266 CALIFORNIA ACADEMY OF SCIENCES {Proc. 4TH SER. 
others like Scharff, very properly point to the lack of positive 
observations on any such method of transportation. The 
unbiassed worker can only conclude from what has been 
written on the subject, and, notwithstanding the many excel- 
lent monographs that have been produced on various portions 
of the fauna and flora, that we need a still more intensive 
and exhaustive exploration of the islands and above all a 
much better acquaintance with their geology than we now 
possess, before he can definitely accept either of the 
hypotheses. 
Family FORMICID. 
Subfamily PONERIN. 
1.  Cylindromyrmex striatus Mayr. 
Cylindromyrmex striatus Mayr, Verh. zool. bot. Ges. Wien 
ZOMAS7ZOMpG97 VOC) ibid) 37 S87 pa oAO me (HeG mony ec 
oe iimeny. Amn Soc wnt Bele onl SOI pos mGen. 
Insect. Ponerinze, Fasc. 118, 1911, p. 15. 
Holcoponera whymperi Cameron, in Whymper, Travels 
Andes Equator, Suppl. Append. 1891, p. 92, fig. 8. 
Cylindromyrmex whympert Forel, Ann. Soc. Ent. Belg. 
$0, USL. oy (Ayn 
A large ocellate and a small nonocellate worker taken by 
F. X. Williams at Academy Bay, Indefatigable Island, agree 
perfectly with Cameron’s figure of Holcoponera whymperi 
from Guyaquil, Ecuador. His specimen was taken indoors, 
which indicates that the species may occur about houses, 
unlike other Ponerinz, and suggests that it may have been 
recently introduced into the Galapagos by vessels from the 
Ecuadorian or Peruvian Coast. 
2. Odontomachus hzmatoda bauri Emery. 
Odontomachus bauri Emery, Ann. Soc. Ent. France, 60, 
1891, p. 591 8; ibid., 63, 1893, p. 476, fig. 
Odontomachus hematoda bauri Emery, Gen. Insect. Pon- 
enincze Waser level Oilol melas: 
Worker. Length 9—11 mm. 
Differing from the worker of the typical form in having 
the head proportionally narrower behind, slightly narrower 
