653. 

 CHRYSOTOXUM OCTOMACULATUM. 



Order Diptera. Fam. Syrphidae. 



Tyipe of the Genus, Musca arcuata Linn. 



Uhrysotoxum Meig., Lat., Macq., Curt. — Syrphus Fab., Panz. — 

 Mulio Fall. — Musca Linn. 



Antenna inserted on a small tubercle on the forehead, approxi- 

 mating, porrected, compressed, not longer than the head, 5- 

 jointed, 2 basal joints rather elongated, nearly of equal length, 

 and clavate, 2nd truncated obliquely, 3rd longer, subelliptic, 

 4th very minute, attached near the base of the 3rd, 5th a slender 

 naked seta, scarcely longer than the 3rd joint (3). 

 Labrum rather large, horny, hollow, slightly tapering, with 2 

 short filaments and 2 lateral lobes at the apex {\ b). 

 Tongue rather shorter, lanceolate and acute (e). 

 Maxilla short linear and curved, rounded at the apex (e). 

 Palpi longer, linear, straight, sparingly clothed with long hairs, 

 the apex rounded (/). 



Lip short but very large, the apex forming 2 large leathery lobes 

 slightly hairy (^). 

 [lead subtrigonate : eyes large, contiguous above in the male {1 ^), 

 remote in the female : ocelli 3 in triangle near the base ; face vertical, 

 concave, with a slight protuberance near the apex of the clypeus 

 (2 5). Thorax subglobose : scutel transverse, semiovate, unarmed. 

 Abdomen broader than the thorax, ovate, subdepressed, sides mar- 

 gined. Wings long, divaricating, 4th longitudinal nervure some- 

 times sinuated (9) : halteres small and clavate. hegs rather long 

 and slender : thighs tapering to the apex : tibiae clavate, curved, 

 compressed toivards the apex : tarsi 5 -jointed, basal joint long, espe- 

 cially in the hinder pair, 4th joint lunate, 5th short : claws acute ; 

 pulvUli bilobed (8, a fore foot). Obs. The dissections are taken 

 from C. marginatum Meig. 



OcTOMACULATUM Curt. Guidc, Gen. 1222, 5. 



In the Cabinets of Mr. Dale, Mr. Serrell, and the Author. 



Meigen places Chrysotoxum between Microdon (pi. 70), from 

 which it is readily distinguished by the neuration of the wings, 

 and Psarus, which has a linear abdomen, and antennae attached 

 to a distinct protuberance, the 3rd joint being short. The dif- 

 ferent species oi Chrysotoxum fly about hedges, alighting upon 

 the leaves and herbage ; the following are British : 



* Eyes naked. 



1. bicinctum Linn. — Panz. 45. 18. — Don. 10. pi. 316. 2.? 

 Abdomen black with 2 yellow bands; wings with a large 

 brown patch on the costa. 



June, July, Aug., Dover, Lulworth, Gl. Wootton, &c. 



2. arcuatum Lin7i. — Meig. 3. tab. 11- f. 7. ? . 



Abdomen black with 4 arcuated interrupted yellow bands. 

 June, July, Aug, flowers in hedges; abundant on Parley 



