I04 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



41. Inferior phragmatic levator of the head (fig. 12 A). — One of 

 a pair of long muscles arising laterally on prephragma of mesonotum, 

 converging beneath 40 to insertion in dorsal angle of foramen 

 magnum. {Rotator capitis superior Morison.) 



42. Pleural levator, or rotator, of the head (fig. 12 B, D). — A large, 

 three-branched muscle arising on episternum, inserted by common 

 tendon attached in laterodorsal notch of foramen magnum ; none of 

 its fibers observed to arise on endosternum as stated by Morison. 

 {Rotator capitis inferior Morison ; pleural elevator of the head 

 Duncan.) 



45. Endosternal levator, or rotator, of the head (fig. 12 B, C). — 

 A large muscle with wide base on dorsal surface of prothoracic endo- 

 sternum, fibers convergent on long thick tendon attached in latero- 

 dorsal notch of foramen magnum above 42. {Levator capitis obliquus 

 Morison; f ureal elevator of the head Duncan.) 



44. Depressor of the head (fig. 12 B). — A large muscle of two 

 parts arising on dorsal surface of prothoracic endosternum anterior 

 to 4 J, inserted by strong tendon on ventral margin of foramen 

 magnum. {Depressor capitis horisontalis Morison; first and second 

 depressors of the head Duncan.) 



45. Intersegmental dorsal muscle of the prothorax (figs. 11 F, 

 12 A). — A thick muscle arising on middle of pronotum, attached 

 posteriorly on prephragma of mesonotum; probably depresses the 

 pronotum. {Depressor prothoracis Morison; inner pronotal retractor 

 of the mesonotum Duncan.) 



46. Phragma to pleural muscle of the prothorax (fig. 12 A). — 

 Arises farthest laterad on prephragma of mesonotum, attached an- 

 teriorly on cervical apodeme of pleuron. (Lateral branch of levator 

 prothoracis internus Morison ; anterior notal elevator of the pro- 

 pleuron and head Duncan.) 



4y. A small prothoracic muscle attached close to 46 on cervical 

 apodeme of pleuron (fig. 12 A, B) may be a branch of 48, though its 

 fibers appear to run along the under side of the latter. 



48. Tergoepisternal muscle of the prothorax (fig. 12 A). — A 

 large, straplike muscle arising mesally on posterior inflection of pro- 

 notum (not on phragma), attached anteriorly on horizontal apodeme 

 of episternum (A, B). {Levator prothoracis externus Morison.) 



49, 50. Protractors of the propectus (fig. 12 B, C).— Two fan- 

 shaped muscles arising anteriorly on side of pronotum, inserted on 

 apex of pleural apophysis. {Depressor episterni prothoracis anterior 

 and posterior Morison ; first and second posterior notal protractors of 

 the pro pleuron Duncan.) 



