the Generic Same Ceratopogon. 



129 



by communis. Tlie description of 1804 is altogetlier inade- 

 quate, but in 1818 he adds the information " Alle Schenkel 

 einfacli, wehrlos," and in 1830 " Mit nacktcn Flugeln." The 

 name Ceratopogon must, therefore, be used for one of the 

 groups with bare or practically bare wing.s. 



In liis original description of C. communis (1804) Meigeu 

 says " AJan findet sie im Sommer sehr haufig auf Schirmge- 

 waclisen." This habitat agrees with that of C. pavidus, 

 Winn., and its allies, several species of which occur in great 

 numbers on flower-heads of Angelica, but not with that of the 

 other bare-winged groups, the femah-.s of which are preda- 

 ceous and are only seldom found on flowers. Malloch, in his 

 ' Ciiironomidae of Illinois' (1915), has adopted the name 

 Ceratopogon for this group of species (which Kieffcr includes 

 under the genera Atrichopogon and Kempia), and I was at 

 fiist inclined to follow him in this respect. 



However, in order to make quite sure, if possible, of the 

 identity of C. communis, I wrote to Muns. Seguy, of the Paris 

 Museum, asking him for information as to Meigen's type, if 

 it should be in existence. His repoit was surprising, but 

 decisive, as from his notes and the carefully drawn sketch of 

 the wing of the type male which he sent (reproduced herewith) 



Ceratopogon communis, J . Drawn b}' E. S^^'^uy. 



it is clear that C. communis diff"ers in some respects from all 

 the species described by Winnertz, and will not tit into any 

 of the genera into which the group has been divided by 

 Kit'ffer, though it shows relations with several. 



The genus Ceratopogon must therefore for the presint 

 include only the single species commmds, Mg., and may bo 

 diagnosed as follows, from M. IS^guy's information : — 



Ceratopogon (Meigen, 1803), Edwards, 1920. 



J . Claws simple, equal. No empodia. Femora slender, 

 unarmed. E]yes quite bare. Wings with microscopic |)ubos- 

 cence (microtrichia) over the whole surface, and with a few 



Ann, c& Mag. iV. Hist. Ser. 9. Vol. vi. 9 



