102 HYMENOPTERA. 



vertex slightly narrowed behind the eyes ; shining and delicately 

 punctured ; the antennae inserted in front of two elevated processes, 

 the clypeus widely emarginate ; mandibles short, not toothed 

 and blunt at their apex. Thorax rugose, the disk with a mixture 

 of confluent punctures and striae ; the mesothorax with two deeply 

 impressed oblique channels running inwards and uniting at the 

 base of the scutellum ; the wings subhy aline and iridescent, the 

 iiervures testaceous, the stigma fuscous. Abdomen : the three 

 apical segments ferruginous, of the same form as in the female, 

 the node of the petiole also similar. The worker not known. 



Hab. Port Natal. 



The sexes, taken in coitu by Herr Gueinzius, have been re- 

 ceived from Port Natal ; he says, " solitary ; I have not been able 

 to find its nest." 



Genus 6. ECTATOMMA. 



Head subquadrate ; antennae inserted forwards on the face at 

 the base of the clypeus, 12 -jointed in the female, 13-jointed in 

 the male ; eyes ovate and very prominent, placed a little behind 

 the middle at the sides of the head ; maxillary palpi 2-jointed, 

 labial palpi 2-jointed ; mandibles triangular, with one or two mi- 

 nute teeth near their apex. Thorax : wings with one marginal 

 and three submarginal cells, the second submarginal cell receiving 

 the recurrent nervure near its base ; legs elongate, the spur which 

 arms the apex of the intermediate and posterior tibiae simple, 

 that at the apex of the anterior pair pectinate within. Abdomen : 

 the node of the peduncle incrassate, a deep strangulation between 

 the first and second segments. 



1. ECTATOMMA TUBERCULATA. PL VII. figs. 10-13. B.M. 



Formica tuberculata, Latr. Fourm. 210. viii. f. 46. A. $ > 46. C. J . 



OUv. EncycL Meth. vi. 498. 41. 

 Formica tridentata, Fabr. Syst. Piez. 412. 69. 



Hab. South America ; Brazil (Para; Santarem). 



Male. Length 5 lines. Fuscous or black, somewhat varying 

 in colour : the antennae as long as the insect. Head small, nar- 

 rowed behind and transversely striated behind the ocelli, in front 

 of which the striation is finer and longitudinal; the face has 

 three carinae between the antennae, the clypeus triangular and 

 strongly striated, the antennae fulvous beneath ; the mandibles 

 and legs rufo-testaceous ; the metathorax and node of the pe- 

 duncle obscurely testaceous ; the wings subhyaline, the nervures 



