The Ants of the Baltic Amber. 
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- 
tennse 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 antennse 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. constridus, Ern. Andre 3. 
I have seen 57 specimens, distribnted as follows: 51 in the Geolog. 
Inst. Koenigsberg Coli. (XXB 1794, B 5058, B 18936, B 18 300, B 19 936, 
B 19051, XB 670, XXB 1342, XXB 981, XXB 1027, XXB 1303 etc.), 
3 in the Klebs Coli. (K 4049, K 3717, K 1730), one in the Berlin 
Museum (283) and two in the Wi. Haren Coli. (862 and 2168). In 
addition to these I have also examined the four types of Mayr in the 
Geolog. Inst. Koenigsberg Coli. (7650/309 (ergatomorphic male), 
Fig. 42. Iridomyrmex constrictus Mayr. 
Ergatomorphic male. Type, 7595/309. 
