The Ants of the Baltic Amber. 93 



spiracles situated at the angles on the sides. The sides of the epi- 

 notum are flattened so that the base when seen from above is subob- 

 long, a little broader behind than in front. Petiole very short and 

 rather broad, its node high, scarcely inchned forward, much com- 

 pressed anteroposteriorly and with a sliarp upper border, which is 

 rounded, though not broadly so, when seen from behind. Gaster 

 large, scarcely over-hanging the petiole with its base. 



Shining; head and thorax finely punctate or coarsely shagreened; 

 gaster, legs and scapes more delicately shagreened. Mandibles very 

 coarsely punctate, clypeus delicately and longitudinally striated on 

 the sides; posterior portions of epinotal declivity transversely rugose. 



Pilosity feebly developed ; erect hairs lacking on the upper sur- 

 face of the body, including the gaster, sparse on the venter, coxae, 

 mandibles and clypeus; appendages, except the tips of the scapes and 

 femora, without erect hairs, apparently covered with very short, de- 

 licate pubescence. 



Actual color black; in some specimens with reddish legs or 

 antennae. 



Described from 82 specimens; 73 in the Geolog. Inst. Koenigs- 

 berg Coll (B 5390, XXB 508, IIB 273, XXB 536, XXB451, B 19396, 

 B5311, B 18679, XXB 429, XXB 1074, B 18802, B 19143, B 18652, 

 B18735, XXB7173, XXB414, XXB564, B 5404, XXB 1099, B 19009, 

 XXB 1910, B 19994, B5067, XXB 1421, B 5482, B 18290, XXB 1112, 

 B 18196, B 19223, B 18607, B 19503, XXB 271 etc.) and 9 in the 

 Klebs Coll. (K 3704, K 4310, K 1731, K 3694, K 1045, a 87, « 134, 

 « 51, a 28). Many of these are in an excellent state of preservation 

 though frequently covered with delicate silvery air-films. The block 

 XXB 508 contains also an aphid; block XX B 273 contains a worker 

 of 1. geinitzi with three workers of I. samlandicus and block XXB 1910 

 contains 4 specimens of the latter species. 



/. samlandicus is most nearly related to I. con strict us and 

 /. geinitzi but is easily distinguished from both by the structure of 

 the thorax and petiole. 



Iridomyrmex oblongiceps sp. nov. 



Worker (Fig. 45). Length nearly 5 mm. 



Head, excluding the mandibles, a little longer than broad, sub- 

 rectangular, with straight parallel sides and broadly excised posterior 

 border. Gula concave in the middle, upper surface of head rather 

 flat. Eyes large, convex, in front of the middle of its sides. Man- 

 dibles and clypeus in an unfavorable position for study. Labial palpi 



