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



interspace, by two larger ones. Thus, counting all sockets as 

 well as teeth: — 



No. 11935, Dromicus hoodensis, from Hood Island, has 12 

 and 2. 



No. 11800, Dromicus hoodensis, from Hood Island, has 12 

 and 2. 



No. 11926, Dromicus hoodensis, from Hood Island, has 12 

 and 2, 



No. 11930, Dromicus hoodensis from Hood Island, has 10 

 and 2. 



No. 10782, Dromicus dorsalis, from James Island, has 11 

 and 2, 



No. 10483, Dromicus dorsalis, from South Seymour Island, 

 has 10 and 2. 



No. 1 1488, Dromicus occidentalis, from Narborough Island, 

 has 11 and 2. 



No. 10281, Dromicus occidentalis helleri, from Brattle 

 Island, has 10 and 2, 



No. 10617, Dromicus steindachneri, from Jervis Island, has 

 11 and 2. 



The hemipenes of Dromicus hoodensis (No. 9336) from 

 Hood Island, of Dromicus slevini (No. 12216) from Duncan 

 Island, and of Dromicus dorsalis (No. 10483) from South 

 Seymour Island, all are divided, with furcate sulcus, calyculate, 

 spinous proximally, and with no apical disc. They agree in 

 every respect with the figures given by Cope of these organs 

 taken from "Monohothris" chamissonis, "Alsophis" angulifer 

 and Dromicus parvifrons of Peru, Cuba and Hayti. 



Scale-pits do not occur in all the scales of any specimen 

 from the Galapagos. When they are present, they are most 

 constant in the scales in or near the region of the lateral stripe 

 and on the upper surface of the tail. Most careful examina- 

 tion has failed to disclose any trace of pits in any scale of any 

 of the Galapagos snakes having fewer than one hundred and 

 ninety gastrosteges. The Hood Island. and the Charles Island 

 species also normally have no scale-pits ; but long search on 

 the thirty-six specimens at hand from Hood resulted in the 

 discovery of a single scale with one pit. Excepting the species 

 from these two islands, all of the snakes of the Galapagos with 



