Trygonalys pictifrons

Smith, F., 1860, Descriptions of new species of hymenopterous insects collected by Mr. A. R. Wallace at Celebes. (Part Formicidae), Journal of the Proceedings of the Linnean Society of London, Zoology 5, pp. 57-93 : 67-68

1. Trygonalys pictifrons .

T. nitidus, niger, distincte punctatus : capite pedibusque albo maculatis ; alis hyalinis, apice fuscis.

Female. Length 5 lines. Black ; head and thorax with coarse, shallow, confluent punctures ; the mesothorax with two oblique longitudinal impressed lines, which enclose, in the middle, one-third of the disk, the lateral portions being irregularly striated longitudinally ; the scutellura with a central depression, the metathorax rounded. The face with an ovate spot outside the insertion of the antennæ, two at the base of the clypeus, and an oblong one at the inner margin of the mandibles, white ; the head a little wider than the thorax. Thorax : the tubercles, the anterior tibiæ in front, and the intermediate and posterior pairs at their base, white ; wings hyaline and iridescent, with a dark fuscous cloud at the apex, commencing at the stigma. Abdomen shining, more finely punctured than the head and thorax, the base with a central longitudinal depression ; beneath, more delicately and not quite so closely punctured.

Male. Length 33/4 lines. Closely resembles the female, but rather more finely punctured ; the extreme base of the femora and apex of the trochanters are pale, there is also a pale spot on each side of the scuttellum and of the postscutellum ; the second segment of the abdomen

acutely angular in the middle, but produced iato a distinct acute tooth.