— 6o — 



projecting cephalad from the meson of the transverse portion 

 of the labrum. This is the epipharynx, a process rising 

 from the upper wall of the pharynx. 



Mandibles. — The mandibles are wanting in Anosia. 

 (They are present in an aborted condition in many Lepi- 

 doptera ; and in one genus of small moths, Micropteryx, are 

 present and functional, constituting, with the maxillae which 

 are not produced into a sucking tube, true biting mouth- 

 parts. ) 



Maxillae. — The long, coiling, sucking tube of Anosia 

 (as of all the Lepidoptera possessing functional sucking 

 mouth parts) is composed of the greatly extended, opposed, 

 terminal portions of the maxilla;. In addition there is a 

 fixed basal part of each maxilla, which cannot be divided 

 into cardo and stipes. This basal part, shining brown, ex- 

 tends caudad and ventrad, partially bounding a cavity lying 

 between it and the labium. The sucking tube consists of 

 two lateral portions, each portion representing a maxilla. 

 These parts are convex laterad and concave mesad. By the 

 opposition of the two concave aspects, a complete central 

 tube is formed. The maxillary palpi are wanting in Anosia, 

 and in most of the butterflies, although present in a one- or 

 two- or even several-segmented condition among most of the 

 moths. 



Labium. —The labium is a fixed, semi-membranous scler- 

 ite, triangular in outline, with its apex projecting cephalad 

 and joining the maxillar proboscis at its base. The labial 

 palpi are large, three-jointed, and covered with scales, and 

 normally project cephalo-dorsad. They are inserted on 

 tumid spaces on the base of the triangular labium, and the 

 first joint is pedicellate. 



Make a drawing of the cephalic aspect of the head show- 

 ing the fixed and movable parts. 



