388 S. W. WilUston — JVorth American Conopidm. 



Small cross-vein of wings near the outer third of discal cell ; hind 

 femora irregularly thickened toward tlie base, the tibiae with irregu- 

 lar outlines, third joint of antennae shorter than the second (plate 

 xli, fig. 2). Physoeephala, 



Myopinse. — Head large, inflated. Face with median grooves ; 

 cheeks broad or very broad ; third joint of the antennae oval, with a 

 short, thickened, two-jointed, median dorsal arista ; vertical callosity 

 not swollen. Abdomen somewhat narrowed at the base, the 

 terminal part always curved under; fifth segment of abdomen 

 usually with a more or less conspicuous process below ; the oviposi- 

 tor rarely elongated and bent forward beneath the abdomen, tiegs 

 stout. Auxiliary vein of the wing sometimes connected at its tip 

 by a small cross-vein with the first longitudinal vein. 



1. — Proboscis directed forwai'd, not bent near its middle (plate xli, 



figs. 3 and 4). Zodion. 



Proboscis bent near its middle, the terminal portion folding 



back. 2. 



2. — Anal cell short, rectangular; ovipositor elongate (plate xli, 



fig. 6). Dalmannia. 



Anal cell elongate, acute. 3. 



3. — Cheeks not as broad as the vertical diameter of the eye 



(plate, xli, fig. 6). Oneomyia. 



Cheeks as broad or broader than the vertical diameter of the eye 



(plate xli, fig. Y). Myopa. 



Stylogastrinae. — Face narrow, carinate, without or with very in- 

 distinct grooves ; proboscis elongate, the distal part folding back; 

 cheeks narrow; antennng with a subterminal arista, the third joint 

 more or less elongate ; ocellar tubercle small, ocelli present. Abdo- 

 men slender, not narrowed at the base, the tip not curved forward ; 

 female ovipositor extraordinarily elongated, directed backward. 

 Legs slender, tibia? with spurs. Auxiliary vein of the wings not 

 connected at its tip with the first longitudinal ; anal cell small, ob- 

 tuse (plate xli, fig. 8). Stylogaster. 



Larval characters. — "Larvse amphipneustic (perhaps tluring para- 

 sitism metapneustic), the anterior stigmata very small, point-like, 

 scarcely perforate, rudimentary. Form of body variable, the ante- 

 rior segments, however, thinner than the posterior ones, the larvre 

 hence oval or pear-shaped, with distinctly differentiated segments, 

 which may be contracted and extended, as in mature Hypoderma 

 larvae. Anteruue wart-shaped, with two ocelli-like chitinous rings at 

 the end. Mouth booklets strongly bent, Avith an obtuse downwardly 

 directed basal process and with thin slender points, thus, in fact, 

 like Cephatinomyia larvae, two-armed (zwei-arinig). (Ksophagns 



