506 ADDENDA AND CORRIGENDA. 
Add:— Page 368. Var. tessellatus. 
e-d, Her. & yg. Arizona or New Mexico. Dr. W. G. Wright [P.]. 
Add: . Page 373. Cnemidophorus ocellifer. 
uo. Paraguay. 
Add :— Page 380. Teius teyou. 
r-8. Eggs. Rio Grande do Sul. Dr. v. Ihering [C.]. 
wale ss Page 389. Arthrosaura reticulata. 
Leposoma picticeps, Cope, Proc. Am. Phil. Soc. xxiii. 1885 (86), p. 99. 
Judging from the description, I must regard Cope’s species as 
based on an adult male of A. reticulata. 
Page 390. Add a genus:— 
16a. MIONYX. 
Mionyx, Cope, Proc. Am. Phil. Soc, xxiii. 1885 (86), p. 96. 
“ First toe of both anterior and posterior extremities with rudi- 
mental straight claw; claws of other digits small, straight, and 
conic. Prefrontal and frontoparietal plates present and distinct 
from each other. TEar-drum exposed. No distinct collar. Femoral 
pores present. Pholidosis squamous, nearly homogeneous.” 
1. Mionyx parietalis. 
Mionyx parietalis, Cope, 1. ¢. 
Scales imbricate and keeled, with acute posterior borders above 
and below ; when the epidermis is lost, the inferior scales are nearly 
truncate. Dorsal and ventral scales subequal, forming 21 trans- 
verse series between the anterior and posterior limbs, across the 
back; behind the auricular meatus, and in the axilla, they are 
coarsely granular. Limbs with large keeled scales. A transparent 
disk on the lower eyelid, which is covered by two scales. Head- 
shields smooth ; a loreal plate, higher than long, projects at an angle 
between two preoculars, the upper of which is large and extends 
partly over the eye, leaving only three narrow supraciliaries; four 
supraoculars; frontonasal large, about as wide as long; prefrontals 
forming a median suture; frontal and frontoparietals considerably 
longer than wide; interparietal large, as wide as long; parietals 
much smaller, longer than wide; no occipitals; temporals small, 
squamous. Seven upper labials, separated from the orbit by a row 
of narrow suborbital scales; five lower labials; an undivided post- 
symphysial and four pairs of chin-shields ; no distinct pectoral scales, 
Limbs slender; the hind limb reaches a little beyond the elbow. 
Digits weak and slender, first rudimental. Femoral pores 10 on 
