QQ William Morton Wheeler 



but little broader than the petiole and slightly broader than long. 

 Gaster elliptical, its basal border not straight and transverse. Legs 

 rather slender. 



Head, thorax, petiole and postpetiole densely punctate, and the 

 head and thorax also coarsely reticulate-rugose. 



Erect hairs on body long, thick, blunt and clavate, much more 

 conspicuous than in any of the other amber species of Leptothorax; 

 hairs on the scapes and legs short, appressed and pointed. 



Color red, surface more or less enveloped in a golden air film. 



Described from a single specimen (X B 1270) in the Geolog. 

 Inst. Koenigsberg Coll. This species is easily recognized by its peculiar 

 sculpture, long, stout epinotal spines and coarse, clavate hairs. 



Leptothorax placivus, sp. no v. 

 Worker. Length about 3,5 mm. 

 Head and eyes rather large. Antennae 11-jointed; first funicular 

 joint as long as the two succeeding joints together; joints 2 — 9 

 distinctly longer than broad ; terminal joint of club as long as the two 

 preceding joints together. Thorax rather robust, with very distinct 

 mesoepinotal constriction, on both the dorsal and pleural surfaces. 

 Epinotum with two very blunt teeth or angles instead of spines, the 

 base convex and a little longer than the concave, sloping declivity. 

 Petiole about l^/g times as long as broad, its node rather sharply 

 angular in profile, with straight anterior and posterior slopes; its 

 border straight and transverse. Postpetiole broader than long, broader 

 than the petiole, very convex and rounded above. Gaster somewhat 

 flattened above, convex below. Femora and tibiae incrassated. 



Mandibles striatopunctate ; head finely reticulate and smooth, 

 except the cheeks, which are coarsely longitudinally reticulate-rugose 

 and the clypeus, which is finely and longitudinally rugulose. Thorax 

 coarsely punctate, the pleurae and epinotum also coarsely longitudinally 

 rugose, the pronotum with feebler and more numerous rugae. Petiole 

 and postpetiole finely rugulose-punctate. Gaster and legs smooth and 

 shining, with small, scattered, piligerous punctures. 



Hairs very sparse, distinct only on the petiole, postpetiole and 

 gaster, where they are moderately long and blunt, on the petiole and 

 postpetiole also slightly clavate; on the scapes and legs the hairs are 

 very fine and appressed. 



Color blackish, legs and antennae red in transmitted light. 



Described from a single, beautifully preserved specimen (without 

 a number) in the Geolog. Inst. Koenigsberg Coll. This species is easily 



