The Ants of the Baltic Amber. 27 



Male. Length (without gaster) 8 mm. 



A single imperfect specimen, XIII B 924 of the Geolog. Inst. 

 Koenigsberg Coll. unquestionably belongs to this species. It lacks the 

 gaster, one antenna, the terminal joints of the other and the tips of 

 the wings. Head short and broad, with very large, subspherical eyes 

 and prominent ocelli. Mandibles small, far apart and with a single, 

 acuminate tooth at the apex. Maxillary palpi very long, 6-jointed, 

 labial palpi 4-jointed. Clypeus convex in the middle behind, not pro- 

 jecting, with straight, transverse anterior border. Antennji? very long, 

 filiform; scapes very short, little more than twice as long as broad, 

 somewhat thicker than the remaining joints, second joint (first funi- 

 cular) broader than long, not swollen; remaining joints (8 of which 

 are preserved) subequal, cylindrical, fully 6 times as long as broad. 

 Thorax slender, through the wing insertions as broad as the head 

 through the eyes. Mesonotum with distinct Mayrian furrows. Scu- 

 tellum convex and rounded in the middle, broadly concave on the sides 

 (as in Myrmecia). Epinotum from above as long as broad, with con- 

 cave sides and armed with two blunt teeth. Petiole, postpetiole and 

 legs very similar to those of the worker. Venation almost exactly like 

 that of Myrmecia in both anterior and posterior wings; apterostigma 

 small. Sculpture and pilosity as in the worker, but the hairs are 

 shorter and less conspicuous. Body blackish or dark brown and more 

 or less decomposed. Wings somewhat yellowish. 



The long legs, strong claws and remarkable mandibles of the 

 worker indicate that P. longiceps was a predaceous, and in all pro- 

 bability, an arboreal ant. It seems to have been the sole survivor 

 during Lower Oligocene times of a very primitive Mesozoic group of 

 Poneriuce. There can be little doubt that the Myrmecke of Australia 

 and the neighboring islands are the only living descendants of this 

 old group. 



Tribe Cerapachyini Forel. 

 Genus Pi'ocefapacJu/s, gen. nov. 



Allied to Cerapachys, Sphiudomyniiex and Lioponera. The general 

 shape of the body of the worker is that of typical species of the first 

 of these genera. Mandibles convex, pointed, with oblique, toothless 

 blades. Maxillary palpi 5-jointed; labial palpi 4-jointed. Frontal 

 carinae prominent, erect, not covering the antennal insertions, parallel 

 in front, converging behind, about 1/3 as long as the head, separated 

 by a concavity as broad as the antennal scape. Cheeks with a distinct 



