366 C M. Osten Sacken: On Prof. Brauers imper: 



iiearly equivalent to bis Sicarii (Coenomyia, Chiromyza, Pachystomus), 

 which he puts among the Tanystoma. 



Latreille's Notacautha (Farn. Naturelles, 1825, p. 493), consist 

 of two tribes : Stratiomyidae and Xylophagi. Tlie latter contains : 

 Hermetia, Xylophagus Latr., which is our Subula, Beris and Cyphomyia. 

 In other words, his Notacantha are our Stratiomyidae, plus Subula only. 



In his Tanystoma the order is this : I Tabanidae (plus Acantho- 

 meridae); II Sicarii (Coenomyia, Chiromyza, Pachystomus, that is, our 

 Xylophagus) ; IV Leptidae. 



As Tribe III he has the Midasii, which, in a later work (Regne 

 Animal), he placed elsewhere. 



The other author who recognized the true importance of the 

 difFerences between Xylophagus and Subula is Westwood. He placed 

 the former among the Coenomyidae {=^ Sicarii Latr.); for the latter, 

 with Beris and Actina, he forms the family Beridae. Both families he 

 considers as Notacantha. 



My grouping of the families and genera in question agrees there- 

 fore, in the main, with that of Latreille. The only novelty is the 

 location of Arthropeas and Glutops, two genera which were unknown 

 to that author. 



Dr. Brauer's Xylophagidae, considered as a section of the Nota- 

 cantha, contain the following genera: 



93. Coenomyia; 94. Heterostomus Bigot; 95. (?) Lagarus Phil. 

 96. Arthropeas; 97, Glutops; 98. Xylophagus; 99. Pachystomus; 

 100. Antidoxiou; 101. Rhachicerus; 102. (V) Macroceromys Bigot. 

 103. Subula. 



From this list Liagarus, Pachystomus and Antidooßion must be 

 Struck out; Lagarus is a Chiromyza with an open discal cell; Pachy- 

 stomus is the same as Xylophagus, and Antidoxion the same as 

 Ehachicerus. 



It appears from this list that Dr. Brauer agrees, in the main, 

 with Loew's view. But he goes farther than Loew; he not only 

 coordinates Xylophagidae and Stratiomyidae; he subordinates them as 

 sections of the same family Notacantha, as distinguished from his 

 Tanystoma (Tabanidae + Leptidae; see Brauer 1. c. p. 43). 



He is led to this division by a character which he believes to have 

 discovered and to which he attributes an unusual importance: the 

 direction of the posterior branch of the fork of the third vein. When- 

 ever this branch reaches the margin of the wing before the middle 

 of the distance between the apex and the tip of the fourth vein, the 

 genus belongs to the Notacantha; whenever the end of that branch 



