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 Ameiva a. ameiva in scutation 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. 
Variation:— 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 
