3IO Bulletin American Museum of Natural History. [Vol. XXI, 



straight and transverse or slightly impressed in the middle. Gaster broad, 

 somewhat flattened above, with straight anterior border and a somewhat 



deeper constriction between the 

 first and second than between 

 the succeeding segments. 



Sculpture like that of D. 

 m-arics, except that the foveolee 

 on the meso- and epinotum are 

 somewhat more pronounced. Tn 

 the mesoepinotal constriction 

 there are a number of regular 

 longitudinal ridges separated by 



Fig. B. Dolichoderus taschenbergi Mayr. Worker. shining depressions. Epinotal 



concavity without a pronounced 

 median carina, although the surface is longitudinally striated. Meso- and 

 epinotum opaque or subopaque, pronotum and head shining, gaster very 

 glabrous. 



Pilosity and pubescence as in the typical inarta;. 



Brownish black, antennas, edges of mandibles, and legs dark brown. 



Types from Louisiana. The species occurs also in Missouri as 

 Emery has shov^n. The above description is drawn from a single 

 specimen from the latter State in my collection. 



Dolichoderus taschenbergi Mayr var. gagates var. nov. 



Worker. — Differs from the typical form in being deep jet black throughout, 

 with the exception of the edges of the mandibles and the strigils of the fore 

 tibiec, which are yellowish, and the neck of the pronotum which is brownish. 

 The sculpturing of the head and pronotum seems to be less pronounced than 

 in the typical form, so that these parts are smoother and more shining. The 

 gaster is very glabrous. 



Described from numerous workers collected at Lakehurst, New 

 Jersey. The same form occurs at lona (Erich Daecke), Clementon 

 (H. L. Viereck), and Jamesburg (Wm. T. Davis) in the same State. 



Dolichoderus plagiatus Mayr. 



Hypoclinea plagiata Mayr, Verhandl. k. k. zool. bot. Gesell. Wien, XX, 1870, 



p. 960. 

 Dolichoderus plagiatus Mayr, Verhandl. k. k. zool. bot. Gesell. Wien, XXXVI, 



1886, p. 436. $ 

 Dolichoderus horealis Provancher, Natural. Canad., V, 18, 1888, p. 408. § 

 Dolichoderus plagiatus Dali.a Torre, Catalog. Hymenopt., VII, 1893, p. 160. 

 Dolichoderus plagiatus Emery, Zool. Jahrb. Abth. f. Syst. VIII, 1894, p. 330. 

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



(1899), 1900, p. 540. 



Worker (Fig. C). — Length, 3-3.5 mm. 



Head elliptical; eyes rather large, in front of its middle. Clypeus convex. 



