NATURAL SCIENCES OF PHILADELPHIA. 319 



Muzzle to ear 12^^; to axilla 20^^-5. Axilla to groin 25" ; tail lost. Fore 

 limb 13"; hind limb 18^^ 



With Diplodactylus m a r m o r a t u s Gray, from Australia. No. 724. Mus. 

 Comparative Zoology, Cambridge, Mass. 



Dedicated to my friend Addison E. Verrill, Professor of Zoology in Yale 

 College, Connecticut. 



[PEROPUS Wiegm. 



Three species of this genus before me differ from those described, and may 

 be compared as follows : 



I. The tail much depressed, and with a series of broad shields below. 

 Margin of tail minutely serrate; two internasal plates; mental plates 



abruptly different from gular scales, in one cross row of six, and smaller 

 ones at the angles in front of a straight cross-line. Pale brown with close 

 reddish speckles P. packardii. 



II. The tail broad, depressed, slender, with small scales below. 



A few internasals, two longitudinal rows, hexoganal mentals ; gray with 

 scattered brown spots P. mutilatus. 



III. Tail thickened, depressed, cylindric, without serration ; scaled below. 

 Four cross rows ovate mental plates, the posterior smaller ; three interna- 

 sals ; pink-grey, with brown later shade, with pairs of black dots on each 

 side the middle line, which form strife on the scapular and crural regions. 

 Tail subcylindric P. roseus. 



Two cross-rows ovate mentals, those behind graduating through several 

 rows to the gulars ; four internasals ; tail swollen ; light gray with a brown 

 band on each side P. pusillus. 



Peropus packakdii Cope. 



This is a stout species. Giinther's description of Peripia p e r o a i i Gray 

 applies well to this, but in our animal the toes are all strongly palmate at the 

 base. 



Upper labials 9 — 7 to under the eye, lower seven ; symphyseal large, trian- 

 gular. Gular scales very minute, ventials larger than laterals, and laterals 

 than dorsals. A thick femoral fold behind. Pores in a long line, from 35 to 40. 



Light reddish brown, with small bay specks all over the upper surface. 

 Several small round bay margined spots on the occipital and temporal 

 region. 



Head and body to vent 42" ; muzzle to ear ll''^-5 ; width at ear 8''-7, of 

 tail 6'^. Length of hind limb 14^^-7. 



Penang, Malacca. No. 476. Mus. Peabody Academy, Cambridge, Mass. 



Peropds roseus Cope. 



This species is remarkable for its nearly cylindric tail. I find no femoral 

 pores in two individuals, but a rather large series of scales abruptly divides 

 the granular from the scaled portion of the femur, in their position. Upper 

 labials eight to below orbit. No posterior femoral fold. Dorsal scales 

 extremely minute. General form more slender than in the last species. 



A black spot on each scapular, and one above each axillary region ; one on 

 the iliac, and a line above each ischiadic region ; a row of black dots on the 

 vertebral line of the tail. A brown band from end of muzzle to ear, then a 

 black line to axilla. 



Total length 77^^ ; to vent 40"; to ear 10"; width at ear 4^^-7. 



No. 735. Mus. Comparative Zoology. 



Peropus pusillus Cope. 



This little reptile differs from the last in the three structural and fourUi 

 coloration characters, beyond which it is difficult to observe further pecu- 

 liarity. There are nine superior labials to below the pupil ; there is no 



1868.] 



