BARBOUR AND NOBLE: LIZARDS OF THE GENUS AMEIVA. 465 



Remarks: — The description was made of an adult male that meas- 

 ured one hundred and six millimeters from snout to vent. 



We have examined five specimens, adults, of both sexes, from the 

 University of Michigan No. 46137, 46140, 46141, 46141, 46142 and 

 46150. These were all taken August, 1904, at Dunoon, Demerara 

 River, by Dr. A. G. Ruthven and his assistant Mr. Frederick Gaige. 

 Thanks to Dr. Ruthven's generosity the Museum of Comparative 

 Zoology has been able to retain one of the paratypes mentioned above. 



Habitat: — Apparently confined to the region between the Demerara 

 and Orinoco Rivers. 



AmEIVA AMEIVA MELANOCEPHALA, Subsp. nov. 



Description: — Adult female; Type M. C. Z. 9993. Cumanacoa, 

 Venezuela; 1896; W. H. Phelps. 



Similar to Amciva a. ameiva in sGutation except for the median gulars 

 which are larger in this race and form a distinct group; unlike any of 

 the other races of Ameiva ameiva, the throat, under side of neck and 

 upper part of chest, of this form, are smoky; dorsal surface dark brown; 

 numerous confluent black spots on the upper surface and extending 

 down over the outer ventrals; an indistinct stripe on each flank mar- 

 gined by two light ones; ventral surface straw-color posteriorly, 

 smoky anteriorly; legs and tail spotted with smoky blue. 



Variatio7i: — Three males from La Guayra, Venezuela, although 

 having the characteristic smoky throat differ in other ways from this 

 female in coloration. For example one specimen, U . S. N. M., 27788, 

 is olive-gray above. There are no dark confluent spots nor any lateral 

 stripes, but on each flank a series of pale blue spots, surrounded by 

 dark circles. These spots are arranged somewhat irregularly in verti- 

 cal rows. On the ventral side the smoky wash of the throat extends 

 down over the abdomen . A young specimen M . C . Z . 9994 (same data 

 as female described) has the broad lateral stripe of dark brown bor- 

 dered with white. There is a faint smoky wash over the throat, and 

 the lateral white spots are very faint. Only a few dark spots appear 

 on the back. 



Remarks: — The description was made of an adult female measur- 

 ing one hundred and thirty-five millimeters from snout to vent. 



We have examined three specimens from Cumanacoa, M. C. Z. 

 9993-5, adults and young. By the kindness of Dr. L. Stejneger we 

 were able to compare with them three adult males, U. S. N. M., 

 22526, 27787 and 27788, from La Guayra, Venezuela, collected by 



