XII LACERTAE 5 I 3 



these otherwise typical Geckos are tlie fusion of the nasal hones 

 into one, the small size of the iuterclavicle, and the non-dilated 

 shape of the clavicles. 



Neither the Eublepharinae nor the Uroplatinae are more nearly 

 related to other Autosauri than are the other Geckos. They are 

 mixlifications within the sulj-order of the Geckones. 



Sub-Order 2. Lacertae. — Autosauri with 2^'>'ococluas, solid 

 vertebrae, and with the ventral portions of the clavicles not dilated. 



Cope/ discarding outer appearances as deceptive in the classi- 

 fication of tlie Lacertae, laid stress upon internal characters, 

 notably the presence or absence of osteoderms, the formation of 

 the skull, and the structure of the tongue. Boulenger ' has 

 followed and improved upon Cope's arrangement, and has 

 elaborated the classification, wliich, being used by himself in the 

 three volumes of the Catalogue of Lizards in the British Museum, 

 has also been followed in the present work, with sliglit alterations 

 in the order of treatment of the families. For our present })urpose 

 we diagnose the families as follows, giving preference to such 

 characters as are most easily ascertained : — ■ 



Synopsis of the Families of Lacertae. 



Fam. 1. Agamidae. Acrodont. Toiitnie broad and thick. No osteo- 



denns. Old AVorkl, p. 51"). 



Fam. 2. Iguanidae. Pleurodout. Tongue short and thick. No 



osteoderms. America, Madagascar, Fiji Islands, 

 p. 528. 



Fam. 3. Xenosauridae. Pleurodont, solid teeth. Anterior part of tongue 



retractile. Osteoderms on tlic Ijody. ^Mexico, 

 p. 536. 



Fam. 4. Zonuridae. Pleurodont. Tongue short, not retractile. With 



osteoderms at least upon the skull, where they 

 roof in the sujiratemporal fossae. African 

 sub-region, p. 536". 



Fam. 5. Anguidae. Pleurodont, solid teeth. Anterior part of tongue 



emarginate, retractile into tlie jjoslerior por- 

 tion. Osteoderms on body and head, roofing 

 over the supratemporal fossae. Limlis mostly 

 reduced. America, Euro2)e, India, p. 537. 



Fam. 6. Helodermatidae. Pleurodont, lower teeth grooved, with poison- 



gland.s. Tongue bifid. O.steoderms tiny. 

 Postfronto-squamosal arch absent, p. 540. 



1 P. Ac. Fhilud. 1864, p. 221, and P. Amer. Ass. xi.\. 1871, p. 236. 



'^ Ann. Nat. Hist. {:>) xiv. 1884, p. 117. 

 VOL. vin 2 L 



