HYMEN'OPTERA. 171 



Genus 2. PHYSATTA. 



Head small ; eyes of moderate size, ])laced a little above the 

 middle of the head ; ocelli in a triangle on the vertex ; mandibles 

 stout, and denticulate at the a])ex ; antenna; short, not so long 

 as the head and thorax ; the scaj)e nearly as long as the fiagel- 

 lum, slightly thickened at the apex ; flagellum subclavate, (i- 

 jomted, the first joint shorter than the second, the third, fourth 

 and fifth a))out the same length as the first, the apical joint the 

 length of the two basal ones. Maxillary palpi 3-jointed, the 

 basal and apical joints of about equal length, the intermediate 

 joint twice the length of the apical one, the latter obliquely 

 truncate at the ajiex. Labial palpi 3-jointed, the two basal 

 joints clavate, the apical one fusiform. Thorax subglobose ; 

 anterior wings with one marginal and two submarginal cells, the 

 first submarginal cell about the length of the stigma, the second 

 extending to the apex of the wing, with one subtriangular dis- 

 coidal cell ; the tibiae armed with a single spur at their apex. 

 Abdomen globose, pedunculated, the peduncle with two nodes. 



This genus in one of its most prominent characteristics agrees 

 with the genus Heptacondylus, both having seven-jointed an- 

 tenna; ; the wings, however, have a totally difi'erent neuration, 

 and this character is ])erhaps of paramount imjjortance in con- 

 structing generic divisions for the Formicidae. 



1. Physatta dromedarius. pi. X. figs. 9-11. B.M. 



Female. Length 61- lines. — The head, thorax, legs, and 

 petiole of the abdomen, ferruginous ; the mandibles with four or 

 five black teeth ; the head and thorax longitudinally striated, and 

 clothed, as well as the legs, with a thin erect fulvous pubes- 

 cence ; wings dark fuscous ; the metathorax with a stout tooth 

 on each side ; the truncation transversely striated. Abdomen 

 black ; the nodes subglobose, the first attached to the thorax by 

 a short stout petiole, and covered with erect fuscous pubescence. 



Hab. Borneo (Sarawak). 



2. Physatta crinita. B.M. 



Female. Length 5 lines. — Ferruginous : the disk of the 

 thorax obscurely so ; the abdomen deep fusco-ferruginous ; the 

 entire insect thinly covered with pale ferruginous pubescence. 

 The head coarsely rugose ; the mesothorax smooth in front, but 

 with deep longitudinal striae towards the scutellum ; the scutel- 

 lum verv prominent and roughly sculptured; the metathorax 



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