SERPHOID AND CHALCIDOID PAEASITES OF THE HESSIAN FLY 27 



abdomen. These characters will also serve to distinguish the female 

 from other parasites of the fly. The most striking characters for 

 recognition of the males are the distinctly thickened funicle and the 

 apically serrate ventral margin of hind femur. 



Female. — Length 1.7 to 3.25 mm. Head transverse, a little wider than the 

 thorax, over two and one half times as broad as thick antero-posteriorly at the 

 middle, moderately concave behind, temples strongly receding, about one fourth 

 as broad as the eyes, rounded into the occiput ; occiput immargined ; ocelli in a 

 low triangle, the postocellar line about twice the length of ocellocular, the latter 

 equal to about one and one half times the diameter of an ocellus; antennal 

 scrobe rather shallow, its lateral edges not sharp ; eyes moderately large, slightly 

 divergent anteriorly, distinctly ovate, and covered with a distinct short pile; 

 viewed from in front, the head subtriangular, narrowing below the eyes ; malar 

 space shorter than half the eye height; face with a median ridge which termi- 

 nates between the antennae ; clypeal margin straight or only very slightly con- 

 vex ; mandibles both tridentate, the teeth all acute or subacute ; maxillary palpi 

 4-jointed, the apical joint as long as the other three combined, slender, terminat- 

 ing in a long, slender, slightly curved seta which is about half as long as the 

 segment and with several additional shorter setae on the apical half of the inner 

 surface and about four on the outer surface; labial palpi 3-jointed, short, the 

 apical joint 2% to 3 times as long as thick, with several setae apically. Antennae 

 13-jointed, weakly clavate, inserted below middle of head or very slightly above 

 lower extremities of eyes ; scape attaining very nearly the level of front ocellus, 

 subcylindrical, slightly curved ; pedicel about twice as broad as long ; one dis- 

 tinct ring joint which is about three times as broad as long; funicle 7-jointed, 

 cylindrical, slightly thicker at apex than at base, the joints subequal and sub- 

 quadrate, or slightly transverse, loosely joined, the first joint frequently some- 

 what narrower than the following ; club 3-jointed, compact, very slightly thicker 

 than funicle, about as long as the three preceding funicle joints combined, 

 elongate-ovate, the sutures not very distinct ; funicle and club covered with short 

 hairs, and each provided with numerous elongate sensoria. Whole head closely 

 and finely punctate and clothed with conspicuous pale hairs. Thorax sculptured 

 like the head and similarly pubescent, a little less than twice as long as broad ; 

 pronotum moderately large, transverse ; mesonotum broader than long (30: 20) ; 

 parapsidal grooves sharply impressed, complete and strongly curved anteriorly; 

 scutellum slightly shorter than mesoscutum, sculptured like mesoscutum, finely 

 margined apically ; axillae broadly separated and sculptured like scutellum ; 

 propodeum short, distinctly but more weakly sculptured than scutellum, with 

 two longitudinal carinae near middle, the area between carinae nearly smooth ; 

 presternum, mesosternum, mesepisternum, and metapleurum not so strongly 

 sculptured as mesoscutum ; mesepimeron mostly smooth. Hind coxae rather 

 large, much larger than the anterior pair, compressed into a sharp edge dorsally 

 on apical half at least, and reticulate punctate on outer face ; posterior femora 

 a little swollen, with a few very weak serrations on ventral margins before 

 apices ; hind tibiae bicalcarate, the outer spur about half as long as the inner 

 one. Wings well developed ; anterior wing usually extending a little beyond apex 

 of abdomen, usually a little more than two and one half times as long as broad, 

 variable; marginal vein not quite half as long as submarginal, about two and 

 one half times stigmal ; postmarginal vein two thirds to three fourths the 

 length of marginal ; angle between stigmal and postmarginal vein narrow ; basal 

 and median veins more or less defined by rows of hairs, the basal cell with a 

 few discal cilia ; costal cell with very short cilia on ventral surface ; hind wing 

 nearly uniformly ciliated. Abdomen elongate-ovate, a little longer than head 

 and thorax, weakly reticulated dorsally, the first to third tergites emarginate 

 medially, first tergite constituting a little less than one third the total length 

 of abdomen ; ovipositor exserted one third to one half the length of abdomen. 



Color of head and dorsum of thorax green with a strong aeneous cast; eyes 

 reddish; mandibles yellow, with the teeth brown; palpi pale; antennal scape 

 mostly aeneous brown with the base pale or mostly pale with only the apex 

 above brownish ; flagellum dark brown or blackish with the club mostly pale 

 orange yellow; pleura and sterna varying from almost entirely yellowish to 

 entirely metallic green ; propodeum usually dark medially and anteriorly with 

 the posterior and lateral portions tending to yellowish; legs pale yellow, the 

 hind coxae varying from mostly metallic green to entirely pale yellow; wings 



