32 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



Heteroderes nicholsi Notman (adult) the ventral muscle of the 

 labriim, j (fig. 74), arises laterally on the anterior region of the 

 clypeus ; this is an unusual point of origin for this muscle. In the 

 larval Parallelostethiis attenuatus (Say) there are posterior exten- 

 sions of the anterior tentorial arms that provide the points of origin 

 for the long labial muscles, 20 and 21 (figs. 72, 73). 



In Popillia japonica Newman, Scarabaeidae (adult) (figs. 75, 76, 

 yy), the labial muscles are absent and an unusual muscle in the 

 labium, jp (figs. y6, yy), is to be found only in this species. 



The levator muscle of the palpus, 24 (figs. 88, 89), in Macrobasis 

 iinmaculata (Say), Meloidae (adult), arises on the intralabial brace 

 {IR). 



In the larvae of Mordella quadri punctata (Say), Mordellidae, there 

 is present a thin apodeme (fig. 97, AP) that arises medianly in the 

 posterior region of the frons and extends deeply into the head cavity. 

 All the labral, cibarial, dorsal pharyngeal muscles, and the muscles of 

 the hypopharyngeal bar Y, 10, loA, loB (fig. 97), arise on this 

 apodeme. 



In the larva of Cyllene robinae (Forst.), Cerambycidae, there is 

 an uusual lobe that extends ventrally from the dorsal cibarial wall 

 into the mouth region (figs. 102, 104) ; the lobe is furnished with 

 muscle 40 and probably assists in some manner in food ingestion. 



The epipharynx is large and unusual in structure in the adult 

 Apatides fortis (Lee), Bostrichidae (fig, 106, EP). In the larva 

 of this species muscle 41 (fig. 108) is unusual in that it is not found 

 in the other insects studied in this work. 



In the adult of Leptinotarsa decimlineata (Say), Chrysomelidae, 

 branch JoA of the muscle of hypopharyngeal bar Y, 10 (figs, iii, 

 112), arises on the posterior surface of the epistomal suture (fig. 

 Ill, ES). In this species the ventral part of the labial wall is con- 

 nected with the anterior dorsal wall by means of an intralabial 

 tendonous structure (fig. 112, TS). 



The dorsal wMscle of the labium, 20 (figs. 118, 119), in Euparius 

 marmoreus (Oliv.), Platystomidae (adult), arises laterally in the 

 posterior region of the head, posterior to the tentorium, and is 

 inserted on the labium by means of a very long tendon. 



In the larva of Pantomorus leucoloma Boh., Curculionidae, the 

 resiUent median process (fig. 127, ME) that extends posteriorly from 

 the dorsal margin of the labrum probably does the work of a muscle 

 in assisting in the return of the labrum to its resting position after 

 the ventral muscle of the labrum, j, relaxes. 



