376 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 92 
Snout to vent 50 mm.; tail 61 mm. (regenerate); foreleg (from 
axilla) 15 mm.; hind leg (from base of tail) 21 mm. 
Color—Dorsal surface light gray, hghter on head; no marks on 
dorsal surface of latter; sides of head dark brown (black), with 
numerous, large, hght areas in labial and lower temporal region; 
centers of supralabials dark; chinshields and mental with large dark 
areas toward border, and a smaller dark area medialiy; throat with a 
few small flecks of black; posterior temporal region and sides of body 
with small, scattered, round, light spots bordered by black; these spots 
form a more or less definite paravertebral and dorsolateral row on each 
side, and in these rows their dark borders expand anteriorly and 
posteriorly and become continuous; middorsal area unmarked; tail 
with similar, scattered light spots (which occupy more than half the 
total caudal surface), but here they are rectangular; large, light, 
dark-bordered ocelli occur on the limbs as well as on the body; ventral 
surface of body light, with some dark suffusion on the anterior edges 
of the beily scales, especially prominent laterally; subcaudal surface 
spotted (except midventrally) as dorsal surface. 
Variation—The paratype (male) is essentially similar to the holo- 
type. The anterior temporal is half the size of the posterior; the 
median prefrontal is in contact with the frontonasal. There are 10-10 
femoral pores. 
Remarks.—The specimens are named for their coliector, Thomas 
MacDougall, in whose company we spent several very pleasant weeks 
on the Isthmus of Tehuantepec. They were found under fallen logs 
in a pine forest. 
AIGEIA RADULA, new species 
Holotype —U.S.N.M. No. 111472, an adult female from San José 
Manteca, 5 kilometers from San Carlos Yautepec, Oaxaca. 
Diagnosis.—Dorsal whorls three to a caudal segment, ventral whorls 
two; scales on body irregular in size, with many, closely placed, en- 
larged, keeled scales; thigh with enlarged, keeled scales; two or three 
rows of granules middorsally; three temporals, the anterior a third 
size of posterior; enlarged scales in paravertebral rows separated from 
each other by an average of one scale. 
Description of holotype—Similar to dontomas? in general features 
of cephalic scutellation; frontals rather narrowly in contact; a short, 
vertical series of somewhat enlarged scales preceding ear. 
Dorsal scales mostly keeled and conical; 2 or 3 rows of granules mid- 
dorsally, bordered on either side by a series of enlarged, keeled scales 
generally separated from each other by 1 small scale; scales on sides of 
body irregular; scattered, enlarged, keeled, closely placed tubercles 
present; many of dorsal scales of thigh enlarged, keeled; femoral 
pores 10-10; ventral scales 32, in 10 longitudinal series at middle of 
belly; lamellar formula for toes 14-20-16-10-6. 
