THE 



ENTOMOLOGIST'S 

 MONTHLY MAGAZINE 



SECOND SERIES-VOL. XIII. 



[VOLUME XXXVIIL] 



NOTE ON ACLETOXENUS SYRPHOIDES, Feauenfeld. 

 BY J. E. COLLIN, F.E.S. 



(Plate I.) 



The genus Acletoxenus belongs to the subfamily DrosopliilincB (as 

 defined by Schiner) of the Aealyptrate Muscidce, and because of the 

 absence of the nervure separating the second basal from the discal 

 cell, and its bare arista, it approaches Aulacigaster and Qitona* 



In Aulacigaster, however, the middle cross-vein is considerably 

 nearer the base of the wing, being opposite a point in the costa about 

 midway between the humeral cross-vein and the end of the subcostal 

 (first longitudinal) vein, and the head is differently shaped with a 

 produced mouth-edge and only two pairs of fronto-orbital bristles ; 

 A. ruftfarsis has two pairs of the outer dorsal row of bristles on the 

 thorax, the front pair being about halfway down, no presutural bristle 

 and only one sternopleural bristle. The absence of ocellar bristles 

 and the continuation of the costa to the end of the discal (fourth 

 longitudinal) vein, are characters common to both Aulacigaster and 

 Acletoxenus. 



In Gitona the middle cross-vein is opposite the end of the sub- 

 costal vein, and only separated from the outer cross-vein by a little 

 more than the length of that cross-vein ; it has strongly developed 

 ocellar bristles and rather smaller eyes and consequently larger jowls. 



Acletoxenus syrpiioides, Frauenf., Verh. z.-b. Ges. Wien (1868), 



152, 897. 

 <J ? . Head in profile semicircular, eyes occupying almost the entire side of 



* It should be noticed that in Schiner's table on page xiii of his " Fauna Austriaca Diptera, 

 II," the position of the words " 488. Gatt. Aulacigaster. 209 " and " 492. Gatt. Gitona. 274 " should 

 bo reversed [y. Frauenf. Verh. z.-b. Wien, xviii (1868) 151, note at the bottom of page]. 



UABY, 1902. 



