380 Osten Sacken: On Prof. Brauer s Char. d. Notacanthen. 



Coenitra Bigot, according to Dr. B. belongs to tlie Pangouina 

 (1. c. p. 4). This same opinion was expressed by Dr. Gerstaecker 

 at the time of the publication of Coenura (Entomol. Bericht 1857, 

 p. 203). It may be correct; but the telescope-like elongation of the 

 abdomen of the female is not a character of the Pangonina. Dr. Schiner 

 who could compare specimens of Coenura said that the relationship 

 with Arthropeas could hardly be called in doubt (Novara 75). I feit 

 inclined to follow this view, when I saw Coenura in Mr. Bigot's 

 collection; hence my opinion, as expressed in the Catal. N. Am. Dipt. 

 Note 48. I am much less positive now, and would leave Coenura 

 among the Xylophagidae. Nevertheless I would observe that the State- 

 ment of Philippi about the motions of Coenura (hovering, suddenly 

 flying away, and returning to the same spot; Verh. Z. B. Ges. 1865, 

 p. 726) calls to mind the behaviour of a Tabanid, rather than the slow 

 motions of a Coenomyia. At any rate, I agree with Dr. B. in removing 

 Coenura from among the Notacantha. 



Sylorus and Lagarus belong in the same group with Chiromyza 

 (as I have already shown above). But whether Loew (Monogr. N. Am. 

 Dipt. I, 17) and Dr. B. (1. c, p. 29) are right in placing them in the 

 vicinity of the Beridina, I do not know. Latreille (Farn. Nat.) has 

 Chiromyza among his Sicarii (which answer my Xylophagidae); the 

 extensile t'.bdomen of the female of Chiromyza favors that view. On 

 the other band, the venation (veins crowded (owards the anterior 

 margin, short praefurca etc.) is more like that of the Stratiomyidae. 

 Chiromyza may be a synthetic type of a high order, intermediate 

 between Tanystoma and Notacantha. This would explain its simultaneous 

 occurence in Australia and S, America. Similar forms of transition 

 Tanyderus (Tipulidae) and Apiocera (Asilidae) also occur in those 

 two continents. 



Although I discovered Bolbomyia in the United States many years 

 ago (see Loew, Cent. II, 5) I do not remember it and have nothing 

 to say about it. 



About the Acanthomeridae I agree with Dr. Brauer, that they 

 are more related to the Tabanidae and Leptidae, than to the Stratiomyidae. 



