27S BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Abdoiueu iu the 9 greatly lengthened, usually twice or more tliaii 

 twice the length of the head and tliorax together, sinuated or slightly 

 contracted beyond the middle, the apical portion being narrowed and 

 l)ointed; the second segment, as nsnal, is the longest, 1)ut the follow- 

 ing are also lengthened; in the S oblong-oval as long as the head and 

 thorax together, the second segment very long, the following all short, 

 the terminal segment curving downward and with a distinct margin. 



Legs clavate, the basal joint of hind tarsi not <iuite twice the length 

 of the second. 



The very long, i)oint(Hl abdomen distinguishes the genus, 

 TABLE OF SPECIES. 



FKMALES. 



Head flnoly punctate, the thorax smooth, impuactured 3 



Head and thorax finely niicroscopically punctate or shagreened. 



All coxtc black 2 



Hiud coxai alone black; legs rufous. 



Second funiclar joint as long as the pedicel P. canadensis Ashni. 



Second funiclar joint shorter than the pedicel P. americanis Ashni. 



2. Femora black or brown black, tibiic and tarsi rufous. 



Fifth abdominal segment much longer than the last P. nigrifemcr Ashm. 



Fifth abdominal segment shorter than the last P. vaxcouverbxsis, sp. n. 



Legs i)iceous, anterior tibi;v, base of middle and posterior tibia' and all tarsi honey- 

 yellow; antenna' black. 

 First funiclar joint contracted, not longer than thick, collar not striate at 



sides P. LurixicoLA, sp. nov. 



First funiclar joint longer than thick; collar striate at sides. P. picipes, sp. nov. 

 Legs browuish-yellow; second funiclar joint about half the length of tlie 



pedicel P. pali.ipes Ashm. 



Legs honey-yellow ; scape and the pedicel at tip, yellow. P. melliscapus, sp. nov. 



3. Abdomen 2^ times as long as the head and thorax together; A-ery strongly de- 



pressed, Avlien viewed from the side cultriform. Coxa? piceoiis; legs 



bright yellow P. compressiventris, sp. nov. 



Abdomen 1^ times as long as the head and thorax together, not depressed. 



Cox;e and legs, yellow P. auripes, sp. nov. 



Coxae black; tip of anterior femora and tibia', base of middle and posterior tibi:e 



and all tarsi, honey-yellow P. alnicola, sp. nov. 



Polymecus canadensis Ashm. 

 Ectadius cauadcnsis Ashm., Can. Ent., xx, p. .^)1. 



9 . Length, 3"^'". Polished black ; the head posteriorly very finely 

 shagreened and delicately transversely striated; lateral ocelli about 

 twice their width from the eye; face polished, impunctured. The front 

 ocellus with a transverse furrow at base before ; mandibles black. Anten- 

 na'. 10-jointed, brown-black, the scape tinged with rufous ; pedicel as long 

 as the second funiclar joint but not so thick; first funiclar joint small; 

 club 6-jointed, the iirst two joints a little more slender than the following, 

 the first, a little longer than the second; joints 3, 4, and 5 about equal 

 in length, 1^ times longer than thick, the upper, outer angle of each 



