138 



has yet been described,* is of peculiar interest owing to the structure 

 of the proboscis. While the proximal portion of this organ is a 

 strongly swollen, polished, chitinous bulb, the distal portion is 

 soft and fleshy, folded back under the distal end of the bulb when 

 not required, but when in use extended, its terminal section 



Philcematomyia insignis, Austen. 



Fig. II. — Proboscis of ?, with " tubular extension" not quite fully protruded from 

 between the hairy, fleshy labella ( x about 70). 



Fig. III. — Proboscis of o, with tubular extension fully protruded, showing circlet of 

 stout, black, chitinous teeth ( x about 70). 



consisting of a tubular extension, which is protruded from between 

 the labella, and is surrounded at the distal extremity with a circlet 

 of stout chitinous teeth (compare figs. I., II., and III.). When not 

 in use the proboscis can be entirely retracted within the buccal 

 cavity, so that it is invisible when the head is viewed in profile, 

 but, in dead specimens at any rate, it more usually protrudes, 

 * Cf. E. E. Austen, loc. cit., pp. 295-299. 



