1911] Mann — Some Northwest ern Ants and Their Guests 109 



of the known American species. It appears to be nearest to H. 

 minimus Fall, from which it differs in the inconspicuous punct- 

 ation and pubescence, the narrow femora and more concave 

 front. In these characters it approaches H. brunneipennis. It 

 can be separated from this species by the smaller size, more elon- 

 gate body and total absence of long yellow hairs. In brunneipennis 



Fig. 3. Hatwrius exiguus sp. nov. 



the margin of the pronotum is more noticeably punctured than 

 the disc, while in minimus and exiguus there is no appreciable 

 difference. 



In the same specimens the elytral hairs are more noticeable and 

 can be seen the entire length of the striae, becoming stronger 

 posteriorly. There exists a wider variation in color than is common 

 in the genus. The elytra and pronotum are seen to be irregularly 

 punctate. 



