70 BULLETIN 45, IGNITED STATES NATIONAL MUSEUM. 



TABLE OF SPECIES. 



FEMALKS. 



Wingless .3 



Wiiigod. 



Stigma and parastigma Ijotli prcseut 2 



Parastigina entirely wanting. 



lUaek ; trochanters, tibi:e, and tarsi pale; brown. ..P. ohegonkxsis, sp. nov. 



2. CoxiP black. 



Middle and posterior legs fuscous, the tarsi yellow; anterior cos;e alone 



black P. FORMicoiDES, Prov. 



All coxa- and femora black. tibi;i' and tarsi honey-yellow; maudibles pale 



P. FLORIDANl'S, Ashni. 



Legs brown ; anterior tibia> and tarsi honey-yellow; mandibles black 



P. MINIMUS, sp. nov. 

 Coxa' yellow. 



Legs entirelj^ reddish or honey-yellow P. MELLIPES, Aslini. 



3. Trochanters, tibiae, and tarsi honey-yellow ; rest of the legs black 



P. PUOLONGATl'S, PrOV. 



Perisemus oregonensis, sp. nov. 



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

 microscopically punctate, the former with some larger scattered thim- 

 ble-like i^unctures ; metathorax subopaque, without cariuae, finely punc- 

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

 middle tibiu' Avitli only one spur. Head large, almost twice as wide as 

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

 tenna3 12-jointed, one-fourth longer than the head, honey-yellow, taper- 

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

 cel, 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; parastlgaia wanting; the sub- 

 mediau cell is one-third shorter than the 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 the head and thorax to- 

 gether, black 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 me in this genus withont a para- 

 stigma, an«l this character, in connection with the single tibial spur on 

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



Perisemus forniicoides Prov. 

 liethyhtsforiiiicoidcs Prov., Add. et Corr., p. 170; Cress. Syn. Ilym., p. 247. 

 9 . Length, 2.5 to .'>""". Black, ])olished; legs and antennae lioney- 

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



