8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



In the larval stage of Corydalus (figs. lo, ii, 12) the muscles 

 vary little from those of the adult, with a few exceptions and varia- 

 tions. Of the salivary muscles, // is absent. The dorsal dilator 

 muscles, 5 and 7 (figs. 10, 12), are represented by a single pair of 

 muscle groups. The ventral wall of the cibarium is furnished with 

 well-developed transverse, longitudinal, and diagonal muscle groups 

 (fig. II, S3)' These muscles were observed only in Neuroptera. 



In Hymenoptera, Spheciiis speciosus (Dru.) adults were selected 

 for study (figs. 13, 14, 15, 16). This species possesses muscles that 

 are massive and somewhat complicated in arrangement, and which 

 are not easy to homologize with muscles of Periplaneta, though cer- 

 tain of them can be considered homologous. The flexor muscle of 

 the paraglossa, 2g (fig. 13), arises basally on the ventral wall of the 

 prementum and is inserted at the base of the paraglossa. There is 

 present only one labial-palpus muscle, 24 (fig. 16) ; it is similar to 

 that found in Periplaneta. The dorsal salivary cup muscle, 16 (fig. 

 13), arises on the inner surface of sclerite X (fig. 14) and is in- 

 serted laterally on the salivary cup. The anterior salivary cup muscle, 

 18 (figs. 13, 16), which arises immediately posterior to the levator 

 muscle of the labial palpus, 24, on the ventral wall of the prementum, 

 is inserted laterally in the anterior region of the salivary cup. The 

 muscle of the hypo pharynx, ip (fig. 13), arises in the posterior re- 

 gion of the head and is inserted in the posterior region of the salivary 

 cup immediately ventrad and caudad of the dorsal salivary cup 

 muscle, 16. The ventral muscle of the labium, 21 (fig. 13), takes its 

 origin on the inner side of the base of the anterior tentorial arm 

 and is inserted centrally at the base of the prementum. The apparent 

 dorsal muscle of the labium, 20A (fig. 13), arises on the anterior 

 tentorial arm slightly above the ventral muscle of the labium, 21, and 

 is inserted on the base of the cardo proximally, so it probably be- 

 longs to the maxilla and not to the labium. The ventral muscle of the 

 labrum, 5 (figs. 14, 15), arises and is inserted in the usual manner. 

 The dorsal dilator muscles of the cibarium, 5, 6, 7 (figs. 14, 15), are 

 powerful and specialized. Muscle 5 arises centrally in the anterior 

 region of the clypeus and is inserted centrally in the anterior region 

 of the dorsal wall of the cibarium. Muscle 6 arises laterally in the 

 anterior region of the clypeus adjacent to the clypeal suture and is 

 inserted on the dorsal wall of the mid-region of the cibarium. 

 Muscle 7 is posterior to muscle 6 in origin and insertion. The com- 

 pressor muscle group of the cibarium, 12 (figs. 14, 15), is similar to 

 that of Periplaneta. The specialized muscle 34 (figs. 14, 15) arises 

 centrally on the dorsal surface of the modified bar Y (fig. 14) and 



