70 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



TABLE OF SPECIES. 



KEMALKS. 



Wingless 3 



VVinjjod. 



.Stijjma and panistigma both pn^ent 2 



PiirastifjMia entirely wantinjf. 



Black ; trochanters, tibial, and tarsi pale brown . . . i'. ohkgonknsis, sp. nov. 



2. Coxa' black. 



Middle and posterior loj^s fuscous, the tarsi yellow; anterior coxic alone 



black P. FORMicoiDEs, Prov. 



All eoxa^ and femora black, tibiic and tarsi honey-yellow; mandibles palo 



P. FLOKiDANrs, Ashni. 



Legs l)rown ; anterior tibiae and tarsi honey -yellow ; mandibles black 



P. MINIMUS, sp. uov. 

 Coxa" yellow. 



LejXs entirely reddish or honey-yellow P. MELI.IPKS, Ashni. 



3. Trochanters, tibia", and tarsi lioney-yellow; rest of the legs black 



P. rROLONOATlS, Prov. 



Perisemus oregonensis, sp. nov. 



9 . Length, 5"'"'. Black, shining; the liead and thorax closely, 

 microscopically jmnctate, the former with some larger scattered thim- 

 ble-like pnnctures; metathorax subopaque, without carina^, finely punc- 

 tate; legs black; all trochanters, tibiie, and tarsi pale brown, the 

 middle tibiaj with only one spur. Head large, almost twice as wide as 

 the thorax across the eyes, and a long, prominent, frontal carina. An- 

 teume 12-jointed, one-fourth h>nger than the head, honey yellow, taper- 

 ing towards tips; the first fiagellar joint is about as long as tlie pedi 

 eel, which is a little more than twice as long as thick; remaining joints 

 to the last gradually subequal, the last longer than the penultimate. 

 Wings hyaline, with a slight fuscous tinge at the middle, the veins 

 brown; stigma small, quadrate, black; parastigma wanting; the sub- 

 median cell is one third shorter than tlie median ; the basal vein broken 

 by a stump of a vein beyond the middle; stigmal vein very long, ab- 

 ruptly curved upwards at tip and almost forming a complete marginal 

 cell. Abdomen ovate, not quite as long as tlie head an«l thorax to- 

 gether, bhw'k and shining, the second, third, fourth, and fifth segments 

 emarginate at the middle. 



Habitat.— Portland, Oregon. 



Described from a single specimen obtained from H. F. Wickham. 



This is the only .species known to m«; in this genus without a para- 

 stigma, and this character, in connection with the single tibial spur on 

 the middle legs, may be sufficient to found a new genus. 



Perisemus formicoides Prov. 



liethylus f<rrmicoi(lei> Prov., Add. et Corr., p. 179; Cress. Syn. Hym., p. 247. 

 9. Length, 2.0 to 3""". Black, polished; h'gs and antennae honey- 

 yellow, the latter brownish toward tips; the anterior and posterior 



