PLATE XXIII. 



Tachytes distinctus. 



Fig. 7. — Ventral view of mouth parts; C, cardo (the paler inner half 

 may represent the lorum) ; d, sclerite before labial palpus; e, sclerite 

 before tip of mentum, connected with d; f, prong ("basal hooks of the 

 glossa") of the ventral plate of the glossa; GL, glossa; gr, ventral apical 

 furrow of ligula; LP, labial palpus; M, mentum; MD, base of mandible; 

 MP, maxillary palpus; MX galea of maxilla; O, ventral portion of oc- 

 ciput; PGL, paraglossa; SMT, submentum; ST, stipe; .r, ventral sup- 

 porting plate of ligula. 



Fig. 8. — Lateral view of mouth parts exclusive of maxillas and man- 

 dibles; symbols as in fig. 7; b, passage to the blind sac t; C, clypeus; D, 

 salivary duct; EPH, epiphaiynx; g, ventral plate of glossa; h, sclerite on 

 under side of the plate or scale, i, of paraglossa; k, basal scale of ligula; 

 L, labrum; o, passage to pharynx; p, anterior end or lobe of pharynx; 

 s, "hypopharyngeal sclerite" (Sharp) ; /, pouch or blind sac. 



Fig. 9. — Interior lateral view of maxilla; C, cardo; L, lacinia; SMT, 

 submentum; MX, galea; iV, less heavily chitinized inner portion of cardo, 

 may be the lorum; /.<, base of palpus; St, stipe. 



Fig. 10. — A nearly lateral view (ventral portion slightly inclined 

 toward observer) of the mouth parts exclusive of the mandibles; symbols 

 as in figs. 7 and 8; n, small sclerite under clypeus; r, "epipharyngeal 

 sclerites" (Sharp) = pharyngeal rods. 



Fig. 11. — Dor.sa! view of labium (slightly diagrammatic), to show the 

 path followed by food as indicated by the arrows, lettering as in fig. 8; 

 A, apical arrow, the beginning course for liquid food; 6, second slope of 

 ligula and passage to blind sac; c, lower edge of first slope to ligula; 

 .so, opening of salivary duct; .r, first slope of ligula. 



Fig. 12.- -One of the hooks in the middle field of a series along the 

 costal vein. A, of the second pair of wings. 



Fig. 13. — Anterior view of fore coxas of male, showing the coxal 

 process, H; tr, trochanter. 



