FAUNA OF THE ALEUTIAN ISLANDS AND ALASKA PENINSULA 393 



the whirligig beetle, apparently is present on all of the islands. 



Of the carrion-feeding beetles, Nebria, a small brown form, is 

 fairly common in rotting kelp. Catops is the smallest beetle (about 

 3 millimeters long) observed on the islands. Specimens of a large 

 (25 millimeters) black staphylinid were collected under a decom- 

 posing sea lion at Attu Village. 



Eurystethes, whose habitat is on rocks by the sea, was collected 

 once on Amchitka Island and once on Ogliuga Island, both times in 

 sea-otter droppings. 



Several click beetles, Ludius, and weevils, Lophalophus, were 

 collected. A click beetle, Cryptohypnus littoralis (not reported by 

 Hatch), was found by Cecil Williams in droppings of a blue fox 

 on Attu Island. 



BIRD LICE 



A small series of biting bird lice (Mallophaga) was collected 

 from the slender-billed shearwater, Puffinus tenairostris, at Rat 

 Island and at Unimak Island. The following determinations were 

 made by the Bureau of Entomology and Plant Quarantine, U. S. 

 Department of Agriculture : 



Esthiopterum diversum, Giebelia mirabilis, Ancistrona sp., 

 Menopon sp., and species of Analgesidae. 



DIPTERA 



The following species of true flies were identified in the 1936- 

 38 collections: 



Bibio variabilis, Calliphora vomitoria, Chironomus hyperboreus, 

 Cynomia hirta, Dilophus tibialis, Empis sp., Platychirus sp., Pro- 

 tophormis tcrranovae, Scatophaga sp., Syrphus sp. 



SPIDERS 



Only two kinds were commonly observed, Pardosa and Cybaeus, 

 both of which were medium-sized, dark-bodied spiders collected 

 on mats of damp lichens and low vegetation. A single specimen 

 (female) of a huge, milk-white Aranea sp. was collected near its 

 orb web on a low bush at Unalaska. 



Cybaeus reticulatus was collected on eight islands. Members 

 of this family (Agelenidae) spin sheet-like webs, usually in the 

 form of a funnel with a tubular retreat. 



Four wolf spiders (family Lycosidae) were collected. Members 

 of this group do not spin webs and are commonly found running 

 over damp fields. Lycosa sp. was taken once. Pardosa tarsalis 

 was taken on six islands. Pirata piratica was taken once. The 



