1874 THE BUTTERFLIES OF NEW ENGLAND. 



Analytical Tables of Genera. 



ICHNEUMONIDAE. 



First segment of the depressed, pedunculate abdomen bent towards apex. 

 Ovipositor hidden or only slightly exserted. 



Abdomen 9 acute at tip, last ventral segment retracted. 



Scutellum flat or convex, gradually sloping to apex Ichneumon. 



Scutcllum gibbous, abruptly declivous behind Hoplismenus. 



Abdomen 9 obtuse at tip, last ventral segment not retracted Trogus. 



Ovipositor distinctly exserted. 



Areolet incomplete Hemiteles. 



Areolet complete Cry ptus. 



First segment of abdomen straight. 



Abdomen petiolate, compressed for at least posterior half. 



Cubito-discoidal cell receiving both recurrent nervures Ophion. 



Cubito-discoidal cell receiving but one recurrent nervure. 

 Spiracles of metathorax oval or elongate. 



Apical margin of clypeus truncate Exochllum. 



Apical margin of clypeus acutely angled or pointed Anomalon. 



Spiracles of metathorax round. 



Areolet large, rhomboidal Mesochorus. 



Areolet small Limneria. 



Abdomen sessile. 



Ovipositor arising from a ventral cleft Pimpla. 



Ovipositor arising from apex of abdomen Glypta. 



BRACONIDAE. 



Meeothoracic sutures distinct; marginal cell minute, remote from the apex of the wing 



Microdus. 

 Mesothoracic sutures invisible; marginal cell large, reaching apex of wing. 



Wings with two submarginal cells, the second confused with the third Apanteles. 



Wings with three submarginal cells, the second more or less complete Microgaster. 



CHALCIDIDAE. 



Tarsi 5-jointed. 



Hind femora much swollen Chalcis. 



Hind femora not much swollen. 



Middle tibiae with a strong apical spur. 



Club of antennae rounded Encyrtus . 



Club of antennae obliquely truncate Copidosoma. 



Middle tibiae with only a slight apical spur Pteromalus. 



Tarsi 4-jointed. 



Submarginal vein not broken Cirrospilus. 



Submarginal vein broken. 



Scutellum with two bristles near the middle Derostenus. 



Scutellum with four bristles, all behind middle Tetrastichus. 



Tarsi 3-joiuted Trichogramma. 



PROCTOTRUPIDAE. 



But one genus— Telenomiis— is considered. 



