The Ants of the Baltic Amber. 



97 



rather slender, with oblique, dentate blades. Maxillary palpi 4-jointed, 

 labial palpi 3 -jointed. Thorax short and compact, broadest and highest 

 through the posterior portion of the pronotum and the anterior portion 

 of the mesonotum, which is separated from the pronotum by a distinct 

 suture and slopes back gradually to the mesoepinotal constriction which 

 is long and shallow. Metathoracic spiracles neither protuberant nor 

 approximated dorsally. Epinotum unarmed, short and rounded, without 

 distinct base and declivity. Petiole with a large, erect, transverse node. 

 Oaster large, very convex dorsally, not overhanging the petiole with 

 its base. Middle and hind tibiae without spurs; claws simple. 



Asytrtphylomyrmex balticus, sp. nov. 



Worker (Fig. 47). Length about 3 mm. 



Head as broad as long, circular, except for the posterior border 

 which is straight. Eyes rather large, moderately convex. Clypeus 

 convex in the middle, depressed at the corners, its anterior border 

 deeply and narrowly excised in the middle. Mandibles with their ex- 

 ternal borders straight at the base, convex at the tips; apical border 

 with a large terminal tooth, 

 a small tooth near the middle 

 of the border and the basal 

 portion finely denticulate. An- 

 tennte rather stout; scapes 

 reaching 2 — 3 times their dia- 

 meter beyond the posterior 

 border of the head; first funi- 

 cular joint twice as long as 

 broad, remaining joints, except 

 the last, subequal, a little 

 longer than broad. Thorax in 

 profile with the pronotum 

 convex, the mesonotum anteriorly convex and rising a little above the 

 pronotum, then flattened and sloping behind to the rather long, shallow 

 mesoepinotal constriction. Epinotum convex and rounded. Petiole higher 

 than long, robust, its node as high as the epinotum, blunt above, where it 

 is nearly as thick as it is below, a little broader than long, with convex 

 anterior and posterior surfaces. Segments of the gaster large and con- 

 vex; the tip turned under and not visible from above. Legs stout. 



Mandibles finely striated and coarsely punctate; head thorax 

 and gaster subopaque, densely and finely punctate; legs and scapes 

 •coarsely punctate. 



Schrifton d. Pliysikal.-iikonom. Gcscllscbaft. JabrKaiiK I,V. 7 



Fig. 4; 



Asyniphylomyrmex balticus, sp. iiov. 

 Worker. K 4305. 



