NO. 7 MUSCULATURE OF COLEOPTERA— DORSEY 23 



XVI. MORDELLOIDEA 



Mordella quadripunctata (Say), Mordellidae (figs. 93, 94, 95), is 

 the adult form used for study in this superfamily. The muscles are 

 powerful and well developed. The cibarial, pharyngeal, and hypo- 

 pharyngeal muscles are of the generalized form. Hypopharyngeal 

 bar Y (fig. 93) is weakly sclerotized. The muscle of the prementum, 

 22 (fig. 95), might be the ventral muscle of the labium, 21, with the 

 origin moved anteriorly from the tentorial structure rather than 

 muscle 22, though it is difficult to interpret a condition like this. The 

 ventral dilator muscle of the pharynx, jo (fig. 93), and the lateral 

 dilator muscle of the pharynx, 57 (fig. 93), are present, the latter 

 being very large. There is a sclerotized subpharyngeal rod (fig. 

 93) that lies immediately under the mouth opening; it terminates 

 laterally in the integument of the posterior dorsal hypopharyngeal 

 area. 



The larvae studied are of the same species as the adult (figs. 96, 

 97> 9^)- The musculature is, as the figures indicate, well developed 

 and unusual. There is a large, thin, sclerotized apodeme that extends 

 ventrally from the center of the middle region of the frons on which 

 the ventral muscle of the labrum, j (fig. 97), the muscle of hypo- 

 pharyngeal bar Y, 10, loA, loB (fig. 97), and the dorsal dilator 

 muscle of the pharynx, 11 (fig. 97), all take their origin. The ventral 

 muscle of the labrum, j (figs. 96, 97), is inserted on the distal end 

 of a modified torma that originates on the ventral labral wall and 

 which extends laterally and dorsally. The dorsal dilator muscles of 

 the cibarium, 6 and 7 (fig. 97), are thin and very long; the muscle 

 of hypopharyngeal bar Y, 10, 10 A, loB (fig. 97), is divided into 

 three branches and the dorsal dilator muscle of the pharynx, 11 (fig. 

 97), originates on the ventral margin of the posterior region of the 

 apodeme. The labial muscles, 20 and 22 (figs. 97, 98), do not re- 

 quire special comment as the figures are self-explanatory. There is 

 present a rigid, heavily sclerotized, subpharyngeal intralabial structure, 

 IR (fig. 97). The crosspiece that lies beneath the anterior region 

 of the pharynx terminates in the lateral integumental wall of the 

 posterior labial or hypopharyngeal region. 



XVII. CERAMBYCOIDEA 



The adults studied in this superfamily are Cyllene robiniae 

 (Forst.), Cerambycidae, Cerambycinae, and Prionus pocularis Dalm., 

 Prioninae. 



In Cyllene (figs. 99, 100, loi) the muscles are well developed and 

 are of the generalized plan. The muscle of hypopharyngeal bar Y, 



