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 pnnctate 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 on]y on the mandibles, coxse 
and front. 
Color black; covered with a silvery air film. 
Described from a single specimen, 57 in the Klebs Coli. 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 antennse. 
At first sight one would be inclined to regard this ant as a 
Dimorphomyrmex , but the distinctly 10-jointed antennse, 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 antennse in 
the worker and 10-jointed antennse in the female, because the frontal 
carinse 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 antennse, were 
it not that I believe that this species and the allied A. hewitti Wheeler 
of the same island, another form with 8-jointed antennse 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. 
(Ecopliylla brischkei Mayr. (Fig. 55.) 
(Ecophylla brischkei Mayr, Beitr. Naturk. Preuss. I, 1868, p. 81, Tat. I, Fig. 12, 13. 
(E. brischkei Dalla Torre, Catalog. Hymen. VII, 1893, p. 176; Ern. Andre, Bull. 
Soc. Ent. Franee, XX, 1905, p. 83 ; Handlirsch, Foss. 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 
Schriften d. Physikal.-ökonom. Gesellschaft. Jahrgang LV. 8 
