NORTH AMERICAN HYMENOPTERA. 181 



The species of this family, so far known to me, may he tabulated 

 as follows : 



Genus 1, PSAMMOTHERMA Latr. 

 Aiiteunte flabellate % ajax. 



Genus 2, I»IUTIL,L,A Linn. 



MALES. 

 Anteunfe simple. 



Eyes ovate, more or less acutely emarginate within. 

 Abdomen more or less fulvous or ferruginous. 



Head and thorax black, with pubescence entirely black. 



Abdominal segments fringed at apex with ferruginous pubescence, first 



segment black hexagona. 



Abdominal segments fringed at apex with golden pubescence, first seg- 

 ment black Grotei. 



Head, thorax and base, and apex of abdomen black ; abdomen clothed with 



bright scarlet pubescence tertiiiiiata. 



Abdominal segments fringed at apex with golden pubescence. .oajaca. 

 Head, thorax and basal segment of abdomen black, the remaining segments 

 ferruginous, apical margins fringed with ferruginous pubescence. 



ordinaria. 

 Abdominal segments fringed at apex with silvery white pubescence. 



copano. 

 Head black ; pro- and mesothorax and abdomen ferruginous ; segments 



fringed at apex with black pubescence Sayi. 



Head black ; thorax and abdomen ferruginous, fringed with ferruginous 



pubescence florideiisis. 



Head and thorax black above ; abdomen rufo-castaneous ; segments fringed 



with fuscous eximia. 



Head and thorax above reddish brown ; abdomen ferruginous ; segments 



fringed at apex with black pubescence promethea. 



Abdomen rufous, with long rufous pubescence rtlTa. 



Head and thorax black; abdomen ferruginous, fringed with black pubes- 

 cence contracta. 



Head ochraceous, thorax black, mesothorax brown ; abdomen ferruginous : 



segments fringed at apex with whitish pubescence senex. 



Black ; head thinly covered with white yiubescence, apical margins of 

 abdominal segments sparsely fringed with white pubescence ; wings 



fuscous nana. 



Abdomen black, banded with .silvery pubescence. 



Head with short gray pubescence ; second segment of abdomen subopaque, 

 with large, coarse jjunctures ; first and second segments with an 

 apical band of silvery pubescence, remaining segments with mixed. 



black and silvery pubescence scrupea. 



Head with long, dense, silvery pubescence ; pleura and metathorax also 

 silvery ; second segment of abdomen shining, with less coarse punc- 

 tures ; first segment entirely and broad apical margin of second seg- 

 ment .silvery, the whole abdomen with long, silvery pubescence. 



gracilis. 



