14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



long as vertex or slightly less; female with posterior margin of ab- 

 dominal sternum VII truncate or occasionally slightly produced 

 apically; aedeagus broad basally, shaft with only basal three-fourths 

 narrowed. 



Paratype male from Arizona located in the Belong collection has 

 been examined. Additional specimens were from Arizona (June to 

 Sept.), Colorado, New Mexico (June and July), and Mexico (Sept.). 



B. impicta arizona Davidson and DeLong is herein considered a 

 western subspecies of B. impicta (Van Duzee) since the only definite 



Figure S. — B. impicta arizona: a, aedeagus, lateral view; b, female abdominal sternum VII, 



ventral view. 



morphological difference is found in the base of the aedeagus which is 

 not narrowed as abruptly as in impicta. The subspecies is also 

 generally larger in size. 



Balclutha arctica Beirne 



Figure 6 

 Balclutha arctica Beirne, 1950, Canadian Ent., vol. 82, p. 124. 



Length of male 4.0 to 4.6 mm, of female 4.5 to 5.0 mm; head width 

 of male .900 to 1.000 mm, of female ,950 to 1.000 mm; pronotal wddth of 

 male .975 to 1.100 mm, of female .975 to 1.150 mm. 



Head narrower than pronotum; vertex longer medially than next to 

 eye, interocular width more than three times median length; ocellus 

 located at a distance of from twice its diameter or farther from eye; 

 anteclypeus parallel margmed or sUghtly \nder apically, usually 

 shghtly exceeding gena; postclypeal sutures parallel above antennal 

 pits; pronotum more tlian three times as long as vertex; hind femoral 

 chaetotaxy 2-2-1 ; female with posterior margin of abdommal sternum 

 VII truncate posteriorly. 



