ADDITIONS TO VOLUME IV. 



(By C. R. Osten-Sacken.) 



Page 4. Ptychoptera. The larvae of this genus examined by Brauer, 

 differ from all the known larvae of Tipulidae in having the head not im- 

 bedded up to the mouth in the first thoracic segment, but entirely free. 

 This observation justifies the isolated position which I have given to this 

 group in the family. Compare Verh. Zool. Bot. Gres. 1869, p. 844. 



Page 23. The analytical table, given here, would be improved by 

 being modified thus : — 



I. A single snbmarginal cell. 



Antennae 14-jointed. Antennae 16-jointed. 



Empodia indistinct or none. Sect. II. Limnobina anomala. 



Sect. I. Limnobina. 



II. Two submarginal cells. Empodia distinct, etc. etc. 



Page 49. The same modification may be made on this page. 



Page 57. Dicranomyia. My remarks concerning the differences 

 between this genus and Limnobia apply to those North American and 

 European species which I had occasion to compare. I have accumulated 

 as many distinctive characters as a careful comparison of the material 

 before me could disclose ; but I should not wonder at all if forms occurred 

 the location of which remained doubtful, all the enumerated distinctive 

 characters notwithstanding. 



Page 81. Mr. Loew draws my attention to the fact, that the antennae 

 of Rhipidia cannot be properly called pedicelled, because the short stems, 

 connecting the joints, are processes of the anterior part of the joint and 

 not of the posterior one. 



Page 102. Styringomyia. During my passage through Stockholm in 

 1872, I made the interesting discovery that this genus, besides its occur- 

 rence in amber and copal, is found living in Africa. I saw several speci- 

 mens among the unnamed diptera from Caffraria (from Wahlberg's 

 voyage) in the Stockholm Museum. The species was apparently different 

 from that included in copal, which I possess. , 



( vii ,) 



