338 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



teges, three postoculars, scales in nineteen rows, and the spot- 

 ted style of coloration. 



General Remarks. — Snakes must be very rare on Charles 

 Island, for none were seen there by any member of our expe- 

 dition, although careful search was made for them. It is 

 probable that the ravages of the smaller kinds of mammals 

 that have been introduced there — particularly rats and cats — 

 have pushed them to the verge of extinction, as they have the 

 Tropidurus. It is probable that a longer search would show 

 that snakes are still to be found on Champion and Enderby 

 as well as on Gardner, for Tropiduri still are fairly abundant 

 on all these islets. 



The Charles Island snake is most closely related to the 

 Hood Island species. It differs from that species in having 

 numerous dorsal spots, no dorsolateral bands, and no definite 

 dark spots on the anterior gastrosteges. 



Dromicus hoodensis new species. Hood Island Snake 



1892, Orophis hiserialis Garman, Bull. Essex Inst., XXIV, 1892, p. 85 

 (part) . 



1903, Dromicus hiserialis habeli Heller, Proc. Washington Acad. Sci., 

 V. 1903, p. 93. 



Diagnosis. — No scale-pits ; scales in 17 or 19 rows; gastros- 

 teges 203 to 214; urosteges 91 to 114, usually all paired; post- 

 oculars three; temporals usually 2+2; never spotted; striped, 

 the stripes becoming obsolete posteriorly. 



Type. — Male. California Academy of Sciences No. 11799. 

 Hood Island, Galapagos Archipelago. J. R. Slevin. June 23, 

 1906. 



Distribution. — Hood and Gardner-near-Hood islands, Gala- 

 pagos Archipelago, 



Material. — One specimen collected by Dr. Baur on Hood 

 Island has been recorded by Garman. Two secured on Hood 

 by Heller are Nos. 4970 and 4971 in the collection of Stanford 

 University. The Academy has thirty-four from Hood and 

 one from Gardner-near-Hood. 



