The Ants of the Baltic Amber. 
125 
addition to 49 of the 53 specimens studied by Mayr in the Geolog. 
Inst. Koenigsberg Coli, including the single gynetype and two andro- 
types, I have examined 1022 specimens. These are distribnted as 
follows: 731 workers, 2 females and 68 males in the Geolog. Inst. 
Koenigsberg Coli. (B 1898, B 19090, B 19425, B 19067, B 18779, 
B 19730, B 19194, B 18584, B 16592, B 18681, B 18834, XXB 1416, 
B 19026, B 14153, B 18737, B 18188, B 18335, B 5069 etc.), 118 
workers and 18 males in the Klebs Coli. (K 4778, K 1690, K 4770, 
K 4459, a 73, a 110, K 4774, K 1052, a 107, K 875, a 135, K 4060, 
K 1056, K 768, a 4, a 49, K 1677, K 1062, K 5179 etc.); 39 workers 
and one male in the Berlin Museum (306, 280, 302, 301, 299, 297, 
292, 291, 298, 290 etc.) 6 workers in the Brussels Museum (205, 207, 
210, 226 and 2 without numbers) and 30 workers in the Haren Coli. 
(26, 220, 253, 373, 857, 855, 589, 442, 863, 927, 979, 983 etc.). There 
are also two worker cocoons (IIB 313 and B 5157) containing pupse 
of this ant in the Geolog. Inst. Koenigsberg Coli. 
Formica horrida, sp. nov. 
Worker (Fig. 59). Length 3,5 — 4,5 mm. 
Allied to F. cinerea Mayr. Head a little longer than broad, 
narrower in front than behind, with rounded sides and posterior Cor- 
ners and straight posterior border. Eyes large, moderately convex, 
Clypeus sharply carinate, its anterior border angulary projecting in 
the middle. Antennal scapes straight, not curved even at the base, 
of nearly uniform thickness except at their insertions, and extending 
about 1 / 3 their length beyond the posterior Corners of the head; funi- 
cular joints 2 — 10 subequal in length but the more distal joints broader. 
Thorax shaped much as 
cinerea . Petiole rather 
narrow, the node somewhat 
broader above than below, 
with straight sides and 
broadly rounded, rather 
sharp superior border. 
Body shining, finely 
shagreened and super- 
ficially punctate. 
Hairs erect, long, 
stiff, coarse and abundant, covering the body, legs and antennal scapes; 
longest on the gaster; on the funiculi very short and oblique. Pubes- 
cence on body very short and dilute. 
Fig. 59. Formica horrida sp. nov. Worker. 
