234 



U. S. NATIONAL MUSEUM BULLETIN 216 



mesoscutum with sparse hairs along sides, front, and hind end of its 

 median lobe, elsewhere almost or quite bare; hind femur of male about 

 4.6 as long as deep, of female about 5.8 as long as deep; third segment 

 of hind tarsus about 3.0 as long as deep in male, about 3.7 as long as 

 deep in female; discoidella present or absent, absent in about half of 

 the specimens, usually absent in smaller specimens; second and third 

 tergites polished; hairs on fourth tergite moderately sparse to very 

 sparse, evenly distributed, or absent from more or less of the medio- 

 basal part of the tergite. 



Figure 98. — Localities for 

 Acrodactyla degener. 



Black. Clypeus often dark brown; scape and pedicel stramineous 

 in front; mandible stramineous or brown; palpi, tegula, and hind 

 corner of pronotum white ; front and middle coxae and all trochanters 

 ivory; front leg beyond trochanters stramineous with a tinge of ful- 

 vous, its tarsus brownish at apex and sometimes a faint, narrow, 

 brownish, subbasal ring on its tibia; middle leg beyond trochanters 

 stramineous fulvous, its tarsus brownish and its tibia with a faint, 

 narrow, subbasal brownish ring; hind coxa pale fulvous to dark 

 brown, its apex ivory; hind femur light fulvous to brown, its apex 

 and a dorsal stripe paler (often ivory) ; hind tibia stramineous, a 

 little darker below, with a narrow subbasal band and its apical 0.3 

 brown; hind tarsus brown. 



Mr. J. F. Perkins of the British Museum (Natural History) has sent 

 us a female from Sweden, which seems not to differ from North 

 American specimens. We have compared the types of hadrodactylus 

 in Munich with this specimen from Sweden and found them to rep- 

 resent the same species. It seems likely that Symphylus politus 

 Foerster 1868 is also the same species. We have seen the types of 

 politus in Munich, but did not study them carefully. 



Specimens (86 cf, 259): From Alaska (Cold Bay, King Salmon on 

 the Naknek River, and Mount McKinley at 1,600 ft.); Alberta 



