348 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 37 



This very short muscle runs between the outer ends of the f ureal 

 arms and the lower end of the pleural sulcus. It presumably supple- 

 ments the superior pleurosternal muscle. Ritter (1911) did not note 

 its presence as distinct from his musculus latus. 



E. LEG MUSCLES (pi. i, fig. a). 



The muscles operating on the leg above the femur can be grouped 

 as shown in table 3. 



The tergal depressor of the trochanter muscle (C, 6; not present 

 in Anisopus, see elsewhere in this paper) could be added to the series 

 and thus classified as pertaining to the leg. 



Table 3. — Mesothoracic leg muscles of Anisopus (Group E in table i) 

 (C, 6, in table i) 



12. FURCOTROCHANTERAL 



13. COXOTROCHANTERAL 



a. 1st anterior levator of trochanter 



b. 2d anterior levator of trochanter 



c. Posterior levator of trochanter 



d. Anterior coxal depressor of trochanter 



e. Posterior coxal depressor of trochanter 



14. STERNOCOXAL 



a. Medial sternocoxal 



b. Posterior sternocoxal 



12. FURCOTROCHANTERAL DEPRESSOR OF TROCHANTER MUSCLE (PL. I, 

 FIG. a). 



Other names are : Sternal apophysis branch of extracoxal depressor 

 of trochanter (Snodgrass), sternal depressor of trochanter (Maki), 

 mesostemal branch of depressor of trochanter (Bonhag). 



A powerful muscle. The cryptosternum is deep and the furca well 

 developed. In Anisopus the muscle is large to compensate for the 

 absence of a tergal depressor of the trochanter. In Diptera possess- 

 ing both, they insert on the same tendon on the trochanter. Maki 

 (1938) mentions a pleural depressor of the trochanter in Ctcnacros- 

 celis (Tipulidae) ; he comments on the absence of "pleural levators" 

 of the trochanter in the same fly. I have found the latter but not 

 the former in Anisopus and such Tipulidae as I have examined; 

 I cannot help wondering if Maki (1938) made an observational error. 



Miller in Demerec (1950) did not find a sternal depressor of the 



