Vol. I] VAN DEN BURGH— SNAKES OF THE GALAPAGOS ISLANDS 351 



General remarks. — I take pleasure in naming this snake after 

 Mr. Edmund Heller who collected the Albemarle specimen 

 while a member of the Hopkins-Stanford Galapagos Expedi- 

 tion in 1898-99. 



Dr. Boulenger writes me that the British Museum has a 

 young spotted snake said to have been collected at Tagus Cove, 

 Albemarle. It has one hundred and twelve urosteges, but only 

 two hundred and twenty-two gastrosteges. This small number 

 of gastrosteges makes me think that an error may have been 

 made in the locality label. The specimen has scales with two 

 pits, and one would incline to the opinion that it has originated 

 on Barrington or Indefatigable. If, however, there has been 

 no mistake in the label, the Tagus Cove snakes must represent 

 a species distinct from that found at Banks Bay; and it may 

 be that larger collections will show that each of the five large 

 mountains of Albemarle has its own peculiar race of serpent. 



Dromicus slevini, new species. Slevin's Snake 



1903, Dromicus hiserialis biserialis, Heller, Proc. Washington Acad. 

 Sci., V, 1903, p. 93 (part). 



Diagnosis. — No scale-pits; scales in 19 rows; gastrosteges 

 170 to 183; urosteges 82 to 104; no longitudinal light stripes. 



Type. — Male. California Academy of Sciences No. 12,216. 

 Duncan Island, Galapagos Archipelago. August 14, 1906. 



Distribution. — Duncan, Narborough, and Cowley Moun- 

 tain, Albemarle. 



Material. — Three specimens are known. Two are in the 

 Academy collection, while the one from Narborough belongs 

 to Stanford University. 



Description of the type. — Head rather broad, with flattened top and 

 rounded snout. Rostral plate large, broader than high, hollowed below, 

 and bounded behind by internasal, anterior nasal, and first labial plates. 

 Pktes on top of head are : a pair of internasals, a pair of prefrontals, 

 supraocular and part of preocular of each side, a frontal, and a pair of 

 large parietals. Internasals much smaller than prefrontals. Frontal 

 slightly shorter than parietal suture. Anterior and posterior nasals distinct. 

 Loreal well developed, longer than high. One preocular. Two post- 

 oculars. Temporals two followed by two, or one followed by one. Eight 

 superior and ten inferior labials, sixth upper and sixth lower largest, 

 fourth and fifth upper reaching eye, first pair of lower meeting on median 

 line. Genials in two pairs, posterior a little longer, anterior touching five 

 labials. Scales on body smooth, without pits, in nineteen rows. Anal plate 



