156 ENTOMOLOGICAL SOCIETY 



as long as the body; the first and second joints of the flagellum are elon 

 gate, about of an equal length, three times as long as thick; the third 

 joint is only about half the length of the second, slightly curved; the fol 

 lowing joints, except the last, are small, rounded or moniliform, and 

 loosely united, while the last joint is conical, twice as long as the preced 

 ing. 



Hab. Canobie Lake, N. H. (Bred from Hemipterous eggs.) 



FAMILY CYNIPID.*:. 



(4) Allotria ambrosiae, n. sp. 



9- Length 1.6 mm. Polished black; mandibles, first five joints of 

 antennse and the legs, pale yellowish; pronotum, scutellum towards apex 

 and metapleura rather densely pubescent; the basal scutellar furrow 

 slightly separated into two parts by a very delicate median carina; meta- 

 thorax very short, with about six elevated lines. Abdomen with a pubes 

 cent ridge on each side at base. Flagellum with joints i and 2 subequal, 

 not longer than the scape, the third joint stouter than the two preceding 

 and somewhat longer, the following three or four joints subequal. 



Hab. Cambridge, Mass. (Bred from an Aphis on Ambrosia.) 



FAMILY CHALCIDID/E. 



(7) Encyrtus thyreodontis, n. sp. 



9- Length 1.6 to i.S mm. Head bluish; thorax above aeneous black, 

 at the sides and beneath, blue-black; abdomen and legs black; sutures of 

 the trochanters, knees, tips of all tibias and tarsi, except the last joint, 

 honey-yellow; antennae black; wings hyaline, the marginal and stigmal 

 veins brown, the latter scarcely longer than the marginal, the post- 

 marginal vein short; mandibles reddish, tridentate. 



Head with the frons and vertex microscopically shagreened, opaque ; eyes 

 large, oval, the frontal space rather narrow, about half the width of the eye, 

 the lateral ocelli close to the eye margin, the frontocellus farther away from 

 the lateral ocelli than these last are to each other. Antennae n-jointed, 

 the club mu:h stouter than the last joint of funicle, half as long as the 

 scape and obliquely truncate at apex from beneath; pedicel obconical, as 

 long as joints 1-3 of funicle united; funicle 6-jointed, the first joint 

 a little longer than thick, the following transverse, gradually widening, 

 the three last being more than twice wider than long. 



Pro- and meso-notum smooth, polished, impunctate; scutellum, includ 

 ing the axillae, minutely shagreened with a few long hairs; metathorax 

 very short, smooth, the pleura bright cupreous, with white fimbria, the 

 spiracles round. Abdomen as long as the thorax, depressed, acute at tip, 

 with the sheaths of ovipositor somewhat prominent. 



Hab. Cambridge, Mass. (Bred from TJiyreodon m0rw, Fabr,) 



