The Ants of the Baltic Amber. g5 



Leptothorax louffwviis, sp. nov. 

 Worker. Length about 2,25 ram. 



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 some- 

 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 lone 

 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 tibiae only slightly incrassated. 



Mandibles and cheeks longitudinally rugose. Head delicatelj- 

 longitudinally rugulose and with large, scattered punctures. Thorax, 

 petiole and postpetiole densely punctate, the meso- and metapleura' 

 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 Coll. 



Leptothorax fii/stt'iciilus, 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. Antennrp 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 <\. I'hysik.-ukonoin. Oespllschuft. .Tabr);anK I<V. O 



