-j^^ PROCKEDINGS OF THE NATIONAL MUSEUM vol.69 



The following are omitted from this table: Eusimulium ohtusum, 

 'pugetense, and cam,07iicolum. 



EUSIMULIUM AUREUM (Fries) 

 mmulm- ourcuK Fiues, Monogr. Simul. Suec. 1824, p. 16. 



The bright, brassy, scale-like body pile and the patch of brassy 

 scales on the postnotum characterize both sexes of this species. The 

 legs including the fore coxae are largely light yellow; the fore tarsi 

 of the female are broadened, the fore tibia has silvery pile; the hind 

 basitarsus has the apical projection; the second hind tarsus has the 

 dorsal incision and the claws are provided with a dorsal tooth. 



Female hypopyginm. Cerci large, quadrate, transverse, setose. 

 Oth sternites chitinized, curved, rather small, rounded, sparsely setose 

 on the margin only. Ovipositor (laps conical, remote at tips, weakly 

 membranous, spicular. Genital rod widely forked, each arm ex- 

 panded into a plate carrying a large blunt tooth. (Fig. 44.) 



No male is before us, unless the species hereinafter described as 

 Eusimulium ohtusum is the missing male of the form we here iden- 

 tif V as aureum Fries. 



Eusimulnim aureum occurs commonly in Europe where it was 

 originally described, and is recorded from North Africa. It is not 

 known to be a blood-sucker and is rather rarely collected in Nortli 



America. 



Type locality.— Vi\kno^si\ to us, as is the present location of type. 

 DistHhution.—Ai.A^KA : Katmai, August, 1917 (J. S. Hine) . Savo- 

 noski, Nanek Lake, June, 1919 (J. S. Hine). 

 California: Los Angeles County (D. W. Coquil 



lett). Palo Alto, April 11 (J. M. Aldrich). 

 CoLOKADo: Boulder (T. D. A. Cockerell). 



EUSIMULIUM AUREUM BRACTEATUM (Coquillett) 



Simulium hmcteutmn Coquillett, U. S. Dept. Agr. Bur. Eiit., Bull. 10. n. s. 



p. 69, 1899. ^^ , ^ 



SimuUum bracteatum Malloch, U. S. Dept. Agr. Bur. Ent.. Tech. Ser. 



No. 26, 1914, p. 38. 



Superficially similar to aureuvi; in the female hypopygium the 

 ovipositor flaps are smaller, the ninth tergites less rounded and with 

 a ventral point. 



Male hpyopygium: Side piece large, conic, quadrate, a chitmized 

 bridge and reentrant arm on one side. Clasper small, angled, with 

 stout terminal tooth. Adminiculum small, conic-pointed, hirsute, the 

 basal prongs triangularly widening, divaricate. Adminiculum arms 

 with a convex membrane and two large teeth, divaricate from its 

 base. (Figs. 24, 25, and 26.) 



