172 ASHMEAD 



median and submedian veins in the hind wings, yellow; areolet open 

 behind. The lateral depressions of the scutellum, the mesopleura 

 superiorly, just beneath the insertion of the wings, and the petiole of 

 the abdomen, are striated. 



Type. Cat. No. 5563, U. S. Nat. Museum. From St. Paul 

 Island, August (Fur Seal Commission). Three specimens. 



EXOLYTUS POPOFENSIS sp. nov. 



Female. Length 6 mm. Polished black, impunctate, the meso- 

 pleura superiorly beneath the insertion of the wings and the petiole of 

 the abdomen not striated ; pedicel at apex and the ring-joint flavo- 

 testaceous ; legs more or less black, with the sutures of trochanters, 

 tips of front and middle femora (the former almost wholly beneath), 

 their tibia? and tarsi and the hind tarsi, testaceous ; hind tarsi fuscous, 

 the joints of the anterior and middle tarsi are also sometimes more or 

 less subfuscous. Antenna? 2i-jointed. Wings hyaline, the stigma and 

 veins brown, as in E. perplexus. 



Male ( ?) Length 4 mm. Agrees well with the female, except 

 that the mesopleura beneath the wings and the petiole of the abdomen 

 are coriaceous and not perfectly smooth and polished as in the opposite 

 sex. 



Type. Cat. No. 5564, U. S. Nat. Museum. From Popof Island, 

 August (Fur Seal Commission). 



EXOLYTUS NIGER Ashmead. 



Exolytus niger ASHMEAD, Fur Seals and Fur Seal Islands, Pt. iv, p. 338, 9 , 

 1899. 



Type. Cat. No. 4041, U. S. Nat. Museum. From Bering Island 

 (Dr. Stejneger) ; Alaska, Pribilof Islands (F. A. Lucas). 



EXOLYTUS SANCTIPAULI sp. nov. 



Female. Length 4 to 4.5 mm. Polished black and in color and 

 sculpture is very nearly a counterpart of E. perplexus from which it 

 may, however, be easily distinguished bv having only 2O-jointed an- 

 tennae, by the areolet in the front wings being closed by an hyaline, 

 although distinct, vein, and by the less distinctly striated petiole of 

 the abdomen. Two or three of the specimens have the legs colored as 

 in E. popofensis. 



Type. Cat. No. 5565, U. S. Nat. Museum. From St. Paul Island, 

 July 21 (Fur Seal Commision) ; Popof Island, July 9, 10. 



