OF WASHINGTON, VOLUME XIV, 1912. 69 



Eciton (Acamatus) mexicanus F. Smith. 



This species was collected July 6, 1905, by A. McLachlan. 



MYRMICID.E. 



Pseudomyrma gracilis (Emery) mexicana Roger. 



These peculiar looking ants are always found near water 

 courses and lakes. The colonies are usually small. They have 

 never been seen with more than 30 in a colony. On May 

 25, 1909, a colony consisting of queens, males, workers, pupae, 

 and larvae was found in a dead limb of a live-oak tree. On 

 May 17, 1909, a similar colony was found with winged queen 

 and male, workers, and male and female pupae. On October 

 25, 1909, a colony consisting of only 3 workers, 4 larvae, and 

 2 pupae was found in a dead live-oak twig. On March 4, 

 1910, a single ant was taken on a willow tree. March 3, 1911, 

 two colonies were found in abandoned live-oak twig galls of 

 Amphibolips. Workers have been taken on grapevine De- 

 cember 19, 1910, and on mistletoe January 16, 1911. A colony 

 consisting of queen, 3 pupae, and 3 larvae of different sizes 

 was found in an empty blackjack acorn on the ground October 

 25, 1911 (Mitchell). 



Pseudomyrma pallida F. Smith. 



A colony of this yellow ant was found in a stem of Iva 

 ciliata January 17, 1910 (Mitchell). 



Pseudomyrma flavidula F. Smith. 



This species is usually found in the neighborhood of water 

 courses and lakes. The colonies are sometimes large. On 

 December 15, 1908, a colony consisting of winged forms, 

 workers, and larvae was found in a stem of Solidago. A nest 

 was found in the stem of a dead Xanthiii-m January 16, 1909. 

 On March 19, 1909, a colony of females, workers, larvae, and 

 eggs was found in a stem of Iva ciliata. On January 28, 1910, 

 a colony was taken in the stem of Ambrosia trifida, and in 

 another large stem of the same species several connected 

 colonies were found there were 3 or 4 queens. A colony was 

 found in a stem of h'ii ciliata February 12, 1910, and on 

 February 19 one was found in Ambrosia. March 16, 1911, 

 in a stem of Iva ciliata, a queen, 30 workers, and 61 immature 

 stages were found (Mitchell). 



Psudomyrma brunnea F. Smith. 



A small colony of workers and larvae was found in a dead 

 twig March 6, 1909. A worker was taken on mistletoe 

 January 16, 1911 (Mitchell). 



