The Ants of the Baltic Araber. 



89 



thorax and gaster is like that of the worker, though the base of the 

 epinotum is less convex and less abruptly elevated, so that the angle 

 between it and the declivity is less pronounced in profile. Mayr does 

 not mention that the eyes are decidedly larger and more convex than 

 in the worker. There are a few small white spots or bubbles on the 

 vertex which resemble 

 small ocelli, but these 

 organs seem to be ac- 

 tually absent. The an- 

 tennae are 13-jointed and 

 very long; the scapes, 

 however, are like those of 

 the worker but extend 

 well beyond the posterior 

 borders of the head 

 whereas joints 2 — 11 of 

 the funiculi are cylindri- 

 cal, subequal and fully 

 3 times as long as broad, 

 the terminal joint being 

 somewhat longer than 

 these, the first shorter. 

 In the gaster, which is 

 shaped as in the worker, 



there are 5 indistinctly visible segments, and the tip shows 

 clearly the small hairy, external genital valves (stipites) of the 

 male. The legs are also longer and more slender than in the 

 worker. The shape of the head and antennae in this speci- 

 men shows that it is an ergatomorphic male of the extreme type such 

 as is found in Formicoxenus nitidulus and Ponera pundatissima. This 

 is interesting as demonstrating that a type of male, which we should 

 naturally regard as a very modern development, had already made its 

 appearance in the early Tertiary. 



Mayr examined 10 specimens of I. constrictus, Ern. Andre 3. 

 I have seen 57 specimens, distributed as follows: 51 in the Geolog. 

 Inst. Koenigsberg Coll. (XXB 1794, B 5058, B 18936, B 18300, B 19936, 

 B 19051, XB 670, XXB 1342, XXB 981, XXB 1027, XXB 1303 etc.), 

 3 in the Klebs Coll. (K 4049, K 3717, K 1730), one in the Berlin 

 Museum (283) and two in the Wm. Haren Coll. (862 and 2168). In 

 addition to these I have also examined the four types of Mayr in the 

 Geolog. Inst. Koenigsberg Coll. (7650/309 (ergatomorphic male), 



Fig. 42. Iridomyrmex constrictus ^Iayr. 

 Ergatomorphic male. Type, 7595/309. 



