416 Transactions of the Society. 



solid piece which covers the groove on the dorsal surface of the 

 proboscis is the labrum or upper lip.' Desvoidy, however, says in 

 the same paragraph, ' Its base is enveloped by the base of the 

 labium of which the palpi are always present.' He regards the 

 palpi of the Diptera as labial, and not as maxillary, a conclusion 

 which appears to me unwarranted. They are without the slightest 

 doubt, maxillary palpi." 



