28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



EXPLANATION OF PLATES 

 Plate i 



A. Internal view of hypothetical labium showing origins and insertions of 



all labial muscles. 



B. Periplaneta amcricana L. (adult). External view of muscles of labium. 



C. HarpaJus sp. (adult). External view of muscles of labium. 



D. Byrrhns sp. (larva). External view of muscles of labium. 



Plate 2 



A. Cicindela hirticollis Say (larva). Ventral view of labium. 



B. Cicindela hirticollis Say (larva). Ventrolateral view of left tentorial muscles 



of labium and hypopharynx. 



C. Harpalus sp. (larva). Ventral view of labium. 



D. Amphisoa (iiuolens hec.) ? (larva). Ventral view of labium. 



E. Dytiscus sp. (larva). Ventral view of labium. 



F. Dincutcs sp. (larva). Ventral view of labium. 



Plate 3 



A. Silpha sp. (larva). Ventral view of labium. 



B. Hesperus baltimorensis Grav. (larva). Ventral view of labium. 



C. Hololepta sp. (larva). Ventral view of labium. 



D. Hydrous triangtilaris Say (larva). Ventral view of labium. 



E. Langnria laeta Lee. (larva). Ventral view of labium. 



F. Cucujus clavipes Fab. (larva). Ventral view of labium. 



G. Orycacphilus surinamensis (L.) (larva). Ventral view of labium. 



H. Eununsibivs ivhcelcri Schwartz and Barber (larva). Ventral view of labium. 



Plate 4 



A. Nitidulidae (larva). Ventral view of labium. 



B. Endomychidae (larva). Ventral view of labium. 



C. Mycctophagus sp. (larva). Ventral view of labium. 



D. Tritoma unicolor Say (larva). Ventral view of labium. 



E. Anthicus sp. (larva). Ventral view of labium. 



F. Byturus (unicolor Say)? (larva). Ventral view of labium. 



G. Colydiidae (larva). Ventral view of labium. 



Plate 5 



A. Synchroa punctata Newm. (larva). Ventral view of labium. 



B. Dendroidcs bicolor Newm. (larva). Ventral view of labium. 



C. Merinus laevis (Oliv.) (larva). Ventral view of labium. 



D. Pytho sp. (larva). Ventral view of labium. 



E. Hymcnorus sp. (larva). Ventral view of labium. 



F. Lagriidae (larva). Ventral view of labium. 



G. Byrrhiis sp. (larva). Ventral view of labium. 



H. PrioiicypJwn discoideus (Say) (larva). Ventral view of labium. 



