SYRPHUS CYLINDRICUS. 



SPECIFIC CHARACTER. 



Blackish, varied with yellow; abdomen, ex- 

 cepting the base of the tergum, yellow-ferrugi- 

 nous. 



DESCRIPTION. 



Male. Head yellowish-white, somewhat sil- 

 very, polished ; antennse, more deeply tinged 

 with yellow; tubercle of the hypostoma a little 

 dusky at tip ; eyes chesnut : thorax dark green- 

 ish-olivaceous, spot before the wings and scutel, 

 yellow : pleura black with yellow spots : pectus 

 black: feet, including the coxae, pale yellow: 

 tergum yellowish-ferruginous ; first segment and 

 base of the second black ; tip of the second seg- 

 ment either dull ferruginous or blackish; third 

 segment dull yellow, somewhat ferruginous at 

 base and tip : venter yellow at base, ferruginous 

 towards the tip. 



PLATE XI. 



K 



