112 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IO3 



easily be identified by comparison in the male (fig. 29 B), though the 

 muscles of the male are much larger and the second and third laterals 

 are not crossed. 



/jj, 144, 755, 7(5(5. Median internal dorsal muscles of abdominal 

 segments III to VI (fig. 28 A). 



1^4, 14J, ij6, 16/. Lateral internal dorsal muscles of abdominal 

 segments III to VI (fig. 28 A). 



1^5, 146, 157, 168. External dorsal muscles of abdominal segments 

 III to VI (fig. 28 A). — Oblique in anterior segments, reversed in 

 posterior segments; origins posteriorly on anterior tergum, insertion 

 anterior on anterior apodeme of posterior tergum. 



1^6, 142, 138, i6g. Occlusors of the spiracles of abdominal seg- 

 ments III to VI (not shown in figures). 



J^y, 148, Jjp, I/O. Dilators of the spiracles of abdominal segments 

 III to VI (fig. 28 A). — Origins on long lateral apodemes of the sterna. 



1^8, 14P, 160, iji. First lateral mscles of abdominal segments III 

 to VI (figs. 26 D, 28 A). — Reversed tergosternal muscles arising 

 ventrally on lower parts of terga, inserted dorsally on lateral apodemes 

 of corresponding sterna. 



J^p, 150, 161, ij2. Second lateral muscles of abdominal segments 

 III to VI (fig. 28 A). — External tergosternal muscles attached 

 ventrally on lateral margins of the sterna; dorsoventral in the male 

 (figs. 26 E, 29 B), oblique in the female (fig. 28 A). 



140, i^i, 162, 77J. Third lateral muscles of abdominal segfnents III 

 to VI (fig. 28 A). — Internal tergosternal muscles attached ventrally 

 in posterolateral angles of dorsal surfaces of sternal plates (fig. 26 E), 

 parallel with second laterals in the male (figs. 26 E, 29 B), crossing 

 the latter obliquely in the female (fig. 28 A). 



7^7^ i§2, 16^, 1/4. Median interttal ventral muscles of abdominal 

 segments III to VI (fig. 28 A, B). — In each segment the median 

 ventrals form a V with the convergent ends posterior (B) ; in the male 

 these muscles are wide bands of fibers. 



142, 75J, 164, 775. Lateral internal ventral muscles of abdominal 

 segments III to VI (fig. 28 A, B). — The lateral ventrals are oblique 

 in an opposite direction from the median ventrals, the two sets form- 

 ing in each segment an M. 



14^, 1^4, 165, iy6. External ventral muscles of abdominal segments 

 III to VI (fig. 28 A). — Short reversed muscles from posterior parts 

 of sterna to under surfaces of anterior apodemes of preceding sterna. 



The musculature of abdominal segments VII to IX is unlike in the 

 two sexes, in some cases also between queen and worker, and differs 

 from that of the preceding segments by the absence of certain muscles 



