40 
William Morton Wheeler 
ein erhebliches Merkmal anzugeben, wodurch beide Arten von einander 
zu trennen wären, obschon ich andererseits nicht behaupten möchte, 
daß beide gar nicht von einander ab weichen a Comparison of the 
work er atavia with that of coarctata shows that the latter has a longer 
head, with the eyes placed further back and the antennge with much 
shorter basal funicuiar joints; the mesonotum is of a different shape, 
the epinotum shorter and the sides of its base are not marginate. 
In certain particulars, especially in the structure of the thorax and 
antennse, the amber Ponera resembles much more closely P. confinis 
Roger of India, Burma and Sumatra and P. eduardi Forel of the 
Mediterranean region. Mayr called attention to the fact that the male 
of P. atavia is unlike that of P. coarctata in possessing MAYRian furrows 
on the mesonotum. 
In addition to the worker specimen described above 1 have 
examined the following females in the Geolog. Inst. Koenigsberg Coli.: 
No. 203/3855 (Mayr’s type), 103/14, B 18 331, and three specimens 
without numbers; the following males: 621/10108 (Mayr’s type), B 4502, 
B 18442, XXB48, B 18460, XXB 2139, B 19815, XXB 1598, 
[]B 247, and nine specimens without numbers, and five males in the 
Klebs Coli.: K 3537, K 5252, K 5238, K 7530 and K 5173, the last 
comprising two specimens in the same block of amber. Thus I have 
seen twenty-nine specimens of this species, including the worker. The 
female specimen B 18 331 is embedded with a small worker of Lasius 
schiefferdeckeri Mayr. 
Ponerlnce incertae sedis. 
Ponera graciticornis Mayr. 
Mayr, Beitr. Naturk. Preuss. I, 1868, p. 72, nota, Dalla Torre, Catalog. 
Hymen. VII, 1893, p. 39; Handlirsch, Foss. Insekt. 1908, p. 879. 
Mayr’s description of this species based on a single worker 
specimen from the Menge Coli., is too brief to admit of the deter- 
mination of the genus to which it belongs. That it is not a Ponera 
is show by its great size (10,5 mm). I am unable to recognize it among 
the material sent me by Professors Klebs and Tornquist. 
Subfamily Myrmicince Mayr. 
Tribe Pseudomyrmini Emery 
Genus Sima Roger. 
The occurrence of five species of this genus in the Baltic amber 
is of unusual interest, as all the living members of the genus are 
