SIMULIUM. 37 



Type locality, Red Hill, Moultonburgh, X. H., August 5 (H. G. 

 Dyar). There are specimens from Skyland, Page County, Va., July 

 15, 1912 (H. G. Dyar), and White Mountains, N. H. (Morrison). 



The male and the early stages are unknown. 



Simulium arcticum, now si)ec'ies. 



Fetmile. — Black; frons shining, very slightly dusted with white, 

 face thickly white dusted, antennae with two basal joints yellowish. 

 Scutum with two large and generally distinct wliite pollinose spots 

 on anterior angles of scutum, the latter slightly shining; pre- 

 scutum brownish; scutellum concolorous with scutum; pleurie sub- 

 opaque, distinctly white-dusted, especially on lower portions. Abdo- 

 men black, opaque on basal four segments, shining on apical four. In 

 some specimens distinctly gray-dusted laterally and posteriorly on 

 basal five segments. Legs yellow, black as follows: Femora except 

 bas&s, tibiae at apices and tarsi of fore legs; coxae, femora except 

 bases, apical third of tibiae, and apices of first tarsal joint of mid and 

 hind legs ; last four joints of mid tarsi, except extreme base of second ; 

 last four joints of hind tarsi except basal half of second. Wings 

 clear, thick veins brownish. Ilalteres yellow, brownish at base of 

 stalk. 



Frons with sides very slightly divergent, unusually broad at anten- 

 nae above, occupjdng about one-fourth the width of head, at vertex 

 about one-third as wide as head, surface hairs only on lateral mar- 

 gins; besides the scale-like hairs there are also present some black, 

 upright hairs ; face as broad as frons at vertex, and about one-third 

 longer than broad, surface hairs whitish, absent from upper third, 

 antennal pilosity pale; palpi black, hairs black-brown; postoculai; 

 cilia pale, with a few intermixed black hairs on lower portions. 

 Scutum covered with close-lying whitish or yellowish pilosity 

 which is regularly arranged and rather long; prescutellar depression 

 of scutum with numerous long, upright, black hairs; pleural tuft 

 pale; scutellum with pale scale-like pilosity and numerous long, 

 upright, black hairs. Abdominal basal scale paler than rest of abdo- 

 men, the fringe long and pale, surface hairs on apical segments pale 

 and on lateral margins a number of long black hairs. Legs with 

 rather long, close-lying, pale pilosity and numerous long, upright, 

 black dorsal hairs, those on apices of first and third fore tarsal joints 

 not con.spicuous; claws with subbasal tooth (see PI. II, fig. 4). Wing 

 venation as in pamassum. 



Length, 3-4 mm. 



Type. — Cat. No. 15-410, U. S. National Museum. 



Tj'pe locality, Kaslo, British Columbia (H. G. Dyar). Also from 

 London Hill Mine, Bear Lake, British Columbia (R. P. Currie). 



The male and the earlv stages are unlmown. 



