[359] "^^^ TENTHREDINOIDEA 99 



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

 prosternum, 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. 



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



Family TENTHREDINID^. 



DOLERUS SERICEUS. 

 Dolerus sericeus Say, 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. 

 Dolerus aprilis Norton, Proc. Best. Soc. Nat. Hist., viii, p. 152, 1861. 



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

 Bay, June 2 1 ; Kukak Bay, July 4. This species is also widely 

 distributed in the United States and Canada. 



DOLERUS ELDER! sp. nov. 



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

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

 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. W. Elder^ in which the Harri- 

 man Expedition made their home during the voyage. 



