[359] THE TENTHREDINOIDEA 99 



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

 prosternum, pectus, venter basal ly 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. n, 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. Bost. Soc. Nat. Hist., vm, 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, 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. 



