THE MOUTH-PARTS OF PANGONIA LONGIROSTRIS. 



263 



general surface to the apex, which is weak and practically colourless. There is, 

 however, as in the female, a rod of deeper chitin going down the galea, but it gradually 

 disappears before the apex is reached. The two galeae would, when brought 

 together, form a circular tube of which each piece would form one side, up which the 

 liquid food could be sucked. 



The apex (fig. 9) is covered with two series of hairs, in one of which the hairs are 

 long and point outwards and slightly forwards, those in the other (along the inner 

 edge) being shorter and pointing inwards and more forwards. The two series 



^^^r? 



Fig. 9. Apex of right maxilla (galea) 

 of $ ; greatly enlarged. 



approximate near the apex, but are more widely separated further down. Hairs 

 are found down to the base of the galea, but are not nearly so numerous as at the 

 apex, and further down the blade they lie in the centre in a direction parallel with 

 its edges. 



Maxillary palp. — Of the same length as in the female, but the comparative lengths 

 of the two joints are different, the second one being just over half as long again as 

 the first one, instead of being only three-quarters of its length. In addition to this, 

 the second joint is more uniform in width, ending more bluntly and not being so 

 drawn out as in the female. There are the same different types of hairs as are found 

 on the female's palp. 



(3). Labrum-epipharynx (text-fig. 10). — The most essential difference between this 

 organ and its counterpart in the female is found in the character of the apex. The 



Fig. 10. Apex of labrum-epipharynx 

 of <$ ; greatly enlarged. 



base of the blade is as strongly chitinised as in the female, but the rest of it has not 

 the same strength, as the chitin decreases, the apex being only feebly chitinised. 

 In contrast to the apex of the labrum-epipharynx in female, that of the male bears 

 no teeth, unless some serrations along the edges can be so called. It is, however^ 



