124 FAMILY KVANIID^. 



and have concluded that they may be recognized. Although closely 

 related and apparently intergrading, certain specimens being of 

 questionable identity, they may for the most part be separated by 

 the following table. Rufitarsis, editus, and minor are western, 

 abdominalis and bilobatus eastern. Both east and west they seem 

 to be the commonest species of the subfamily, especially editus and 

 rufitarsis in the west. 



1. Abdomen with the apical half black (2). 



Abdomen red, the very apex occasionally dusky or black (4). 



2. Posterior femora and tibise dark brown ; abdomen with the second and the 



apex of the first segments dull claret-red ; wings clear hyaline. Hab. 



Canada to Virginia bilobatus Provancher, ^ , 9 • 



Legs black, except tarsi are yellowish ; abdomen more of a brick-red ; wings 



stained smoky. Hab. — Eocky Mountains and west. 



riifitari^is Cresson, % . 

 Legs red or yellowish ; abdomen brick-red or yellowish. Hab. — Washington 



and Nevada (3). 



3. Legs obscurely yellowish or rufous; posterior tibise and tarsi brown; species 



slender Iiliiioi* Cresson, 'J, , 9 • 



Legs all yellowish ; species more robust edit MS Cresson. % . 



4. Legs all black, except posterior tarsi. Hab. — Colorado. 



riifilarsis Cresson, ?. 

 Legs, at least four anterior pairs, rufous (5). 



5. Posterior femora black or dark brown. Hab. — Canada and New England. 



abdominalis Cresson, 9- 

 Posterior femora and sometimes tibise red ; wings often smoky, with violaceous 

 reflection. Hab. — Nevada and California to British Columbia. 



edit IIS Cresson, 9 • 



Odontaulacus editus Cresson (Fig. 24). 

 Nevada; Washington (Easton, T. Kincaid ; Blue Mountains, 

 July 15, '96, coll. C. V. Piper) ; California (Santa Cruz Mountains); 

 British Columbia (Revelstoke, Selkirk Mountains, 26 spec, collected 

 by the author, July 8, '05. 



Odoiitaulaeus rufitar.sis Cresson. 

 Colorado ; Washington (Easton, T. Kincaid), 



Odontaiilaciis abdominalis Cresson. 

 Georgia; Canada; New Hampshire (Webster, coll. W. F. Fiske). 



Odoiitaulaciis bilobatus Provancher (Fig. 25). 

 Canada (Terrebonne, P. Q., July 20, 1901, coll. C. J. Oueliet) ; 

 West Virginia (Dr. A. 1). Hopkins). 



