Art. 8. BRACONID AND CHALCID FLIES FROM FORMOSA GAHAN 5 



anteriorly; antennae inserted on middle of head and not distinctly 

 above middle of eyes, 11- jointed, approximately two-thirds as long 

 as the body, scape barely longer than broad, pedicel globose, flagellar 

 joints about two and one-half times as long as thick, except the 

 last, which is about equal to the two preceding joints together; 

 pronotum normal, without a conspicuous elevated area medially and 

 without toothlike projections laterally, but usually with a very 

 inconspicuous fovea or weak longitudinal fold on each side near 

 the middle; notauli weakly impressed at the lateral anterior angles 

 of the mesonotum. entirely effaced on the dorsum; propodeum com- 

 pletely but ver}^ delicately areolated and its posterior face very 

 faintly rugulose; abdomen about one and one-third times the length 

 of head and thorax, smooth, the first tergite rather narrow with a 

 slight constriction between middle and apex, the spiracles at the 

 middle and not prominent; anal prongs distinctly longer than the 

 first tergite; ovipositor sheaths approximately half as long as the 

 anal prongs, very nearly as broad at apex as at base, and only 

 slightly curved; wings normal, the radius extending a little more 

 than halfway to tlie wing margin; first brachial cell mostly effaced. 

 Head and thorax black; scape, pedicel, two or three basal joints 

 of flagellum, and the mouth pale yellowish; collar and propodeum 

 usually somewhat piceous; legs f usco-testaceous ; first segment of 

 abdomen pale, remainder of abdomen, including the anal prongs and 

 ovipositor sheath, brownish black ; wings hyaline, stigma and radius 

 pale; basal vein dark. 



Male. — Length 1.1 mm. Antennae 13-jointed; legs usually a little 

 more strongly infuscated than in the female. Otherwise agrees with 

 female. 



Type locality. — Taihoku, Formosa. 



Type.—C2iL^o. 28987, U.S.N.M. 



Host. — Aphis gossypii Glover. 



Two females and four males received from T. Shiraki. reared 

 August 30, 1922, by R. Takahashi. 



TRIOXYS STRUMA, new species 



This species may be distinguished at once from all others known 

 to the writer by the presence on the middle of the pronotum or collar 

 of an elevated area which is broader than long and nearly flat above, 

 with its lateral anterior angles prominent, in lateral view appearing 

 as a blunt tooth on each side of the pronotum. 



Female. — Length 2.6 mm. Smooth and polished. Head, viewed 

 from above, transverse; viewed from in front slightly broader than 

 high, the vertex strongly arched above the eyes; eyes slightly con- 

 verging below; antennae inserted about on middle of head but 



