148 bulletin: museum of comparative zoology. 



2. Cinosternon leucostomum A. Dumeril. 



One adult, dried, collected by Dr. G. F. Gaumer. Two young, in alcohol, 

 from Chichen-Itza, taken by Mr. E. H. Thompson. Turtles, probably of this 

 species, were reported several times as having been seen in the Sacred Cenote. 



The specimens agree with the descriptions except that the first vertebral 

 plate has convex sides instead of concave. The axillary and inguinal plates 

 are in contact. 



3. Thallasochelys cephalo (Schneider). 



Skull found on the beach at Progreso. From the number of shells seen 

 this species must be very common. 



LACERTILIA. 

 4. Hemidactylus exsul, sp. nov. 



Type. — No. 7039, Mus. Comp. Zool. Progreso, Yucatan, April 13, 1904. 

 Leon J. Cole. 



Snout about equal to distance between eye and ear openings : forehead 

 concave : ear opening medium, ovoid, oblique. Body and limbs moderate. 

 Digits rather dilated : two divided lamellae under the inner fingers ; five 

 under the second ; six under the others. Three divided lamellae under the 

 inner toes ; six or seven under the others. Below these there are from one to 

 three undivided lamellae beneath both fingers and toes. Granules on snout 

 larger than those elsewhere. Among the granules of the back are fifteen 

 rather irregular series of subtrihedral granules. These are about the same 

 size as the ear opening, sometimes rather smaller. Rostral four-sided with a 

 median cleft above, a little broader than high. Nostril between rostral, first 

 labial, and three nasals. Mental large and subpentagonal : first pair of chin 

 shields almost in contact behind the mental. Ventral scales small, sub- 

 cycloid, slightly imbricate. Male with eight preanal pores in a curved series. 

 Tail rather depressed, bearing tubercles on its base and rather large transverse 

 plates below. 



Color in alcohol : Grayish brown above, somewhat marbled with cinnamon, 

 the darker spots occurring in three irregular series along the dorsal region 

 and very irregularly on the head. 



5. Thecadactylus rapicauda (Houttcyn). 

 One example from Chichen-Itza, Yucatan. Collected by Mr. E. H. Thompson. 



6. Anolis aureolus Cope. 



Six examples from Chichen-Itza. Identified by Dr. Stejneger. 



7- Anolis ustus Cope. 



Five examples from Chichen-Itza. Inclined to brownish below; one 

 example shows a light vertebral stripe. 



