1901.] >'ATUKAL SCIENX'ES OF PHILADELl'IIIA. 13 



that the references given in this paper are such only as aie neces- 

 sary to historical exactness, being in most cases to the original 

 description ; to the works of Cope and 'Boulenger cited ; to Baird 

 and Girard's Catalogue of North American Siud-es (1853); to 

 some late papers by Mr. Stejneger, and to a valuable paper by 

 Mr. Yan Denburg on the reptiles of the Pacific coast. ^ 



GLAUCONIID^. 

 GLAUCONIA, Grey. 



Cat. Lizards, Br. Mus., 139 (1845); Hoia B. and G., Cat. Serp. No. Am., 

 149 (1853); Glauconia and Renn Cope, Proc. U. S. Nat. Mus., 1892, 

 539, 590 ; Glauconia BouL, Cat. Snakes Br. Mus., I, 59. 



No maxillary teeth; rostral large, projecting; one nasal, 

 divided or half-divided and touching the lip; eyes covered with 

 scales; an ocular which reaches the lip; a median row of scales 

 extending to the rostral; body surrounded with cycloid scales; 

 anal entire; body cylindrical; tail short and blunt; head not 

 distinct. 



Hab. — Africa; southwestern Asia; tropical America. 



Two species are known in the United States : 



Supraoculars present, I. G. dulcis. 



Supraoculars absent, 2. G. hmnilis. 



Glauconia dulcis B. and G. 



Rena dulcis B. and G., I. c, 142; Glauconia. dulcis Cope, I. c, 590; 

 Boul., I. c, I, 65 ; Leptotyphlops dulcis Stej., Proc. U. 6. Nat. Mus., 

 1891, 501 ; Glauconia dissecta and G. dulcis Cope, Eep. Nat. Mus., 

 716, 717. 



Size small; two or three pairs of plates in front of frontal; a 

 supraocular plate on each side with a smaller one between them; 

 nasal divided; scales in 14 rows. Length about 200 mm. (tail 

 about one-twentieth). Pale brown above; white on belly. 



G. dissecta Cope, may prove to be distinct, but the inconstancy 

 of the head shields in these low, burrowing forms is a strong j^re- 

 sumption against it. 



Hab. — Texas, New Mexico and Mexico. 



' Occasional Papers of the California Academy of Science, No. 5, 1897. 



