76 
William Mouton Wheeler 
Head evenly rounded posteriorly, semi- circular behind the eyes. 
Antennae exteuding 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; volsellse 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 Coli. (B 18 827, B 18551, B 5266, XXB 1484, B 19845, B 5177, 
B 5400, XXB 1475, B 797 and 8 without numbers), 4 in the Klebs 
Coli. (K 4036, K 4170, a 132, K 6415, two in the collection of Mr. 
Wm. Haren (1349 and 2435) and one (274) in the Berlin Museum. 
This ant is readily distinguished in the worker phase from all 
the other amber species by its singulär, constricted thorax and in- 
flated, egg-shaped epinotum. Its slender habitus recalls somewhat 
that of the Australian Leytomyrmex, but it has no close affinity with 
this stränge genus. 
Of the two male specimens which I refer to P. tornquisti, 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. torn- 
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 Ponerinse of the 
section Euponerinse that lack the gastric constriction. 
The occurrence of the two genera Protaneuretus and Paraneu- 
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 Ponerince 
and Dolichoderince. The amber species are in certain respects even 
more primitive and generalized and are of larger size than the single 
