The Ants of the Baltic Amber. 57 



about as long as broad, moderately convex, with nearly straight, 

 entire anterior border. Frontal area large and distinct, triangular. 

 Frontal carinas short, each continued back into the mesial border of 

 one of the antennal scrobes. Antenna? long and robust, 12-jointpd, 

 with a 3-jointed club; first funicular joint nearly as long as broad, 

 joints 2 — 8 much broader than long, joints 9 and 10 a little broader 

 than long, terminal joint large, glandiform, as long as the two 

 preceding joints taken together. Thorax scarcely longer than the head 

 and distinctly narrower, somewhat, broader in front than behind, with 

 rounded humeri and convex, rounded pro- and mesonotum and without 

 traces of pro- and mesonotal and mesoepinotal sutures. Epinotum in 

 profile with subequal base and declivity, the former slightly flattened, 

 the latter concave, armed with a pair of short, erect teeth which are 

 about as long as br.ad at their bases and further apart than long. 

 Metasternal angles sharp and erect, forming a pair of teeth somewhat 

 smaller than those of the epinotum. Petiole and postpetiole short, 

 compact and convex above, the former about as broad as long, without 

 a distinct peduncle but with a well-developed anteromedian ventral 

 tooth, the latter nearly twice as broad as the petiole, fully twice as 

 broad as long and but little narrower than the first gastric segment, 

 which is very convex above, hemispherical, and with the terminal 

 segments forming a pointed cone, which is directed forward and 

 downward. Legs robust; middle and hind tibiae with well-developed, 

 pectinated spurs. 



Female. Resembling the worker but larger and with the typical 

 structure of the female thorax, which is very short and compact, 

 with well-developed, blunt teeth on the epinotum and compressed, 

 pointed metasternal angles. The petiole, post-petiole and gaster resemble 

 the corresponding parts of the worker. Wings with a discal and two 

 cubital cells. Genotype: Myrmica duishurgi Mayr. 



Agrwcomyrmex diusbur(fi (Mayr). 



Myrmica dvisburgi Mayu, Beitr. Naturk. Preiiss. I. 18G8, p. 87; Taf. V, Figs. 87, 88, $; 

 Dalla Torre, Catalog. Hymen. VII, 1893, p. 109; Handlirsch, Foss. 

 Insekt. 1908, p. 874. 



Worker (Fig. 22a und b). Length between 4 and 5 mm. 



Mandibles and clypeus longitudinally, antennal scrobes trans- 

 versely, and head, antennal scapes, thorax, petiole and postpetiole very 

 coarsely and reticulately rugose. The spaces between the rugic are flat 

 and apparently smooth. First gastric segment sharply longitudinally 



