BY R. J. TILLYARD. 813 



tivity, the insects feed willingly upon sugar moistened with water 

 and spread upon cottan-wool, using their mandibles to chew the 

 sticky crystals. 



The maxiUfe are of a very generalised type, with complete and 

 separate galea and lacinia, and an elongated, five-jointed palp. 

 The stipes is long, the cardo very short. The lacinia arises from 

 a broad oblique base, in the form of a simple elongated lobe with 

 rounded apex, and carrying numerous hairs. The galea is 

 remarkable in being set well above the lacinia, upon a short 

 transverse base formed as a definite projection from the stipes, 

 and also in carrying a small but very definite distal joint. The 

 basal joint is somewhat club-shaped, and carries numerous hairs 

 upon its distal half. It is possible that the existence of a distal 

 joint is an archaic feature, and that it ma}' prove to be of import- 

 ance in the study of the Phylogeny of the Holometabola. 



The maxillary palp is carried, in the position of rest, winh its 

 distal joint turned inwards almost at right angles to the other 

 four, as shown in Text- fig. I'J, h. The first and second joints are 

 shoi-t, the third twice as long as the second, the fourth shorter 

 than the third, and the distal joint longer than any, with a 

 somewhat pointed tip. 



The labium is in the form of a broad!}' rounded median lobe, 

 on each side of which there is a narrower lobe, also rounded, but 

 folded over above the median lobe, between it and the hypo- 

 pharynx. The median lobe carries hairs on either side, distally; 

 the two lateral lobes carry numerous hairs upon their upper 

 surfaces. The palps, which arise low down towards the base of 

 the median lobe, are three-jointed, the basal joint being the 

 shortest, and the distal the longest; each joint carries a few hairs. 



In the natural position, if the mouth be opened, there will be 

 seen abroad sub-triangular lobe projecting outwards and slightly 

 upwards above the labium. This is the hypopharynx (Text-fig. 

 \2,hp). Its distal border is well rounded, rather strongly 

 chitinised, and curved over; it carries no hairs. 



Bearing in mind the fact that the Psychopsidce are the most 

 ancient of existing l^lanipennia, as far as the Palieontological 

 record of this Order is known, it would seem that much valuable 



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