The Ants of the Baltic Amber. 113 



Smooth and shining; anterior portion of head finely and very 

 sparsely punctate; thorax and gaster under a lens of 20 diameters, 

 very delicately shagreened. Mandibles punctate with 4 or 5 longi- 

 tudinal furrows, most distinct at the dentate borders. Cheeks ante- 

 riorly, front and apparently also the sides of the clypeus very finely 

 striated; cheeks also densely punctate. 



Erect hairs very sparse, visible only on the mandibles, coxae 

 and front. 



Color black; covered with a silvery air film. 



Described from a single specimen, 57 in the Klebs Coll. This 

 specimen lacks the gaster behind the base of the first segment and 

 has several air -bubbles on the surface and enveloping the clypeus 

 and tips of the antennae. 



At first sight one would be inclined to regard this ant as a 

 Dimorphomyrmex, but the distinctly 10 -jointed antennae, smaller eyes 

 and differently shaped thorax remove it from this genus. It is equally 

 difficult to assign it to the genus Aphomomyrmex Emery, one of the 

 African species of which, A. afer Emery, has 9 -jointed antennae in 

 the worker and 10-jointed antennae in the female, because the frontal 

 carinae in this genus do not run to the anterior orbits but terminate 

 on the front mesially of the eyes. I believe, therefore, that the amber 

 form may be properly regarded as the type of a new genus which 

 is more primitive than, though closely related to Dimorphomyrmex. 

 I should, however, have placed P. primigenius in Dimorphomyrmex for 

 the same reason that Emery extended the scope of Aphomomyrmex 

 to embrace A. andrei of Borneo with only 8 -jointed antennae, were 

 it not that I believe that this species and the allied A. hewitti "Wheeler 

 of the same island, another form with 8 -jointed antennae in the worker 

 and female, will probably have to be assigned to a new genus when 

 more material of these and of the African species has been care- 

 fully studied. 



Tribe Oecophyllini Forel. 



Genus (Ecophylla F. Smith. 



CEJcophylla brisclikei Mayr. (Fig. 55.) 



(Ecophylla br'ischkei Mayr, Beitr. Naturk. Preuss I, 1868, p. 31, Taf. I, Fig. 12, 13. $. 



(E. brischkei Dalla Torre, Catalog. Hymen. VII, 1893, p. 176; Ern. Andre, Bull. 



See. Ent. Franee, XX, 1905, p. 83; Handlirsch, Fobs. Insekt. 1908, p. 860. 



Worker. Length: 4,5 — 8 mm. 



Head convex above, excluding the mandibles longer than broad, 

 broader behind than in front, with rather straight sides and posterior 



Schiiiten d. Pbysikal.-dkonoin. Gegellscbaft. Jahrgang LV. o 



