388 Bulletin American Museum of Natural History. [Vol. XXI, 



bugs, and thence tracing them as they move homeward in unin- 

 terrupted files often over considerable distances (30-50 ft.). It is 

 probable that the number of plant-lice and mealy-bugs within a 

 radius that can be conveniently patrolled by a single colony of maricB 

 is far from sufficient to supply its thousands of workers with food. 

 Hence the colonies must from time to time move to new localities 

 and establish fresh nests. This is easily accomplished owing to the 

 ease and rapidity with which the sand can be excavated by a populous 

 colony. D. maricB is a pugnacious ant and when disturbed emits 

 from its anal gland a peculiar volatile, smoky excretion which is un- 

 like that of our other Dolichoderine genera (Tapinoma, Dorymyrmex) . 

 The males and winged females are found in the nests during the latter 

 part of August. For additional notes on this and the following 

 Dolichoderi see my paper: 'The North American Ants of the Genus 

 Dolichoderus,' Bull. Am. Mus. Nat. Hist., Vol. XXI, 1905, pp. 305- 



319- 



44. D. marise davisi Wheeler. — Jamesburg (Davis). 



The worker differs from that of the typical form in having erect 

 hairs on the head and thorax, which are also of a somewhat browner 

 color. Only the base of the first gastric segment is yellow and the 

 lateral spots on the second are barely indicated. 



45. D. taschenbergi Mayr var. gagates Wheeler. — lona (Daecke) ; 

 Jamesburg (Davis) ; Clementon (Viereck) ; Lakehurst (Davis and 

 Wheeler) . 



This form' is as common in the pine barrens as D. marice- and has 

 very similar habits. 



46.. D. plagiatus Mayr. — lona (Daecke); Jamesburg (Davis); 

 Riverton (Viereck) ; Lakehurst (Wheeler) . 



Like D. m,ari(B and gagates, this species nests in the ground and 

 attends Aphides on the leaves of trees and bushes. Its colonies are 

 very small. 



47. D. plagiatus var. inornatus Wheeler. — This variety, which 

 occurs at Lakehurst, differs from the typical form in lacking the 

 yellowish spots on the gaster. 



48. D. plagiatus pustulatus Mayr. — This variety occurs at Lake- 

 hurst. It differs from the typical plagiatus in having the head and 

 thorax more shining and less deeply foveolate. 



49. D. plagiatus pustulatus var. beutenmuelleri Wheeler. — This 

 variety occurs at Lakehurst. It differs from the typical pustulatus 

 in the same way as the variety inornatus differs from the typical 

 plagiatus, namely in lacking the yellowish spots on the gaster. 



