182 



Journal New York Entomological Society. [Voi. xvii. 



large root-aphids of both sexes and in all their developmental stages. 

 After careful search I found the obese Ancrgatcs queen, but she was 

 dead and somewhat shriveled, and her thorax had been separated from 

 her gaster. She had probably been killed by the Tcframorium 

 workers, which were dividing their attention between bringing up 

 her larvae and attending the aphids. 



Fig. 2. A, adult larva of Auergatcs atrahilus ; a and b, long, serrate and 

 short, branching hair of same, more highly magnified ; B, adult worker larva 

 of Tetramorium cespitiim ; c and d, long, anchor-tipped, dorsal hair and short, 

 branching hair of same, more highly magnified. 



As collectors are always interested in the various parasitic ants 

 that live with Tetramorium, I may here introduce a few suggestions 

 that may aid them in detecting infested colonies. In the first place, it 

 is advisable to concentrate one's attention on a locality in which 

 Tetramorium colonies are unusually abundant. In the second place, 

 the collector should examine the nests at the height of the breeding 

 season, that is, during June and July at the lower, and early in August 

 at the higher altitudes, when the normal colonies contain larvx and 

 pupae of all three phases. He may safely pass over at once all 

 colonies containing the larger male and female larv?e and pup?e of 

 the Tetramorium, as such colonies do not contain Anergates or any 

 of the species or subspecies of Strongylognathiis (testaeeiis, hiiberi. 



