REPTILES 93 



DROMICUS BISERIALIS BISERIALIS (Giinther). 



Herpetodryas biserialis GUNTHER, Proc. Zool. Soc., p. 97, 1860. 



Dromicus chamissonis PETERS, Mon. Berl. Ac., p. 719, 1869. BOUL., Cat., 



n, p. 119, 1894 (part). 

 Dromicus chamissonis var. biserialis GUNTHER, Zool. Rec., p. 115, 1869 



(part). 

 Dromicus chamissonis var. dorsalis STEINDACHNER, Festschr. Zool.-bot. Ges. 



Wien, p. 306, pi. i, fig. i, 1876. 

 Opheomorphus chamissonis COPE, Proc. U. S. Nat. Mus., XII, p. 147, 1889 



(part). 

 Orophis biserialis GARMAN, Bull. Essex Inst., xxiv, p. 85, 1892 (part). 



Range. Galapagos Archipelago ; Charles (Darwin, Hassler) ; 

 Indefatigable (Hassler) ; James (Hassler, Albatross 1888) ; Albe- 

 marle (Hassler, Hopkins Stanford Exped.) ; Narboro (Hopkins Stan- 

 ford Expedition). 



Specific Characters. Close to D. chamissonis, from which it is 

 doubtfully distinct, differing chiefly in the greater number of gastros- 

 teges, 209-252 (175-201 in D. chamissonis} and in the shorter pre- 

 frontals which equal or but slightly exceed the internasals in length. 



The coloration above is dark olive, either uniform or dark-blotched 

 and spotted on nape, or with a pair of light brownish longitudinal 

 dorsal stripes covering the third and fourth scale rows. These begin 

 three or four inches posterior to the head and extend to the tail, 

 the stripes anteriorly represented on the nape by a series of spots of 

 the same color. Head and throat below thickly dark-spotted. 



Oculars 1-2, rarely 1-3 ; temporals usually 123. Two speci- 

 mens have a few of the dorsal scales marked with double scale-pits but 

 none of the others shows this character. 



One specimen, Cat. No. 4977, Stan. Univ. Mus., taken on Albe- 

 marle, near Cape Berkeley, had the following coloration in life : above 

 brown, the scales minutely dark-dotted; two longitudinal series of 

 black spots on sides of body; neck above lighter brownish-yellow 

 with a median black stripe and a single series of large black blotches ; 

 top of head spotted minutely with light yellowish ; tail unspotted, be- 

 coming lighter toward the tip ; sides of head about labials light with 

 darker brownish spots ; belly pink with a steel gray luster, darkly 

 spotted on sides; throat and mandible more grayish, thickly dusky- 

 spotted ; tail light yellowish inferiorly. 



Most of the Narboro specimens have the light dorsal stripes very 

 distinct; one specimen, however, is uniform dark brown above and 

 another resembles the Albemarle specimen in coloration. A young 

 specimen from this island has a color pattern quite different from 

 any of the others. Its general coloration above is dark brown, the 



