iS. IV. WiUiston — JSTorth American Conopidm. 387 



"Body ferruginous, clotlied witli black hairs : head tawny, clothed 

 with black hairs, very large, pale yellow, and covered Avith whitish 

 hairs about the mouth: eyes pitchy : mouth black : feelers ferrugin- 

 ous ; first and second joints clothed with short black hairs; bristle 

 pitchy towards the tip: disk of the chest pitchy: abdomen longer 

 tlian the chest, adorned with patches of hoary down : legs ferruginous, 

 slightly covered with white bloom, clothed with black hairs; feet 

 tawny; claws black, tawny at the base ; foot-cushions yellow : wings 

 tawny along the borders of the veins; disks of the areolets slightly 

 gray ; wing ribs and poisers pale tawny ; veins tawny ; cross-veins 

 clouded with brown. Length of the body 3 lines. Nova Scotia." 

 Walker. 



CONOPIDM. 



Characters of the family. — Thinly pilose or nearly bare species. 

 Face nearly vertical or gently retreating. Head broader than the 

 thorax. Oral opening large ; proboscis slender, more or less elon- 

 gate, sometimes very much so, directed forwards, often with a joint 

 in the middle, the distal portion folding back. Front broad in both 

 sexes. Eyes bare. Antennae more or less elongated, usually angu- 

 lated at the base of the second joint, with a dorsal arista or terminal 

 style. Thorax large, short ; scutellum small ; tegulae small. Abdo- 

 men of six or seven segments. Legs simple. Wings elongate; 

 third longitudinal vein simple ; three posterior cells, the first closed 

 or much narrowed at the border ; anal cell closed. 



Conopinae. — Head large, swollen; face with median divaricate 

 grooves, large ; cheeks moderately broad ; vertical callosity swollen ; 

 ocelli present ; antennae elongate, the third joint not compressed ; 

 elongate, Avith a terminal, three-jointed style. Abdomen pedicillate 

 or much constricted at the base, club-like at the end, the terminal 

 segments bent downward, the fifth segment in the female with a 

 more or less conspicuous process below. Legs moderately stout. 

 Auxiliary vein of wings connected at its tip by a small cross-vein 

 Avith the first longitudinal vein ; anal cell acute. 



Small cross-vein of wings nearly opposite the tip of the auxiliary 

 vein and near the middle of the discal cell ;* femora and tibiae 

 not thickened or dilated, or if so, the thickening is regular ; third 

 joint of antennae usually as long as the second (plate xli, fig. 1). 



Conops. 



* I am not aware that this character has hitherto been made use of. It is, I 

 believe, of greater value than the structure of the legs, and will probably be found 

 to apply equally well to exotic species. The structure of the antennae is of less 

 value g-enerical1y. 



