10 



SPHINGID^]. 



organ can be more or less retracted. The basal segment 

 is the thickest, and is usually equal in length to the third : 

 the second segment is shorter and is of less diameter than 

 the basal segment ; the third is the thinnest, and has at 

 its tip two bristles of varying (in different species) and 

 markedly unequal length. The colour is uniform in different 

 colour-forms of one species. 



A 



Fig. 3. — Larval head. 



A. Lower portion of the right lobe, seen from the front, showing position 



of eyes (greatly magnified). 



B. A diagrammatic view, seen from below, a, antenna ; c, clypeus : 



la, la brum ; li, ligula ; Ip, labial palpi ; md, mandibles ; mp, max- 

 illary palpi ; o, eyes ; s, spinneret. 



The eyes (figs. 2 A, j, 3 A) are situated partly on the cheeks 

 and partly on the gula. They are six in number on each 

 side, in a group just above the base of the antenna. They 

 are simple, round and convex, and are often raised on a 

 chitinous base. They are vitreous in appearance, often nearly 



