PLATE XXVIII. 



Fig. 1. — Caudal aspect of head: ep, epicranium; e, compound eye; fo, 

 front ocellus; g, gena; fc, frontal cone; a, antennal segments; y, pro- 

 jection from gena; x, portion of membrane forming fold around 

 labium between procoxae. 



Fig. 2.— -Longitudinal section of front ocellus: cu, cuticula; hyp, hypo- 

 dermis; I, lens; ip, iris pigment; v, vitreous body; r, retinal cells; n, 

 nerve. 



Fig. 3. — Antenna. 



Fig. 4. — Cephalic aspect of head: ep, epicranium; e, compound eye; o, 

 ocellus; fo, front ocellus; g, gena; fc, frontal cone; a, antennal seg- 

 ments; OS, antennal socket. 



Fig. 5. — Ventral aspect of head: ep, epicranium; e, compound eye; fo, 

 front ocellus; g, gena; fc, frontal cone; as, antennal socket; p, pro- 

 jection from edge of antennal socket; y, projection from gena; /, 

 frons; Ip, ligamentary process of frons. 



Fig, 6. — Articulation between third and fourth antennal segments: a, 

 third segment; h, fourth segment; cor, corrugations; sh, sensory 

 |iairs, 



