
No. 429.] THE MOUTH PARTS OF INSECTS. 705 

FIG. 25. 

Fic. 24. 
Fic. 23. — Frontal "iie through the head of old larva of Simulium sp., showing forming 
imaginal parts. imaginal derm; /.d., larval mandible; imd., 
imaginal man ean dai larval maxi íi.mzx., imaginal maxilla; Z.»«&x.5., evil wack 
lary palpus; Tad id ypopharyn 
Fic. 24. — Mouth parts of adult Bibiocephala doanei, female; md., mandible; 
axilla; 
mx.d., maxillary lobe; mx a ., maxi palpus; /2., Bian; A. a. a ep., la- 
brum-epipharynx; 4y., hypopharynx. 
Fic. 25. — Mouth pa of larva of PEAS doanei. md., mandible; mæ., maxilla; ZZ, 
PA, qiiia pipharynx; yypopharynx. 
Fic, 26. — Frontal section, through head of old larva of Bibiocephala doanei, showing forming 
imaginal head ithin. Zc., larval head wall; z.d., imaginal derm; z.e., imaginal eye; 
Zmd., larval — t.md., imaginal mandible; Z.»x., larval maxilla; z.»x.., imagi- 
nal maxillary palpus 
