conopim;. 263 



tracted. The antennae are wart-like, with a chitinous, 

 ocellus-like ring on the extremity of each. The mouth- 

 hooklets are strongly bent. On the last segment there 

 are two large, round or reniform, stigmatic plates, arched 

 like a watch crystal. The puparium is oval, with but- 

 ton-like, slightly projecting, anterior stigmata, the post- 

 erior pair as in the larvae; it remains within the body 

 of the host during the winter. 



TABLE OF GENERA. 



1. Antennae with a terminal style; proboscis directed forward without 



median hinge; abdomen constricted toward the base. . 2 

 Antennae with a dorsal or subdorsal arista. .... 4 



2. Face with a median keel, without lateral grooves; a minute ocelli- 



gerous tubercle, the ocelli vestigial (4). . Tropidomyia. 

 Face with well-marked divergent grooves. .... 3 



3. Femora and tibiae not thickened or dilated, or, if so, the thicken- 



ing is regular; anterior cross-vein nearly opposite or before the 

 tip of the auxiliary vein, and near the middle of the discal cell; 

 ocelli functional or vestigial (1) . . . . . Conops. 



Femora irregularly thickened toward the base, the tibiae with irreg- 

 ular outlines; anterior cross-vein near outer third of discal cell; 

 ocelli vestigial (2). . . . . Physocephala. . 



4. Proboscis directed forward, not hinged backward. (3). Zodion. 

 Proboscis bent near middle, the distal part folding back. . 5 



5. Vertex with bristles; tibiae spurred; face carinate, not grooved; ovi- 



positor of female very long; anal cell small (8) . Stylogaster. 

 Vertex and tibiae without bristles; face with diverging grooves. 6 



6. Anal cell short; ovipositor elongate and folded beneath abdomen. 



(7) Dalmannia. 



Anal cell elongate, acute; ovipositor not folding beneath abdomen. 7 



7. Cheeks narrower than vertical diameter of eyes. ... 8 

 Cheeks as broad or broader than eyes (6). . . Myopa. 



8. Antennae longer than the front (5). . . . Occemyia. 

 Antennae shorter than the front. ..... Sicus. 



Fig. 101. Conopida?. 1, Conops xanthopareus, female; 2, Physocephala 

 farcillata, male; 8, Zodion fulvifrons, female; 4, Tropidomyia bimaculata; 5, 

 Occemyia modesta, female; 6, Myopa clausa, female; 7, Dalmannia picta, fe- 

 male; 8, Stylogaster neglecta, female. 



