1890.] HELODERMA SUSPECTUM. 235 



very close affinity with them. Giuither has said ' that " Central 

 America possesses, besides, five other families, small in species and 

 restricted in ran^^e (some belonging to the fauna of great elf vations), 

 but highly interesting types. These arc the Eublepharidee, Xeno- 

 sauridee, AnieUidce, Heloderinatidce, and Lepidophymatldce. Their 

 localization and differentiation can be accounted for on the hypothesis 

 that they are the remains of the fauna of the various islands into 

 which Central America was broken up at a former period." This is 

 likewise quite in the line of my thinking. 



XVI. Bibliography. 



The following works are the principal ones that refer to tiie 

 llELODEllMATlDiE, and the most important of them have been 

 consulted by the writer in connection with the present monograph. 



(1) 1051. Hernandez (Franciscus). — ' Historise animalium et 



mineralium Novae Ilispaniie Uber vnicus ' ; Cap. p. 315. — 

 (This is the first authority tliat alludes to H. horridum, and 

 in the volume quoted we find a very fair description of the 

 Keptile, the author stating that it was known to the Mexicans 

 as the Acastelepon, but to the Spanish Creoles as the " Es- 

 corpion.") 



(2) 1829. WiEGMANN (Arend Eridericus Augustus). — Isis, 



pp. G27-629. — (Under the name of Traclujderma horridum, 

 V\ iegmann, in this place, presents us with rather a super- 

 ficial description of a Mexican specimen of the reptile ; see 

 also the same work, p. 624, li. horridum.') 



(3) 1830. Wagler (Joannes). — Natiirliches System der Am- 



phibien. P. \^A. — (This naturalist places /?e/orfer?Ha among 

 tiie Thecoglossce lileurodontes.) 



(4) 1833. Idem. — Descriptiones et Icones Amphibiorum. Ease. 



2. — (An unpaged description, in Latin, illustrated by an in- 

 differently executed figure of Heloderma horridum, from an 

 alcoholic specimen vviiich had been brought to Berlin.) 



(5) 1833. ScHiNZ (Ueinrich Rudolph).^ — Naturgeschichte uud 



Abbildungen der Reptilien. Text and Atlas, 4to. Leipzig. 

 P. 1)5; tab. .33. — (Wagler's drawing accompanied by a no 

 better description in German.) 

 (0) 1834. Wiegmann (Arend F. A.). — Herpetologia Mexicana 

 seu Uescriptio Amphibiorum Novae Hispaniae. Berolini. 

 Pp. 6, 7, and tab. i. — (Here this author's well-known 

 suborder of the Squamata is divided into three series, — the 

 Leptoglossi, the lihyptoylossi, and the Pachyglossi. Of these 

 the Leptoylossi is again subdivided into the Brevilingues 

 and the Fissilinyues, and in the last-mentioned group the 

 Heloderma has been placed, in a family created tor it, the 

 Trachydermi. His coloured figure of Heloderma horridum 

 is too brown in its colouring, and in form only presents us 



' Eucyclopacdia Britaiiuica, 9th ed. vol. xx. p. 470 (1886). 



