215 



Holmgren, 1 who states that the " ectolabium " of Bengtsson is 

 the mentum of a typical labium, and that the supposed " endo- 

 labium " represents the galeœ and lacinia- thereof ; all these structures 

 are, according to Holmgren, supplied by the labial nerve, Bengt- 

 sson's " endolabial nerve " being in reality a muscle-fibre. The 

 existence of maxilluhe among the larvie of Diptera must, therefore, 

 be regarded as exceedingly doubtful, 



* Zeitsch. /. wissensch. Zool., Ixxvi., 1904, pp. 43<j-77, ;:nd ZmI. An:., 

 xxxii., lijoj, pp. 73-97. 



