170 BULLETIN 58, UNITED STATES NATIONAL MUSEUM. 



"Genus PTYCHOZOON" Kuhl. 



1822. Ptychozoon Kuhl, Isis, 1822, p. 475 {nomen nudum). 



1826. Ptychozoon Fitzinger, Neue Classif. Rept., p. 13 (type, P. homaloce phalum) . 



1827. Pteropleura Gray, Philos. Mag. (2), II, p. 56 (type, P. horsfieldii) . 



1893. Ptychozoum Boettger, Kat. Rept. Miis. Senckenberg., I, p. 35 (emenda- 

 tion). 



There are two species of Ptychozoon, namely, P. JtuJili '' and P. hors- 

 fieldii, which differ considerably. The more essential characters 

 consist in the absence of enlarged tubercles among the dorsal gran- 

 ules in P. horsfieldii, the shorter series of preanal pores and the pres- 

 ence of a distinct series of femoral pores in the males of this species. 

 Also in the much feebler segmentation of the tail, as well as the 

 much smaller development of the caudal lobes, which do not join 

 to form a terminal large flap as in P. huhli. 



PTYCHOZOON HORSFIELDII c (Gray). 



1827. Pteropleura horsfieldii Gray, Philos. Mag. (2), II, July, 1827, p. 56 (type- 

 locality, India: Singapore; type in Brit. Mus.; Hardwicke, collector). — 

 Platydactylus horsfieldii Fitzinger, Syst. Rept., 1843, p. 101. — Ptycho- 

 zoon horsfieldii Mueller, Verh. Naturf. Ges. Basel, X, 1892, p. 209, pi. iv 

 ( Penang) . 



1845. Ptychozoon homalocephala Gray, Cat. Liz. Brit. Mus., p. 164 (part: Singa- 

 pore) (not of Creveld). — P. homaloce phalum Boulenger, Cat. Liz. Brit. 

 Mus., I, 1885, p. 190 (part: Singapore); Proc. Zool. Soc. London, 1887, 

 p. 146 (Riu Kiu Islands).— Okada, Cat. Vert. Japan, 1891, p. 71 (Oki- 

 nawa). — Fritze, Zool. Jahrb. Syst., VII, 1894, p. 860; author's separate, 

 p. 11. 



Thanks to the courtesy of the authorities of British Museum, I 

 have been able to compare Fryer's specimen, said to have come from 

 "Loo-Choo," with the type of Gray's P. horsfieldii (which is a female 

 and consequently lacks the pores) from Singapore, and found them 

 to agree completely. A male from Mount Dulit, Borneo; in the same 

 museum, differs only in having three more preanal pores. 



Descrij)tion (figs. 164-166). — Adult male; British Museum, No. 87. 

 1. 31. 5; "Loo-Choo Islands;" presented by Mr. Pryer. Rostral 

 almost quadrangular, large, at upper corners entering nostrils; 

 the latter surrounded by rostral, first labial, one postnasal, and 

 two supranasals; between the anterior supranasals a large nearly 

 quadrangular shield separating them entirely and joining the rostral; 

 twelve supralabials; mental small triangular, followed by a pair of 



a From Ttrv^, a fold; Zooov, an animaL 



& Ptychozoon huhli is Creveld 's Lacerta homalocephala, the name of which is pre- 

 occupied. See Stejneger, Proc. Biol. Soc. Washington, XV, March 5, 1902, p. 37. 



c Named for Dr. Thomas Horsfield. Born May 12, 1773, at Bethlehem, Pennsyl- 

 vania; died in London, July 14, 1859. Lived a long time in Java. Author of Zoolog- 

 ical Researches in Java, etc. (1821-1824), and Plantae Javanicae, 3 vols. (1838-1852). 



