The Ants of the Baltic Amber. 
65 
Leptothorax longcevus, sp. nov. 
Worker. Length about 2,25 mm. 
Head and eyes rather large. Antennse 12-jointed; funicular joints 
2 — 8 much broader than long. Thorax stout, not much narrower 
behind than in front, with a distinct constriction, both dorsally and 
laterally, at the mesoepinotal suture. Epinotum with the base sorne- 
what longer than the declivity, armed with two stout, blunt teeth, which 
are as broad at the base as long, compressed dorsoventrally and 
directed backward. Petiole short and stout, less than twice as long 
as broad, apparently unarmed below; node in profile rather acutely 
angular, with subequal, concave anterior and posterior slopes. Seen 
from above the border of the node is straight and transverse, Post- 
petiole small and rounded, not broader than the petiole. Gaster small, 
elliptical. Femora and tibise only slightly incrassated. 
Mandibles and cheeks longitudinally rugose. Head delicately 
longitudinally rugulose and with large, soattered punctures. Thorax, 
petiole and postpetiole densely punctate, the meso- and metapleurae 
more coarsely; pro-, meso- and epinotum above longitudinally rugulose. 
Gaster and legs smooth and shining, with much scattered, minute, 
piligerous punctures. 
Erect hairs sparse, stout and clavate, short on the thorax, longer 
on the petiole, postpetiole and gaster; hairs on the scapes and legs 
very delicate and appressed. 
Color blackish; surface covered with a silvery air film. 
This species, which is very distinct in the shape of the thorax, 
epinotal teeth and in sculpture, is described from a single specimen, 
without a number, in the Geolog. Inst. Koenigsberg Coli. 
Leptothorax hystriculus, sp. nov. 
Worker. Length about 2,5 mm. 
Body slender. Head distinctly longer than broad. Eyes moderately 
large. Mandibles 5-toothed. Clypeus convex in the middle, with broadly 
rounded, entire anterior border. Antennse 12-jointed; joints 2 — 5 of 
the funiculus much broader than long. Thorax narrowed behind, with 
a very distinct constriction at the mesoepinotal suture. Epinotum with 
two stout, rather blunt spines, which are fully as long as the base of 
the epinotum and longer than their distance apart at the base, directed 
backward and slightly upward and curved downward towards their 
tips. Petiole fully twice as long as broad, in profile with a rather 
low, rounded node, its ventral surface without a spine. Postpetiole 
Schriften d. Physik. -Ökonom. Gesellschaft. Jahrgang LV. 5 
