CharaJcteristik der Gattungen der Notacanthen. 369 



the described species is given, based on the structure of the antenuae. 

 In my Enumer. Dipt. Malay Archip. p. 21 I have shown there is no 

 reason to separate Antidoxion from Rhachicerus, and I based this 

 Statement upon the comparison of an Antidoxion from Sumatra witli 

 an imdescribed Rhachicerus from Brazil, which I have seen in the 

 Museum in Vienna. The identity of both genera has beeen recog*- 

 nized by Gerstaecker at the time of the publication of Antidoxion 

 (Entomol. Bericht 1863, p. 410). 



Rhachicerns (Syn. Antidoxion) shows a very stricking character in 

 the deep emargination of the eye, on the frontal side; only a sHght 

 vestige of such an emargination is visible in Subula. Besides N.- and 

 S. -America and the Malay Archipelago, Rhachicerus has also been 

 found in Europe (Spain ; see Loew, Beschr. Eur. Dipt. I, 24). 



Solva (p. 17 at bottom). There is no doubt about the identity 

 of Solva with Subula; compare my Statements in Enum. etc. p. 19, 

 based on Mr. Walk er' s types in London. 



JEiOCOchostoma. The locality is given as: „Nord -Amerika, Süd- 

 Europa" (p. 13, No. 17, also p. 31). The species from North America, 

 although not otherweise indicated, is of course the E. caloceps Bigot, 

 Ann. S. E. Fr. 1879, p. 217. I have not seen this species, but the 

 description makes me suspect that it is an Odontomyia with an un- 

 armed scutellum (like 0. nigrirostris Lw.). Exochostoma is described 

 as having two spines on the scutellum, a coloring of an entirely 

 different character etc. 



On p. 12 (No. 58, NB.) Dr. B. says: „Die Gatt. Exochostoma 

 Macq. unterscheidet sich von den Verwandten dieser Gruppe durch die 

 einfach bleibende dritte Längsader.'' Again on p. 27, line 7 from 

 bottom: „dritte Längsader am Ende einfach, daher zweite Submarginal- 

 querader fehlend." This Statement is apparently based upon Macquart' s 

 figure, notoriously bad as they are. The description says explicitly: 

 „deux sousmarginales: premiere assez longue et etroite; deuxieme 

 petite, apicale, eloignee de la marginale," which, of course implies 

 a fork on the third vein. Had Dr. B. any other source of information 

 about the venation of this genus? 



Arthropeas (p. 17, No. 112, 113). Here again, Dr. B.'s state- 

 ment disagrees from those found elsewhere, and yet, this disagreement 

 is not alluded to, nor explained. Arthropeas is placed (1. c.) among 

 the genera with an open anal cell. According to Loew's figure in 

 the Stett. Ent. Z. 1850, Tab. I, fig. 46, the only published source of 



