310 MEMOIES OF TEE QUEENSLAND MUSEUM. AUSTRALIAN HYMENOPTERA CHALCIDOIDEA— XIII.* The Family Agaonidae with Descriptions of Four New Genera, Six New Species r and One New Variety. By A. A. Girault. Family AGAONIDtE. Subfamily AQAONIN^E. Genus BLASTOPHAGA Gravenhorst. 1. BLASTOPHAGA INSULARIS new species. Female. Length, 1.40 mm., exclusive of ovipositor. This species runs to I dames Walker of the Idarnina? but the scutellum without grooved lines, subquadrate and flat but the lateral margins carinated, concave and the others concave to some extent; axilla? very widely separated. Parapsidal furrows complete, narrow. Post-marginal vein about the length of the long and slender stigmal which runs nearly directly caudad. Exserted part of the ovipositor a little longer than the abdomen. Mandibles bidentate; antenna? 11 -jointed, without a ring-joint, the third joint prolonged into a submem-braneous sheath, acute at tip, which surrounds the second funicle joint which is shortest yet longer than wide and subecjual to the first which appears to be membraneous. Scape dilated, beneath with a tubercle-like tooth at proximal third. Joints of antennae beyond the second with numerous, flattened glume-like seta? which project beyond the apex of each. Fore and hind legs swollen. Head quadrate. Middle club joint shortest, much wider than long, club 3 longest^ somewhat longer than wide, with a minute terminal nipple. Brown, the wings hyaline, the legs concolorous except the tarsi which are yellow; funicle and club black, the scape (also pedicel) yellowish brown. Fore and hind tibia? very short, much shorter than their femora or tarsi. Habitat: Thursday Island, Torres Strait, Queensland. Forest, March 12, 1912. Type: No. Hy 3861, Queensland Museum, Brisbane, the female on a slide. Genus PLEISTODONTES Saunders. This genus is characterised by the very long head which is two and a half times longer than wide. Head oblong, or very long, from two and a half to three times as long as wide r the facial channel narrow; mandibles at apex bidentate; antenna? 11-jointed; the first funicle joint with a distinct process; marginal, stigmal and postmarginal veins fully developed. In the male the thorax is trape2oidal in outline; the antenna? 6-jointed with three ring-joints; the cephalic tarsi 5-jointed. Body somewhat narrow. The cephalic tarsus not reposing in a sulcus at the tip of the front tibia. Basal part of antenna? not enclosed in a canal. * Contribution No. 36, Entomological Laboratory, Bureau of Sugar Experiment Stations,. Bundaberg, Queensland.