OF THE MOUTH PAUTS OF CERTAIN' IXSEfTS. li)7 



Explanation of the Plates. 



The lutteriug of Ihe paits, llie same lliroughout, and the abbreviations, arc as follows : Lhr, labrum ; epi, 

 epipbarynx (tlie two sometimes combined as Ibr-epi) ; md, maQdil)le ; ear, cardo ; st, stipes ; pfr, piilpifer ; mp, 

 maxillary palpus ; ffal, galea ; sj, subgalea ; lac, lacinia ; dii/, digitus ; sm, submentum ; m, meutum ; gl, ligula or 

 glossa ; par, paraglossa ; Ip, labial jialpi ; /ii/p, bypopharynx. 



J'late I. 



Fig. 1. liullalo gnat. 1", galear structures with palpi attached ; 1'', labial structures; l"", lacinia and palpifer ol 

 Simulium from Aldrich ; I'i, labrum and labium of Simulium from Aldrich ; l*", transverse section through 

 middle of mouth of Buffalo gnat. 



Fig. 2. Simulium from Auglesea, N. .1. 3", the maxillary structures in llieir actual relation to each otlier ; 2'', 

 transverse section of mouth parts toward the base of subgalea. 



Fig. 3. Jlouth parts of Eristalis tenax. 3", transverse section of same at the middle of subgalea. 



Fig. 4. Copris Carolina, epipbarynx. 



Fig. 5. Mouth structures of Tipula sp.; 5", the chitinous parts of the same. 



Fig. 6. Copris Carolina ; labial structures dissected out and seen from side. 



Fig. 7. Copris Carolina ; chitinous part of under side of head. 



Fig. 8. Copris Carolina; mandible with the sclerites named and homologized. 



Fig. 9. Andrena vicina ; labial structures, with part of epipbarynx attached. 



Fig. 10. Libellahi sp. a, the epipharj'nx ; b, the hypopharynx. 



Fig. 11. Stomoxys calcilrans ; transverse section through the middle of the ligula. 



Fig. 12. Slouth parts of Euparyphus bellus. 



riabi II. 



Maxillary structure of Leplis sp. 



Palpifer of Stratiomyin. 



Palpifer of Eulonchus tristis. 



Palpifer of Empis sprctabilis. 



Palpifer of Spharophoria cylindrica. 



Palpifer of Bombylias. 



Palpifer of Anthrax. 



Palpifer of Chrysojn viitatus. 



Palpifer of Simulium. 



Palpifer of Lucillia. 



Palpifer of Callipfiora. 



Palpifer of Stomoxys. 

 Figs. 10 to 12 inclusive were accidentally reversed in making up the plate. 

 Fig. 13. Mouth parts of Empis spectabilis. 13", elongated head structure at tip, showing mandibles and epipbarynx ; 



13'', transverse section at middle of subgalea. 

 Fig. 14. Jlouth parts of C/u-ysops tiftalus showing maxillary structures attached together. H", the lacinia ; 14^ pal- 

 pifer and palpus ; 14'", transverse section at middle of galea. 

 Fig. 1"). Labial structures of Xenoglossa pruinota. a, transverse section at about middle. 

 Fig. 16. Labial structures of Periplaneta orientalis. 

 Fig. 17. Maxillary structures of Uermetia mucent. 

 Fig. 18. Mouth structures of Foliates metricus. 18", ligula, paraglossa and mouth opening ; 18^ labium as a whole, 



with epipbarynx attached ; 18'-', maxilla. 

 Fig. 19. Maxilla of Olfersia. 19", seen from front ; 19'', seen from behind or below. 



