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 inclined forward, much com- 
pressed anteroposteriorly and with a sharp 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, coxse, 
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 Coli (B 5390, XXB 508, IIB 273, XXB 536, XXB 451, B 19396, 
B 5311, B 18679, XXB 429, XXB 1074, B 18802, B 19143, B 18652, 
B 18735, XXB 7173, XXB414, XXB564, B 5404, XXB 1099, B 19009, 
XXB 1910, B 19994, B5067, XXB 1421, B5482, B 18290, XXB 1112, 
B 18196, B 19223, B 18607, B 19503, XXB 271 etc.) and 9 in the 
Klebs Coli. (K 3704, K 4310, K 1731, K 3694, K 1045, « 87, « 134, 
«51, « 28). Many of these are in an excelient 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. 
I. samlandicus is most nearly related to I . constrictus and 
I. 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 
