108 William Morton Wheeklr 



ing, the long ones acute. Antennae 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 Dimorphomynnex 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. uiayri, rather high, compressed 

 anteroposteriorly, more than twice as broad as long, with blunt, rounded 

 border and flat anterior and posterior surfaces. Gaster and legs as 

 in the two species of DimorpJiomyrmex] 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 

 Coll. (XXB 1501 type, B 18734, XXB 561, XXB 1083, XXB 548, 

 XXB682, 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. hoeniesi but it is really a specimen of G. annectens. One of the 

 specimens is in the same block with a worker of Iridoviyrmex goepperti. 



Owing to the close resemblance of G. annectens to the preceding 

 species of Dwiorphomyrmex 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 Jioernesi, 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 Andre's 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 Hornesi Mayr, Beilr. Naturk. Preuss. 1, 18(38, p. 52, Taf. II, Fig. 38 

 bis 41, $d^. 



