wien, xxxviii. 1878, 
p. 95, and Sttzb. Ak. Wren, lxxviii. i. 1879, p. 399. 
Ear concealed. No gular fold. Digits granular inferiorly. 
Upper surface of body and tail tubercular, with rows of large wart- 
like tubercles, each of which bears a horny keeled scale ; abdominal 
scales flat, feebly imbricate. No labial shields. 
Borneo. 
1. Lanthanotus borneensis. 
Lanthanotus borneensis, Stend. 1. c. pl. ii. 
Head depressed, oval, with broad round snout; eyes very small ; 
