The Ants of the Baltic Amber. 135 



behind than in front, with straight posterior border and less convex 

 sides. Ocelli present, minute. Antennal scapes reaching further beyond 

 the posterior corners of the head. Mandibles 8 -toothed. Pronotum 

 and epinotum less convex, mesoepinotal constriction somewhat less 

 pronounced. Sculpture and pilosity as in the worker major but color 

 more often pale brown or yellowish. 



Described from 33 specimens, distributed as follows: 9 major 

 and 17 minor workers in the Geolog. Inst. Koenigsberg Coll. (XB 948, 

 XXB 121, 112] 6/834, XXB 1085, B 18 826, XXB 778, B 19 212, 

 B 18995, XXB 485, XXB 867, XXB 7177, B 19479, B 19712, 

 14374/1015, XXB 1022, B 19 742 and 10 without numbers); 4 major 

 and 2 minor workers in the Klebs Coll. (K 6405, K 5619, K 1047, 

 « 130, a 175, a 72) and one major worker in the Haren Coll. (976). 



Among the specimens included under the description of the worker 

 minor, the head varies in size, so that the worker of this species is 

 really polymorphic and not dimorphic. The small eyes and pale color 

 would seem to indicate that it was nocturnal or crepuscular. It is 

 very easily recognized among the amber Cam})onotin(B by its small 

 eyes, peculiar pilosity and the shape of the thorax and petiole. I refer 

 it to the genus Pseudolasius though in the structure of the thorax 

 and the position of the eyes it differs greatly from the only species 

 of this genus known to me, namely Ps. binghami Emery of India. One 

 of the recent species, however, Ps. mayri Emery of Java, Sumatra and 

 Borneo, has a deeply constricted thorax like Ps. boreus, judging from 

 Emery's description, but the apical mandibular border is very oblique. 

 The eyes, which have only about 5 facets and must therefore be even 

 more poorly developed than those of boreus, are placed a little in 

 front of the middle of the head. In other respects the two species 

 must be rather similar. It is apparent from Emery's recent revision 

 of Pseudolasius (Mem. Soc. Ent. Belg. LV, 1911, p. 219) that none of 

 the 13 species which he enumerates is at all satisfactorily known. 

 Of this number 12 are peculiar to the Indomalayan Region and only 

 one to Africa. The occurrence of a species in the Baltic amber shows 

 that the genus had a much wider distribution during early Tertiary times. 



Tribe Camponotini Forel. 



Genus Drymoniyrtnex, gen. nov. 



Female. Allied to Aphomomyrmex Emery. Body rather long 



and narrow. Head subrectangular, decidedly longer than broad, as 



broad in front as behind, with straight sides and posterior border, 



with the moderately large, flattened eyes at the middle of its sides. 



