216 Proceedings of the Biological Society of Washington. 



Atneiva griswoldi sp. nov. 



Type an adult, M. C. Z. No. 11945, from St. John, Antigua, B. W. I., 

 collected in the summer of 1916 by Dr. Don. W. Griswold, Director of the 

 Rockefeller AVest Indian Hookworm Commission. 



This species belongs among those having the caudal scales of the adult 

 straight dorsally, the nostril anterior to the nasal suture and having ten 

 longitudinal rows of ventrals. This brings it into an assemblage rather 

 remote geographically, viz. dorsalis of Jamaica, thoracica of the Northern 

 Bahamas and auberi of Cuba. In color the new species recalls A . cinera- 

 cea Barbour and Noble from Guadeloupe (Cf. Revision of Ameiva, Bull. 

 M. C. Z., 49, 1915, p. 425). 



Rostral forming approximately a right angle behind; nostril in the 

 posterior part of the anterior nasal ; anterior pair of nasals in contact ; 

 frontonasal almost as wide as long, widely in contact with posterior nasal 

 and just touching the loreal; frontal in contact with the first, second and 

 third supraoculars; a pair of frontoparietals in contact with the third 

 supraocular for a very short distance and then separated by a single or 

 double row of granules (in the other examples they are wholly separated) ; 

 four (three in one other example) occipitals in a transverse row; seven 

 supraciliaries ; three supraoculars, the first separated from the loreal; two 

 posterior supraoculars separated from the superciliaries by a single row 

 of granules; last supraocular separated from the outer occipital by a 

 double row of small scales; five large and one small supralabial to below 

 the center of the eye; four infralabials, the second enormous, the third 

 next largest ; between the infralabials and chin shields a series of granules 

 extends forward and just separates the extreme posterior portions of the 

 third infralabial and the first paired chin shield; the throat granules 

 extend forward and just separate the posterior portions of the first pair 

 of chin shields; chin and throat covered with minute granules, a wide 

 transverse zone of which are considerably enlarged ; a single series of 

 very conspicuously enlarged scales and two rows less enlarged across the 

 throat between the two folds ; under side of body with ten longitudinal 

 and thirty-two complete transverse rows of plates; preanal plates in a 

 roughly rectangular area, two at the vent margin, with a few small en- 

 larged scales at each side, a single larger scale surmounting the two and 

 a few other slightly enlarged scales surrounding the three very large 

 ones; on the lower arm four rows of antebrachials, the two outer rows 

 very small and of the two inner rows one is much larger and more strap- 

 like than the other; on the upper arm a series of brachials which in- 

 creases in size and becomes multiple toward the shoulder; no considerably 

 enlarged postbrachials; under side of thigh with four rows and many 

 scattered enlarged plat«s, the outer row largest, the others successively 

 smaller; 29 femoral pores on each side; on the under side of the tibia 

 about three rows of plates, the outer with the two upper plates enormous; 

 upper side of foot with regular series of transverse enlargeid plates ; tail 

 covered with approximately straight keeled scales ; about 38 scales in the 

 fifteenth ring from the base of tail. 



