1104 



REPORT OF NATIONAL MUSEUM, 1898. 



This species presents, iu several of the specimeus examined, the pecul- 

 iarity of having" an even number of rows of scales — twenty. 



Trimorphodon lyrophanes Cope. 



Catalogue 



No. 



4680 



12632 



8760 



19673 



Number 

 of speci- 

 mens. 



Locality. 



Cape St. Liicas, L. Califor- 

 nia. 

 Fort Buchanan, Arizona. 



La Paz, L. California 



Southern Arizona 



Fort Huachuca, Arizona. 



When 

 collected. 



Feb. —,1882 



From whom received. 



John Xantus 



Dr. B. J. D. Irwin, U. 

 S. A. 



L. Belding 



H. W. Heiisliaw 



Dr. T. Wilcox, U.S.N. . 



Nature of 

 specimen. 



Alcoholic, 

 do. 



do. 



do. 

 do. 



TRIMORPHODON LAMBDA Cope. 

 Trimorphodon lambda Cope, Proc. Aiuer. Phil. Soc, 1885, p. 286. 



Muzzle rather elongate, as in the T. bisciitatus. There are three 

 loreals, and the oculars are 3-3; the temporals are 3-4-3-4. The 

 fourth and fifth labials enter the orbit, and the sixth, seventh, and 

 eighth are higher than long. Pregeneials longer than postgeneials. 

 Internasals small, wider than long; parietals rather short. Gastro- 

 steges, 234; anal, 1-1; urosteges, 83. 



Color above light gray, crossed by brown transverse diamond-shaped 

 spots, each with a pale transverse center. Three or four of the most 

 anterior spots are subhexagonal, being truncate at each side. All are 

 surrounded by a pale shade. Each end of every second or third gas- 

 trostege is marked with a small dark- brown spot, which extends 

 upward on the first row of scales, and sometimes is confluent with the 

 lateral apex of the dorsal spot. 



Measurements. — Total length, 304 mm.; length of tail, 54 mm. From 

 Guaymas, Sonora. Presented to the U. S. National Museum by Mr. 

 H. r. Emerich. Cat. No. 13487. 



TRIMORPHODON UPSILON Cope. 



Trimorplwdon npsiloit Coi'E, Proc. Amer. Phil. Soc, XI, 1869, p. 152; XXIII, 1886, 

 p. 286. — GuNTHEU, lUol. Ceiitr. Amer., Kept., 1895, p. 175.— Boulenger, Cat, 

 Snakes British Mus., Ill, 1896, p. 54. 



Dipsas blscittala var. lutifascia Peters, Mon. Bed. Acad., 1869, p. 877. 



Eteirodipsas hiscutata Jan, Icou. Gen. Oi)hi(l., 1872, p. 39, pi. i, fig. 3. 



Trimorplwdon coUaris Cope, Jonrn. Acad. Nat. Sci. Phila. (2), VIII, 1876, p. 131; 

 Proc. Amer. Phil. Soc, XXIII, 1886, p. 286. 



Sihon hiscuiatum Carman, ])art, N. Amer. Eept., 1883, p. 16. 



Sihon upsilon Garman, N. Amer. Rept., 1883, p. 134. 



Eostral broader than deep, the portion visible from above measuring 

 one-fourth to one-third its distance from the frontal; internasals much 

 shorter than the prefrontals, which are nearly as long as broad; frontal 

 once and a half to once and two-thirds as long as broad, as long as or 

 a little longer than its distance from the end of the snout, as long as 

 the parietals; two or three loreals; two preoculars and a subocular; 



