XANTUSIIDAs. 325 
with round dark brown spots; a dark brown temporal streak; tail 
with four longitudinal dark brown streaks; lower surfaces pale 
yellow, the throat dotted with brown. 
millim. millim 
Total length ...... 198 Fore limb ........ 25 
Head. . oases pavenes 18 Hindlimb .... . 33 
A re 17 Pea] sei iets “ees .. 107 
Body ie evans 56 , 
N.W. Australia. 
a. Yg. Champion Bay. Mr, Duboulay [C.]. 
Fam. 18. XANTUSIID. 
Xantusiidee, Baird, Proc. Ac. Philad. 1858, p. 254. 
Lacertide, part., Cope, Proc. Ac. Philad. 1864, 
Trachydermi aglyphodonta, part., Bocourt, Miss. Sc. Mex., Rept. 
1878. 
Lepidophymiens, Sumichrast, Bull. Soc. Zool. France, 1880, p. 178. 
Xantustide, Cope, Proc. Ac. Philad. 1883, p. 30. 
Xantusiide, Boulenger, Ann. §& Mag. N. OL. (5) xiv. 1884. 
Lepidophymide, Giinther, Biol. C-Am., Rept. 1885. 
Tongue short, scarcely extensible, indistinctly nicked anteriorly, 
with oblique overlapping plicee converging towards the median line, 
and scale-like imbricate papille on the distal extremity. Dentition 
strictly pleurodont ; teeth numerous, the laterals with obtuscly tri- 
cuspid crowns. Palate toothless, with a large dermal flap overlap- 
ping its fellow on the other side. Postorbital and frontosquamosal 
arches bony, strong, the supratemporal fossa roofed over by the 
cranial bones; premaxillary single; nasals, frontals, and parietals 
two; palatines in contact with each other anteriorly, and with the 
maxillary and os transversum, there being no infraorbital fossa. 
Limbs well developed. Clavicle dilated, loop-shaped proximally ; 
interclavicle T-shaped ; sternum without fontanelle. No abdominal 
ribs. Head covered with symmetrical shields, without dermal ossi- 
fications. Body granular or tubercular above, plated inferiorly. No 
moveable eyelids; pupil vertically elongate. Ear exposed. Femoral 
pores. 
Synopsis of the Genera. 
Dorsal lepidosis heterogeneous; no supraoculars ; two frontals, form- 
ing a longitudinal suture between the prefrontal and the inter- 
parietal. aca aisaeastiort tenes 1. Lepidophyma, p. 326. 
