484 KELLOGG AND KUWANA 



chestnut brown occipital margin extending faintly over temporal mar- 

 gin ; round yellowish-brown blotches one on each side of mandibles ; 

 small ocular black fleck continued with chestnut brown distinct ocular 

 blotch. Prothorax hexagonal ; sides with prickle and three long hairs, 

 four long hairs on posterior margin. Metathorax with sides produced, 

 posterior margin nearly straight or slightly convex ; posterior angles 

 with two short prickles ; posterior margin with 5 or 6 long hairs on 

 each side of median line. Legs pale yellowish-bi'own with several 

 scattered hairs. Abdomen elongate, with long hairs in posterior angle 

 of segments, and short spines along lateral margins ; two more or less 

 irregular series of hairs on dorsal svirface of each segment ; broad 

 golden brown transverse blotches and narrow chestnut brown lateral 

 bands ; last abdominal segment parabolic with two hairs and a fringe 

 of short sharp-pointed transparent hairs. 



Male. — Body, length 1.68 mm., width .51 mm.; head .36 mm., 

 width .53 mm. ; golden brown ; thorax and abdomen are darker than 

 in female. 



COLPOCEPHALUM SPINEUM Kellogg. 



Kellogg, New Mallophaga, iii, p. 38, pi. iv, fig. i, 1899. — Kellogg, List 

 of Mallophaga, p. 72, 1899. 



Males and females from two specimens of Anous stolidus from 

 Clipperton Island, and a female from Geospiza fuUginosa from Albe- 

 marle. The type specimens of this species were taken from Fregata 

 aquila from Panama. The Galapagos specimens differ somewhat 

 from the Panama specimens and probably ought to be called a variety. 



COLPOCEPHALUM UNCIFERUM Kellogg. 



Kellogg, New Mallophaga, i, p. 140, pi. xii, figs. 1-3, 1896. — Kellogg, 

 List of Mallophaga, p. 72, 1899. 



One female from Certhidea albemarli from Albemarle. Identical 

 with the type specimens, which were described from Pelecanus ery- 

 throrhynchus from Lawrence, Kansas, and from P. californicus from 

 Monterey Bay, California. At first glance this seems an inexplicable 

 case of distribution, Certhidea being not only a land bird but a genus 

 peculiar to the Galapagos Islands. The explanation lies in the pres- 

 ence of Pelecanus californicus^ abundant on the islands. The pelican 

 is the normal host of the parasite, but the migration to Certhidea has 

 been effected by the crowding together of water and land birds on the 

 rocks. This is a conspicuous example of the ready change to a host 

 of very different character and habits, which is one of the features of 

 the distribution of the Galapagos Mallophaga. 



