444 bulletin: museum of comparative zoology. 



ill-defined central group of scarcely larger ones; on the area between 

 the two throat folds several rows of large hexagonal scales; under side 

 of body with twelve longitudinal and thirty-six transverse rows of 

 plates; preanal plates irregular and of varying size, the two median 

 ones in a line with the axis of the body, and the two adjacent ones 

 largest; on the lower arm one row of very wide, and two of very 

 narrow antebrachials breaking up into small scales proximately; 

 on the upper arm two or three rows of brachials, very slightly larger 

 and grading into the granules of the arm; on the posterior side near 

 the elbow a small group of slightly enlarged postbrachials; under 

 side of the thighs covered distally with four rows of plates, outer row 

 much the largest, breaking up proximally into ten or twelve smaller 

 rows; thirty-four and thirty -six femoral pores; on the under side of 

 the tibia four rows of plates those of the outer being about double the 

 others; upper side of the wrist covered with granules; outer toe 

 extending a little further than the inner; tail covered with straight, 

 keeled scales; about thirty-three scales in the fifteenth ring from the 

 base. 



Coloration: — Upper and lateral surfaces dark brown tinged with olive 

 or with blue, no pattern but nearly uniform dirt-color; head and tail 

 more olive; ventral surface dark green, tinged with olive or with blue. 



Variation : — There is apparently no variation in the female. We 

 have been able to examine no young individuals, but it is probable 

 that they also do not vary. 



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

 ured one hundred and eleven millimeters from snout to vent. 



There is every reason to suppose that this specimen was one of the 

 types. Cope when he described Ameiva corvina in 1861 stated that 

 the types were in the Academy of natural sciences of Philadelphia 

 (collected by Mr. Hanson) and in the Smithsonian institution (col- 

 lected by Mr. Riise). Dr. Stejneger writes me that there are no speci- 

 mens of this species in the U. S. N. M. and that there is no evidence 

 that there ever were any. The types in the Philadelphia Academy 

 collection are nos. 9115 to 9121. The additional specimens which 

 Cope examined and which he credited to the Smithsonian collection 

 are beyond doubt now in this Museum. One, M. C. Z. 5532, was 

 received when the research collection of reptiles was sent to this 

 Museum by the Peabody academy of science of Salem. It is marked 

 as "a type of A. corvina Cope from Sombrero Island." It may have 

 been given to the Museum in Salem by Cope, or received in exchange 

 for the courtesy of permission to study and describe species in the 

 Salem collection. The types of Chamadeo hasiJiscus Cope and Sepsina 

 grammica Cope were among those which Cope described from the 



