1905.] Wheeler, Ants of the Genus Dolichoderus. 313 



Dolichoderus plagiatus Mayr var. inomatus var. nov. 



Worker. — Differs from the typical form in having the gaster entirely black, 

 without any indications of the reddish yellow spots of the typical form. 



Eight workers from Rockford, Illinois, and a single worker from 

 Lakehurst, New Jersey. 



Dolichoderus plagiatus pustulatus Mayr. 



Dolichoderus pusHtlatus Mayr, Verhandl. k. k. zool. bot. Gesell. Wien, 



XXXVI, 1886, pp. 435. 436. 9 

 Dolichoderus pustulatus Dalla Torre, Catalog Hymenopt., VII, 1893, p. 160. 

 Dolichodertis pustulatus Emery, Zool. Jahrb. Abth. f. Syst., VIII, 1894, p. 330. 

 Dolichoderus pustulatus Ashmead, 27th Rep. State Board of Agr. New Jersey 

 (1899), 1900, p. 540. 



Worker. — Length, 3-3.8 mm. 



Differs from the typical plagiatus in its smaller size, less pronounced sculp- 

 ture and more vmiform coloration. Head and thorax shining, with smaller and 

 more scattered foveolse, except the epinotum, which is coarsely foveolate. 

 Thorax and petiole darker, often nearly black; the spots on the gaster are 

 smaller. There are no erect hairs on the antennal scapes. 



Female. — "Length, 4.4 mm. 



"Coloration like that of the worker, but the mesonotum, scutellum, and 

 mesopleurae are blackish brown. Pilosity and sculpture as in the worker, but 

 mesonotum with finer, coriaceous rugosity, and shallower, more scattered 

 foveolae. The convex basal epinotal surface is separated from the strongly 

 concave declivity by a very prominent transverse ridge, which is feebly emar- 

 ginate in the middle." (Mayr.) 



Recorded by Mayr from New Jersey, District of Columbia, and 

 Virginia. Three workers from Dacosta, New Jersey, from the collec- 

 tion of the American Entomological Society, belong to this subspecies. 

 Mayr included the following variety in his description, as is evident 

 from his mentioning specimens without spots on the gaster. 



Dolichoderus plagiatus pustulatus Mayr var. beutenmuelleri Wheeler. 



Dolichoderus plagiatus Mayr var. beutenmuelleri Wheeler, Bull. Am. Mus. 

 Nat. Hist., XX, 1904, p. 304. $ 



Through a lapsus calami in my paper on the ants of North Carolina, 

 this variety was attached to plagiatus proper instead of to its sub- 

 species pustulatus. From this form it differs merely in the absence 

 of any reddish-yellow markings on the gaster and hence in exactly 

 the same way as the var. inomatus differs from the typical plagiatus. 

 The antennal scapes have a few conspicuous erect hairs, especially 

 on their flexor surfaces. 



The types are from the Black Mountains of North Carolina (Wm. 

 Beutenmuller). I have also taken several workers in various localities 



