4 PROCEEDINGS OF THE NATIONAL MUSEUM Vol. 70 



between the eyes; palpi normal, not elongate; antennae 16-jolnted, 

 approximately two-thirds as long as the body, the third joint (first 

 flagellar joint) nearly four times as long as thick, following joints 

 shorter, the fifteenth about twice as long as broad, the sixteenth 

 longer than the third and nearly twice as long as the fifteenth; 

 notauli effaced except at the anterior angles of mesonotum; pro- 

 podeum smooth and distinctly areolated, the petiolar area very nar- 

 row, a little broader anteriorly than posteriorly; wings normal, the 

 first abscissa of radius about twice as long as the stub of second, 

 which is subequal to the intercubitus ; brachial cell complete; abdo- 

 men one and one-half times the head and thorax in length, the first 

 tergite a little broader at apex than at base, a little more than twice 

 as long as broad at apex, and weakly rugulose; ovipositor sheaths 

 normal. General color reddish testaceous, the propodeum and second 

 and third abdominal segments suffused with brownish; legs concol- 

 orous with the thorax but with the middle and hind femora, the 

 hind tibiae, and all tarsi more or less tinged with brownish ; antennal 

 scape and pedicel testaceous, the flagellum brownish black; wings 

 hyaline, basal vein and costal vein toward apex brownish, stigma 

 and remaining veins pale; ovipositor sheaths blackish. 



Male. — Length 1.75 mm. Antennae 18-jointed, the apical joint 

 small and shorter than the preceding, the third joint the longest and 

 about three times as long as thick; face very slightly shorter than 

 the shortest distance between the eyes; head above and dorsum of 

 thorax dark brown, approaching piceous ; abdomen, except first 

 segment fuscous; hind legs mostly dark brownish. Otherwise agrees 

 with female. 



Type locality. — Taihoku, Formosa. 



Type.— C2it. No. 28985, U.S.N.M. 



Host. — Macrosiphoni^Ua formosarteniimae Takahashi. 



Four females and one male received b}'^ the Bureau of Entomology 

 from T. Shiraki and said to have been reared from the above- 

 mentioned aphid April 20, 1922, by R. Takahashi. 



TRIOXYS COMMUNIS, new species 



Easily distinguished from stigma by the absence of toothlike 

 elevations on the pronotum and by its darker color. Eesembles the 

 American species ooalis Provancher but differs by having the 

 ovipositor sheaths a little longer and the color of legs a little more 

 obscure. Also similar to aceris Halidaj^ differing chiefl}'' in the 

 darker color of thorax and abdomen. 



Female. — Length 1.2 mm. Smooth and shining. Head viewed 

 from above about twice as broad as long; viewed from in front a 

 little broader than high; vertex arched; eyes slightly converging 



