85 



the ends of the transverse portion of the sclerite. Each 

 pilifer bears on its inner margin a row of short bristly hairs, 

 light brown in color. There is also to be made out a very- 

 small, triangular piece projecting cephalad from the middle of 

 the transverse portion of the labrum. This is the epipharynx. 



Mandibles. — The fnandibles are wanting in Anosia. (They 

 are present in an aborted condition in some Lepidoptera ; 

 and in one genus of' small moths, Eriocephala, 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, termi- 

 nal portions of the maxilke. In addition, there is a fixed 

 basal part of each maxilla, which cannot be divided into 

 cardo and stipes. This basal part, shining brown, extends 

 caudad and ventrad,- partially bounding a cavity lying be- 

 tween it and the labium. The sucking tube consists of two 

 lateral portions, each portion representing a maxilla. These 

 parts are convex outwardly and concave inwardly. Ry the 

 opposition of the two concave aspects, a complete central 

 tube is formed. The mctxillary 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 /<?/'////// is a fixed, semi-membranous sclerite, 

 triangular in outline, with its apex projecting cephalad and 

 joining the maxillar proboscis at its base. The labial palpt 

 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. 



