lOO CHAPTER I 



HILAIRA FRIGIDA Thor. 



Jan Mayen, Icel., Faeroes, Brit. Isl., N Labr., Baffin L., Greenl. 

 Eur.;' Kamch. 



HILAIRA (utopiellum) herniosa Thor. {mirabiUs L. Koch, consimilis Cambr.) 

 Eur. (boreoalpine), W Sib. Arct. Can., Nfld. 



HYPSELISTES FLORENS Cambr. 

 Brit. Isl., W Sib. Alas., S Can., N U.S.A. 



ISLANDIANA (ADUVA) ALATA Em. 



N Scand. Alas.-NE U.S.A. (mts.), S to Wyom.; 



Nfld. 



MASO (caseola) sundevalli Westr. {herbicola Em.) 



Icel., Brit. Isl., Eur. (widely). Sib. Alas., NE U.S.A., E Can., Nfld. 



E to Kamch. 



MONOCEPHALUS (thyreosthenius, hormathion) PARASITICUS Westr. {becki Cambr., 



limnatus Cby. & Bish.) 



Icel., Brit. Isl., N & C Eur. NE U.S.A., W to Wise, Nfld. 



MINYRIOLOIDES TRIFRONS Cambr. 



/. typ. sbsp. aquatilis Cby. & Bish. (affinis 



Schenk.) 

 Brit. Isl., N & W Eur.; Kamch. New York. 



POCADICNEMIS PUMILA Blackw. 



Brit. Isl., Eur. (generally), E to Moscow, Alas.-E Can., N U.S.A. 



RHAEBOTHORAX (typhochraestus) borealis Jacks. (incl. thori Jacks.) 

 Spitzb., Icel., N Scand. Labr., Greenl. 



RHAEBOTHORAX PAETULUS Cambr. 



Eur. (boreoalpine). Alas.; Greenl. 



SISICUS APERTUS Holm {longitarsi Ch. & Iv.) 

 N Scand., Switzerl. Alaska. 



TIBIOPLUS NEARCTICUS Ch. & Iv. 



N Sweden. Alaska. 



