116 HYMENOPTERA 



obsolete in the workers, some species of the large workers furnished 

 with a single ocellus ; the petiole of the abdomen formed of two nodes ; 

 females and workers with a sting. The colonies of the different 

 genera and species consisting of males, females, large and small 

 workers ; the large workers with enormously-enlarged heads, those of 

 the small workers of the ordinary size, 



Genus-ATTA. 



St. Farg. 



Maxillary palpi four-jointed ; labial palpi three-jointed ; antennae 

 twelve- jointed in the female and worker, thirteen- jointed in the male. 

 Wings longer than the body, with one marginal and three submarginal 

 cells, the third sometimes incomplete; the second submarginal cell 

 bell-shaped, the nervure at its apex uniting with that at the base of 

 the marginal cell. Abdomen with two nodes in the petiole. The large 

 workers usually with enormously-developed heads; the small workers 

 with heads of the ordinary size. 



A. ANTARCTICA. Smith, Cat. Hymen. Brit. Mus., Pt. VI., p. 167 



(1858). 



Female. Ferruginous. Head narrower than the thorax ; the 

 antennffi dark fusco-ferruginons, with the basal joints of the flagellum 

 and the apex of the scape ferruginous. Thorax : a black stripe on 

 each side of the disc of the mesothorax, and an abbreviated central 

 one in front ; the sutures of the scutellum, post-scutellum, and a 

 patch on each side of the pectus, black : the legs more or less nigro- 

 piceous, with the articulations and the tarsi pale. The abdomen with 

 a black fascia on the apical margins of all the segments. 



Length, 34 lines. 



Stjb-Ordeh— PUPIVOEA. 



Abdomen petiolated ; in the female armed with a borer. Tro- 

 chanter bi-annulate. Larva without feet. The females deposit their 

 eggs in the larvse or pupse of other insects. 



Abdomen attached to the metanotum. Evaniidce. 



Abdomen attached to the end of the metathorax. 



a. Veins of the wings well marked. 



Pirst subcostal united to median cell. Ichneumonida . 

 First subcostal separated from median cell. Braconida. 



b. Veins of wings nearly obsolete. Proctotrupidce, 



