JOURNAL OF ENTOMOLOGY AND ZOOLOGY 99 



angles and the labrum. There is a distinct oval tubercule near the 

 caudal margin of the clypeus and it is more strongly chitinized than 

 the labrum. The clypeo-labral suture is distinct, the labrum (Fig. 

 1, lb) slightly convex on its distal margin, the length and breadth 

 approximately equal. Laterad of the labrum and apparently articu- 

 lating with the caudo-lateral angles of the clypeus are functionless 

 mandibles (Fig. 1, md), the suture between these mandibles and 

 the genae being very distinct. Caudad of the mouth-cavity is the 

 mentum (Fig. 1, m), bearing a pair of two-segmented labial palpi 

 covered with setae and laterad of its proximal margin on each side 

 is a maxillary lobe (Fig. 1, ml). Each of these lobes consists of 

 three segments, a long proximal segment and two shorter distal 

 ones. A ventral view of the head (Fig. 2), shows a distinct suture 

 between the submentum and mentum and on the lateral margin, 

 near the proximal end of each maxillary lobe is a short maxillary 

 palpus (Fig. 2, mp). 



Archips argyrospila 



Later, Archips argyrospila, a tortricid, whose mouth-parts are 

 functional in the adult, was considered, and the same parts were 

 found to be present. The clypeus is well defined (Fig. 3, cl), the 

 clypeo-labral suture distinct and the margin slightly convex adjoin- 

 ing the labrum. The invaginations for the anterior arms of the 

 tentorium (Fig. 3, at) are very distinct and located along the lateral 

 margins of the clypeus. The labrum is well developed, much wider 

 than long, with distinct pillifers (Fig. 3, pf) at each disto-lateral 

 angle, bearing long setae along their mesal margins. The distal 

 margin of the labrum has a distinct tooth at the meson and below 

 it may be seen the epipharynx (Fig. 3, ep), projecting tongue-like 

 from beneath the labrum. In order to be sure of the homology of 

 this part, a preparation was made of the clypeus and labrum of a 

 preimago of Protoparce sexta, which shows a similar projection 

 from beneath the labrum. The ental surface of the cephalic aspect 

 of the head (Fig. 5) shows the distal margin of the labrum indi- 

 cated by a dotted line. The projecting part of the epipharynx (Fig. 

 5, ep) is shown to be continuous with that lining the ental surface 



