7(5 WiLiJAM Morton Whi-:em:r 



Head evenly rounded posteriorly, semi -circular behind the eyes. 

 Antennae extending back only to the base of the second gastric seg- 

 ment. Thorax through the mesonotum scarcely broader than the 

 head through the eyes. Petiole longer than broad and longer than 

 high through the node, which is at the posterior end of the segment, 

 rounded above, with long, slightly concave anterior slope and short, 

 straight, vertical posterior declivity, Gaster longer than the thorax, 

 narrow, with parallel sides, slightly broader at the tip than at the 

 base. Stipites of genitalia small, narrow and pointed; volsellae short, 

 robust and blunt at their tips. Hypopygium with the posterior border 

 pointed in the middle, feebly and sinuately excised on each side. 



Sculpture, pilosity and color as in the worker. Wings hyaline 

 with pale veins and stigma. 



Described from 24 specimens: 17 in the Geolog. Inst. Koenigs- 

 berg Coll. (B 18 827, B 18 551, B 5266, XXB 1484, B 19845, B 5177, 

 B 5400, XXB 1475, B 797 and 8 without numbers), 4 in the Klebs 

 Coll. (K 4036, K 4170, a 132, K 6415, two in the collection of Mr. 

 Wm. Haren (1349 and 2435) and one (274) in the Berhn Museum. 



This ant is readily distinguished in the worker phase from all 

 the other amber species by its singular, constricted thorax and in- 

 flated, egg-shaped epinotum. Its slender habitus recalls somewhat 

 that of the Australian Leptomyrmex, but it has no close affinity with 

 this strange genus. 



Of the two male specimens which I refer to F. tornqnisti, one 

 the androtype (B 797) is very clear, the other (without a number) is 

 opaque, with a white coating, and the wings seem to be of a darker 

 color, but I am unable to detect any other differences of importance. 

 I believe that I am not mistaken in referring these males to P. toni- 

 quisti. They closely resemble the males of the Ponerinse, but this 

 would be expected from the affinities of the worker. There is, ho- 

 wever, no trace of a constriction between the first and second gastric 

 segments, nor of the cerci as in most Ponerine males, and the man- 

 dibles are well developed, whereas these appendages are imperfectly 

 developed and the cerci are well- developed in the Ponerin?e of the 

 section Euponerinae that lack the gastric constriction. 



The occurrence of the two genera Protaneuretus and Paraneii- 

 retus in the Baltic amber is of considerable interest on account of 

 their close relationship to the recent genus Aneuretus, which is re- 

 garded as a kind of connecting link between the subfamilies Ponerinre 

 and Dolichoderince. The amber species are in certain respects even 

 more primitive and generalized and are of larger size than the single 



