3o6 Bulletin American Museum of NaUiral History. [Vol. XXI, 



the arid Southwestern and Pacific States. I have searched dihgently 

 but in vain for these ants in Texas, New Mexico, Arizona, and Colo- 

 rado. In these regions Dolichoderus is represented taxononiically as 

 well as ethologically by another genus of the same subfamily, Liome- 

 topum. D. plagiatus is almost subboreal in its distribution. It is 

 found as far north as Canada (teste Abbe Provancher) and when oc- 

 curring further south prefers sunny glades on hills or mountains. 

 D. marice is known to occur as far north as Connecticut (Emery), but 

 both this species and taschenbergi are properly members of the Caro- 

 linian zone. 



Descriptions of North American Dolichoderi. 



The workers of our different Dolichoderi may be identified with 

 the aid of the following table: 



I . Head and thorax with shallow foveolas, shining 2 



Head and thorax coarsely and deeply foveolate, subopaque 4 



2: Epinotal concavity with a strong median longitudinal ridge; head, 



thorax, and petiole yellowish red 3 



Epinotal concavity without such a ridge ; at least the head black 5 



3. Body hairless above '. D. marice Forel 



At least the upper surface of head and thorax with erect hairs marice 



davisi subsp. nov. 



4. Base of gaster with reddish-yellow spots plagiatus Mayr 



Gaster entirely black plagiatus var. inornatus var. nov . 



5. Without erect hairs on the upper surface; body and legs deep black or 



very dark brown 6 



With erect hairs on the upper surface; thorax reddish brown 7 



6. Body black or brown-black, legs dark brown taschenbergi Mayr 



Body and appendages deep black taschenbergi var. gagates var. nov. 



7. Base of gaster with reddish yellow spots plagiatus pustulatus Mayr 



Gaster entirely black pustulatus var. beutenmuelleri Wheeler 



Dolichoderus mariae Forel. 



Dolichoderus marice Forel, Bull. Soc. Vaud. Sc. Nat., XX, pp. 34, 35. $ 

 Dolichoderus m.arice Mayr, Verhandl. k. k. zool. bot. Gesell. Wien, XXXVI, 



1886, pp. 436, 437. § 9 

 Dolichoderus marice Dalla Torre, Catalog. Hymenop., VII, 1893, p. 159. 

 Dolichoderus marice Emery, Zool. Jahrb. Abth. f. System., VIII, 1894, p. 330. 

 Dolichoderus marice Emery, 27th Ann. Rep. State Board Agr. New Jersey 



(1899), 1900, p. 540. 

 Dolichoderus marice Wheeler, Bull. Am. Mus. Nat. Hist., XX, 1904, p. 304. 



Worker (Fig. A). — Length 3.5-4.5 mm. 



Head subelliptical, sides evenly rounded; occipital border rather straight; 

 eyes placed a little in front of the middle. Clypeus fiat, its anterior border 



