The Ants of the Baltic Amber. 



87 



Fig. 40. Iridomyrmex geinitzi Mayr. Worlfer, B 18464. 



This species is not a Bothriomyrmex but a typical Iridomyrmex 

 very closely resembling in the form of the body certain Australian 

 species, notably /. rufoniger Lowne, as Mayr observed. It has well- 

 developed 6 -jointed .^■fe--/ 

 maxillary and 4-jointed ^^^ zi. ^ mrr^ ^ 

 labial palpi and the 

 anterior clypeal border 

 is sinuately excised in 

 the middle whereas 

 in Bothriomyrmex the 

 maxillary palpi are 4- or 

 2-jointed, the labial 3- 

 or 2-jointed and the 

 clypeal border is entire. 



Mayr's descrip- 

 tion and figures enable 



one to recognize all three phases of I. geinitzi without difficulty. 

 This ant is one of the most abundant in the Baltic amber and there- 

 fore rarely lacking even in small collections. Mayr examined 1G8 speci- 

 mens, Ern. Andre 80, I have 

 seen in all 1041 specimens, which 

 are distributed as follows: 796 

 workers, 3 females and 6 males 

 in the Geolog. Inst. Koenigsberg 

 Coll. (B 19204, XXB 395, XXB 

 6640, B 27542, B 550, B 7175, 

 B 11754, XXB 56, XXB 388, 

 B 18447, B 18985, B 5256, etc.) 

 and 12 larvae and pup^e, in all 

 probability belonging to this spe- 

 cies (B 18364, B 18125, B 18313 

 and several without numbers); 

 199 workers, one female and 5 

 males in the Klebs Coll. (K 2635, 

 K 5591, a 91, a 117, K 5622, 

 K 6407, K 1038, K 4516, K 1086, 

 K 1743, etc.), one worker in the Brussels Museum, 15 workers 

 in the Berlin Museum (242, 276, 281, 303, 312, 304, 307, 295) 

 and 13 workers in the Wm. Haren Coll. (265, 1438, 1665, 1692, 

 1650, 2433, etc.) In addition to these, and not included in the 

 number 1041 recorded above, I have found in the Geolog. 



,-^rf 



d. 



Fig. 41. Iridomyrmex geinitzi Mayr. 

 a) larva; bj two pupae, B 19874. 



