The Ants of the Baltic Amber. 



51 



Tribe Myrmicini Emery. 



Genus VoUenliovia Mayr. 



Vollenhovia heyrichi (Mayr). 



Macromischa beyrichi Mayk, Beitr. Naturk. Preuss. I, J868, p. 84, Figs. 80, 81 $; 

 Propodonn/nna samlandica Wheeler, Ants, Their Structure etc. 1910, p. 163. Fig. <i3 $. 



Worker (Fig. 17). Length 4 mm. 

 Head, excluding the mandibles, but little longer than broad, 

 subrectangular, with straight posterior border and rather straight sides. 

 Eyes moderately large, somewhat flattened, near the middle of the 

 sides. Mandibles 5-toothed; the two apical _ 



teeth largest; basal tooth prominent. Cly- <^\, 



peus short and broad, convex in the middle, 

 depressed on the sides, its anterior border 

 with a faint but distinct median sinuosity. 

 Antennal fovete large. Frontal area small, 

 triangular. Frontal carina- short. Antennae 

 rather stout, 12-jointed; scapes not reaching 

 to the posterior corners of the head; funi- 

 culus terminating in a 3-jointed club which 

 is distinctly shorter than the remainder of 

 the funiculus; first funicular joint as long 

 as the two succeeding joints together; joints 

 2 — 7 broader than long, joint <S as long as 

 broad, terminal joint as long as the two pre- 

 ceding subequal joints of the club. Thorax 



stout, somewhat narrower behmd than in front; pronotum with 

 prominent transverse anterior portion rising abruptly above the neck ; 

 humeri prominent though rounded. Mesoepinotal constriction faint, 

 especially on the dorsal side, so that the surface of the mesonotum 

 and base of the epinotum in profile form a nearly continuous hori- 

 zontal line. Epinotum armed with two teeth which are longer than 

 liroad at their bases, as long as far apart, somewhat bkinted at their tips 

 and directed backward and slightly outward and upward. Epinotal base 

 and declivity subequal, meeting at nearly a right angle, ll.e declivity 

 concave, the metasternal angle rounded. Petiole from above twice as 

 long as broad, with subparallel sides, a little narrower in front than 

 behind, in profile with a short peduncle and a prominent anteromedian 

 ventral tooth; node rather high and angular, with subequal anterior 

 and posterior slopes, the former concave, the latter convex above and 

 concave near the border of the postpetiole. Postpetiole a little broader 



4* 



Fig. 17. 

 Mayr. 



Volle^^hovia beyrichi 

 Worker, K 904. 



