152 THE CANADIAN ENTOMOLOGIST 



Stronger on the clypeus; the anterior margin of clypeus slightly 

 rounded; mandibles tridentate; face with a weak carinate median 

 line extending from the base of clypeus half way to the anterior 

 ocellus; eyes with only a very few scattered hairs, practically bare; 

 antennal pedicel and first flagellar joint subequal, and together 

 slightly longer than the scape; second flagellar joint a little shorter 

 than the first; following joints to the last gradualh' shortening, 

 apical joint nearly twice as long as the one before it, which is one 

 and one-half times as long as broad; ocelli in an obtuse triangle; 

 postocellar line much longer than the ocellocular; mesoscutum and 

 scutellum sculptured like the head, parapsidal grooves absent; 

 propleura longitudinally striate at least below; mesopleura a little 

 more coarsely and irregularly sculptured than the mesoscutum; 

 propodeum dorsally with coarse reticulations, the sides and posterior 

 face more finely rugulose-punctate; stigma subovate, the stigmal 

 vein slightly shorter than the width of stigma opposite; abdomen 

 smooth and polished, ovate, a little longer than the thorax. 



Male. — Agrees with female except as follows: palpi fuscous, 

 antennae wholly black, clypeus nearly truncate anteriorly, antennal 

 joints a little more distinctly separated than in the female, the 

 first flagellar joint scarcely longer than the second, flagellar joints 

 be>'ond the first subequal except the apical one which is about one 

 and one-half times as long as the penultimate joint. 



Type locality. — Cold Spring Harbor, Long Island, New York. 



Type.— Ca.t. No. 21604, U. S. N. M. 



Host. — Thelia bimaculata Fabr. 



One female and a male specimen sent to the Bureau of Ento- 

 mology by Prof. S. I. Kornhauser, of Northwestern University, 

 who is authority for the host record. 



Subsequent to the drawing up of the above description. Prof. 

 Kornhauser very kindly furnished the following note together 

 with twenty additional specimens of the insect: "Specimens were 

 reared from larva^ which bored through the sternites of the para- 

 sitized Thelia, dropped into jars of moist earth and there pupated. 

 Fifty to seventy larva? came from a single Thelia. This is a poly- 

 embryonic form. Oviposition takes place in early June, a single 

 egg being deposited within the Thelia nymph. Emergence of full- 

 grown larva' takes place from the middle to the end of July." 



