108 
William Morton Wheeelr 
ing, the long ones acute. Antennse short, 8-jointed, the scapes not 
reaching to the posterior orbits, incrassated at their tips ; joints 1 and 2 
of the funiculi more than twice as long as broad, joints 3 — 6 longer 
than broad. Thorax shaped much as in Dimorphomyrmex theryi ; pro- 
and mesonotum rather flat above, the latter compressed laterally, longer 
than broad, narower behind than in front and impressed, but without 
a suture, at its juncture with the metanotum. Epinotum with subequal 
base and declivity, the former rather convex, the latter feebly concave. 
Petiolar node shaped like that of D. mayri, rather high, compressed 
anteroposteriorly, more than twice as broad as long, with blunt, rounded 
border and flat anterior and posterior surfaees. Gaster and legs as 
in the two species of Dimorphomyrmex ; middle and hind tibse with 
very short, simple spurs. 
Sculpture and pilosity as in the two species of Dimorphomyrmex, 
except that the longitudinal striation between the eyes is shorter and 
confined to the front. 
Color yellow, red or blackish brown, according to the state of 
preservation. 
Described from 23 specimens in the Geolog. Inst. Koenigsberg 
Coli. (XXB 1501 type, B 18734, XXB 561, XXB 1083, XXB 548, 
XXB 682, B 19222, XXB 1554, B 19988, B 19942, B 18429, B 5200, 
B 18539, XXB 1501, XXB 2048 and 9 without numbers). No. 168/21 
of the same collection was mentioned by Mayr as belonging to 
G. hoernesi but it is really a specimen of G. annectens . One of the 
specimens is in the same block with a worker of Iridomyrmex goepperti. 
Owing to the close resemblance of G. annectens to the preceding 
species of Dimorphomyrmex I was at first inclined to include it in 
that genus, but as its resemblance is greater, especially in the shape 
of the head, to Gesomyrmex hoernesi , it seemed best to place it with 
this species. I have also been led to adopt this course by a con- 
sideration of the only known living species, G. chaperi, which was 
described by Ern. Andre from Borneo many years after the genus 
had been founded by Mayr for the amber species, since this recent 
species is intermediate, so far as can be infered from Andrer figures, 
between G. hoernesi and annectens and certainly resembles the latter 
more closely in the greater width of the anterior border of the head 
and the greater development of the cheeks. 
Gesomyrmex hoernesi Mayr. (Fig. 53.) 
Gesomyrmex Hörnesi Mayr, Beitr. Naturk. Preuss. I, 1868, p. 52, Tat. II, Fig. 88 
bis 41, $cT* 
