192 Mr. H. Scott on 



they are characterized by the great length and slenderuess 

 of the proboscis and the great reduction of the palpi. 



Labrum (fig. 9, labr.) very long and slender, tapering 

 gradually throughout to an exceedingly fine point ; under 

 a high power its upper surface is seen to be covered with 

 extremely minute and short hairs ; at the sides it is bent 

 strongly downwards, so as to form a groove on its posterior 

 (ventral) surface; in the balsam-mount it is slightly twisted, 

 so that one of these bent-over flanges is seen in face-view 

 near the apex ; this flange appears as a hyaline membrane, 

 the edge of which, near the apex of the labrum, is uneven, 

 being raised into several minute tooth-like prominence-s, 

 which, however, appear hardly definite enough to be regarded 

 as actual teeth. 



Hypo pharynx (figs. 9, hyp.^ & 11) also extremely long and 

 slender, being only just surpassed in length by the lal)rum, 

 narrowing gradually, but not ending in a point ; on the 

 contrary, the apex is slightly bifid, each minute prominence 

 bearing fine hairs ; the two lateral edges of the hypopharynx 

 also bear fine hairs near the apex. 



MaxiUce (fig. 9, mx^. — The lobes are long and slender, 

 but reach to less than half the length of the labrum and 

 hypopharynx ; they are almost hyaline, flattened, and blade- 

 like, with apex not pointed, but bluntly rounded. 



Palpi (figs. 9, 10) extremely short, and partly hidden by 

 the base of the proboscis; when detached and examined 

 separately (fig. 10) seen to consist of two parts separated by 

 a constriction, but there is no very definite articulation 

 of two distinct joints, so that it is hard to say whether 

 they should be regarded as truly two- or as one-joiuted. 

 The arrangement of minute hairs and long setae is shown 

 in fig. 10. The basal part is longer and narrower, the 

 apical shorter and broader. The apex is truncate, and 

 hollowed out into a deep blackish-pigmented cup, which 

 forms the dark spot mentioned above as so conspicuous in 

 the pupa. Under a high power the inner walls at the 

 bottom of this apical cup are seen to bear minute chitinous 

 ring-like structures, the exact nature of which I could not 

 determine. I am convinced that the above is the true form 

 of the palpi, and that no other joints have been broken off : 

 for, firstly, both palpi are exactly the same, and I saw no 

 trace of any other joints before or during the dissection of 

 the insect out of the pupa; secondly, the form and pig- 

 mentation of the hollow cup is quite definite and clear ; 

 thirdly, all ^ ^ of this genus have been described as 

 having the palpi either invisible or extremely short, and in 



