The Ants of the Baltic Amber. 63 



long, transversely elliptical. Gaster distinctly larger than the head. 

 Legs rather long, femora a: d tibiae distinctly incrassated and clavate. 

 the middle and hind tibice without spurs. 



Mandibles and middle of clypeus apparently smooth; sides of 

 clypeus indistinctly rugiilose. Head longitudinally rugose, except in 

 the occipital region where the rug^e are more reticulate. Pro- and 

 mesonotum more coarsely reticulate-rugose. 

 Epinotum and sides of petiole and post- 

 petiole longitudinally and finely rugose; 

 gaster, legs and summits of nodes smooth. 



Hairs on the body coarse, erect, mo- 

 derately abundant, most conspicuous on the 

 gaster; very short and appressed on the legs 

 and antennal scapes. 



Color varying, according to the state 

 of preservation, from golden brown to black. 



Described from seven specimens in the 

 Geolog. Inst. Koenigsberg Coll., namely: ^^athornyrmicapHiolatamYii. 

 No. 237/7523 (Mayr's type), 819/10925, Worker. B1276. 



B 242, B 255, XXB 5177, XXB 127(3 and 



one without a number. Mayr saw only two specimens of this species, 

 neither of which showed the sculpture of the head and thorax. At 

 first sight the specimens seem to be referable to Leptothorax or Pheidole. 

 The species is readily distinguishable from the other members of the 

 genus Nothomijrmica by its small size, the curvature of the epinotal 

 spines and the strongly pedunculate petiole, a character which Mayr 

 has designated in the specific name. 



Genus Leptothorax Mayr. 

 Leptothorax gracilis Mayr. 



Leptothorax gracilis Mayk. Beitr. Naturk. Preuss. I, 1868, p. 89, Figs. 89—92, $ 9; 

 Dalla Torue, Catalog. Hymen. VII, 1893, p. 124; Handlirsch. Fos.*. 

 Insekt. 1908. p. 870. 



The single worker, Xo. 7655/369, in the Geolog. Inst. Koenigs- 

 berg Coll., the ergatotype of this species, is badly decomposed and 

 has apparently deteriorated since it was described by Mayr. As his 

 description is rather indefinite I add a few remarks on structure and 

 sculpture derived from the study of a large series of well-preserved 

 specimens. The epinotal spines are shorter, stouter and less curved 

 than Mayr supposed, although distinctly longer than broad at their 

 bases and much further apart than long. They are directed backward. 



