ART. 11 CHEYSOTOXINE SYRPHID-FLIES SHANNON 17 



CHRYSOTOXUM FASCIOLATUM (De Geer) 



Two females, Charteuse, France (J. Herve-Bazin). Prof. J. 

 Herve-Bazin informs me that he has only females of this species 

 in his collection. 



Subgenus Chrysotoxum sensu stricto 



CHRYSOTOXUM BICINCTUM (Linnaeus) 



Musca 'bicinctum Linnaeus, Systema Naturae, 10 ed., 1758, p. 592. 



This species, together with the five species considered below, may 

 well be considered as a separate group from the above, the chief 

 difference being the greater combined length of the basal joints over 

 that of the third. 



Two males and two females: England, Lyndhurst (Verrall) ; Ger- 

 many; France, Bront-Vernet (H. du Buysson) and Ste Baume 

 Forest (W. R. Thompson) ; two females, Le Patys, Segre, France, 

 June 27, 1925 (Herve-Bazin and Shannon). 



The Kertesz Catalogue of Diptera, 1910, lists this species from 

 America. As far as the writer is aware hicinctwn does not occur 

 in the New World. 



CHRYSOTOXUM FESTIVUM (Linnaeus) 



Musca festimim Linnaeus, Systema Naturae, 10 ed., 1758, p. 593. 



This is apparently a very variable species of which the following 

 species, G. vernale Loew, may be a variation. On the other hand, 

 there is evidence in the material at hand to show that it may be a 

 complex of several species. One male has very pronouncedly pilose 

 eyes, whereas the other specimens have very sparsely pilose eyes. 

 A number of specimens have a distinct yellow spot above the fore 

 coxa and in others there is no trace of yellow at this position. One 

 female has the fore: side: hind margins of the fifth tergite in the 

 ratio of 5:1:4 and the width of the fifth sternite is about six times 

 its length. This may simply be one type of many abnormalities to 

 be found in the abdominal segments of the species of this genus. 

 However, the arcuate bands are much narrower than in the other 

 specimens. 



Twenty-one specimens of this species were taken in about five 

 hours' collecting at the home of Professor Herve-Bazin, at Le Patys, 

 Segre, France, June 27, 1925, by himself and wife and myself and 

 wife. Four females are also at hand from Berlin, Germany (C. 

 Schimer). 



CHRYSOTOXUM VERNALE Loew 



Chrysotoxum vernale Loew, Stettin. Ent. Zeit., vol. 2, 1841, p. 138. 

 Three males and three females, Berlin, Germany (C. Schimer) ; 

 and Toulouse, France (H. du Buysson) ; Charteuse, France (Herve- 

 Bazin). 



