DIPTERA. 375 



as the first, but does not appear to me to l)e sufficiently removed from 

 the Oscini*. 



The fifth division, that of the Dolichockra, and which embraces 

 the genus called Tetanocera by M. Dumerii, closely approaches the 

 fourth ; but the length of the second joint of the antennae ■which is 

 here equal to that of the third, or the palette, and most frequently 

 surpasses it, serves to distinguish them. These organs, always dis- 

 tant and projecting, are, with but feAV exceptions, as long as the 

 head or longer, and terminated in a point. The superior plane of the 

 head forms an obtuse triangle, or one truncated at the apex. The 

 face is smooth or but slightly silky. 



In some the antennae are shorter than the head. 



Otites, Lat,, 



Where the seta of the antennae is simple and the inferior extremity 

 of the head, or its oral portion, does not project f. 



EUTHYCERA, Lat., 



Where the second joint of the antenna3 is larger than the following 

 one, almost square, and the latter is triangular and pointed, with a 

 plumous seta. The inferior extremity of the head projects in the 

 manner of a truncated snout \. 



The antennae of the others are manifestly as long as the head, or 

 longer. 



Sepedon, Lat. — Baccha, Fab., 



Where the antennae are considerably longer than the head, with the 

 second joint much longer than the last and cylindrical ; the latter forms 

 an elongated, pointed triangle, furnished with simple setae §. 



Tetanocera, Dum., Lat. — Scatophaga, Fab., 



Where the antennae are as long as tlie head, or a little longer, with 

 their second joint compressed, forming a long and narrow square, as 

 long as the third, or only a little longer ; the third joint is similar 



confounded with the preceding one. In Oscinis or Piophila and Chlorops, the sum- 

 mit of the head, as we have already stated, presents posteriorly a triangular space 

 sometimes even slightly prominent, and usually brown and glossy, on which the ocelli 

 are situated. The antenna; are always distant, and the seta is simple. The body alone 

 is pubescent. The legs are proportionally more robust than those of the Heleomyzae, 

 and it is evident that these Insects approach the Tetanocera. Messrs. Fallen and 

 Meigen have not sufficiently compared the characters of the genera they have esta- 

 blished, nor endeavoured to approximate them in a natural series, which makes it a 

 difficult matter to discern the difference between several of them. I have frequently 

 been embarrassed with genera, from which I could have been relieved by the work 

 of the latter, but it is not yet published. 



* See the Nouv. Diet. d'Hist. Nat. 2d edit., article Oscine, divis. II, and Lat., 

 Gener. Crust, et Insect., IV., 361 ; Oscinis lincata, and the following species. See 

 also with respect to Piophila, Fallen, Meigen, and Wiedemann — Analect. Entom. 



t Lat., Hist. Nat. des Crust, et des Insect. ; the second edition of the Nouv. 

 Diet. d'Hist. Nat. article Oscine, divis. I ; and Lat., Gener. Crust, et Insect., IV, 

 351 ; to this subgenus I also refer the Oscinis umhraculafa, Fab. 



X Scatophaga cheerophyUi, Fab. ; and some species of Tetanocera. 



§ Lat., Gener. Crust, et Insect., IV, 349. 



