coNOPS. 305 



Thorax almost quadrate, slightly convex above, with a scapula on each 

 side ; scutellum small, semicircular. Wings lanceolate, finely pubes- 

 cent, incumbent and parallel in repose ; praDbrachial vein united with 

 the cubital towards the tip ; praibrachial and discal areolets long, the 

 latter closed near the posterior margin Ijy a transverse vein ; analareo- 

 let long, distinct, complete. Abdomen arched, rather long, with six 

 segments more or less slender towards the base, obclavate towards the 

 tip, which is incurved. Legs rather stout ; tibife very slightly curved, 

 compressed and dilated at the tips, in some cases with a transverse 

 suture ; tarsi rather brood ; ungues and onychia distinct. Malt. Abdo- 

 men with a projecting conical process on the fourth segment beneath. 



These flies frequent flowers ; their larvae are parasitic on those 

 of humble-bees. The second abdominal segment is very variable 

 in the degree of its contraction^ and the British species may be 

 grouped thus : — 



a. Abdomen more or less sessile. Species 1-8. 

 a a. Abdomen much petiolated. Species 9. 



Conopans, Edn., includes C. quadnfasciata and C.Jlavipes ; ConopSy 

 lldn., contains C. macrocephala ; and C. cerioiformh belongs to Cono- 

 jnlla, Rdu. 



1. vesictdaris, L.fn. 1903(1701); Gf.; Fb.; Mg. ; LI.; Fin.; 

 Ct. ; Mq. ; Ztt. — Mas. ci/lindrica, Mg. kl. Fern'.ginea, capite Jlavo 

 ar(/enteo-quadrmttato, thoracis disco plceo, alis stihcinereis ad costam 

 ferriujiueis, ahdomine flavo-imivittato busi piceo. Long. 6^ ; alar. 



12 Un. 



Ferruginous. Head yellow above and in front, with four silvery stripes ; 

 the outer pair along the eyes ; the inner pair diverging from the base 

 of the antcnucC to the peristoma. Bisc of the thorax ^nceous. TTings 

 slightly grey ; a ferruginous stripe occupying half the breadth from the 

 costa includes a greyish spot near the tip. Haltercs yello\\'. Abdomen 

 piceous towards the base ; hind border of the second segment yelloto. 



Eare. (E.) 



2. flavipes, L. fa. 190-t (1761); Fb.; Gm. ; Pz. fn. ! Ixx. 21, 



22 ; Flu. ; ]Mg. ; Mq. ; Ztt. ; Rdn. — trifasciata, Dg. — vesicularis, Hrs. ! 

 — melanocephala, Mg. kl. — macrocephala, Sch. Sml. ! cp. Nigra flavo- 

 varia, capite argenteo-biviltato, alis cinereis ad costam fuscis, pedtbusflavis, 

 femoribus nigro-fasciatis. Long. 5-5-|- ; alar. 9-10 lin. 



Black. Head yeUow above and in front ; ttco silvery stripes diverg- 

 ing from the base of the antennre to the peristoma ; vertex piceous, black 

 towards the antennse. Thorax with two yellow nearly round humeral 

 scapulcC ; scutellum yelloio along the hind border. Wings grey, brown 

 along the costa. Haltercs yellow. Abdomen bluish-black ; first segment 

 with a small yellow scapida on each side ; hind borders of the second and 

 third segments yelloio. Femora yellow at the base and at the tips ; tibiiv. 



VOL. I. * E 



