THE TENTHREDINOIDEA 



359 



pronotum, basal plates, spots in center of apical segments of tergum, 

 presternum, pectus, venter basally and along margins, and coxae, 

 black ; legs ferruginous ; wings yellowish hyaline, nervures, including 

 stigma and costa, reddish yellow. 



One female, St. Paul Island, Alaska, August 13. 



Tvfe no. 5306, U. S. National Museum. 



Family TENTHREDINIDiE. 



DOLERUS SERICEUS. 



Dolerus sericetis S>\\' , Keatings, Narr. Exped. 11, p. 320, 1824. App. 



Four females and ten males: Yakutat, June 21 ; Berg Bay, June 

 II ; Sitka, June 16; Virgin Bay, June 20; Kadiak, July 21. This 

 species is widely spread throughout the United States and Canada. 



DOLERUS APRILIS. 



JDolertis apnVt's NoRTOS, Proc. Bost, See. Nat. Hist., viii, p. 152, 1861, 



Seven females: Orca, June 27; Virgin Bay, June 26; Yakutat 

 Bay, June 21; Kukak Bay, July 4. This species is also widely 

 distributed in the United States and Canada. 



DOLERUS ELDERI sp. nov. 



Female: Length 6 to 6.5 mm.; head and thorax strongly punc- 

 tured, clothed with long sericeous pile ; abdomen broad, sviddenly 

 narrowed at apex; clypeus deeply and circularly emarginate ; an- 

 tennae not quite so long as head and thorax, slender, scarcely tapering, 

 third joint longer than fourth ; stigma broadest near base, gently 

 rounded below, truncate at apex ; sheath broad at base, tapering to a 

 rather sharp point. Color black; broad band on abdomen, including 

 the greater part of segments two to five, sanguineous ; legs black, 

 tips of anterior and medial femora and basal half of fore tibiae, reddish ; 

 wings hyaline, nervures and stigma dark brown. 



Male : Length 6 to 6.5 mm. ; resembles the female in general 

 structural characters ; colored as in the female, but the basal half of 

 the medial and posterior tarsi are reddish. 



Two females and four males, Popof Island, July 10; Kukak Bay, 



July 3- 



Type no. 5307, U. S. National Museum. 



Named in honor of the ship Geo. IV. Elder., in which the Harri- 

 man Expedition made their home during the voyage. 



