NO, 2 THORACIC MUSCLES OF THE COCKROACH CARBONELL 21 



Fm, femur. 



Fs, furcasternum. 



Hd, head. 



///>, humeral plate. 



Ju, jugal region. 



m, first median plate. 



m', second median plate. 



Mer, meron. 



PIA, pleural arm. 



PIR, pleural ridge. 



SA, sternal arm. 



Sa, subalare, subalar plate. 



Spn, spina. iSpn, first spina ; 2Spn, second spina. 



T, tendon (used after the number of a muscle). 



Tg, tegula. 



Tn, trochantin (j Tn, first trochantinal plate; 2 Tn, second trochantinal plate). 



Tr, trochanter. 



EXPLANATION OF PLATES 



Plate i 



Fig. I. Right half of the prothorax, dorsal view. The right half of the head 

 can be seen in the upper part of the figure. The muscles appear as 

 they are seen when the pronotum is removed. 



2. Same. Some of the muscles which appear in the preceding figure have 



been removed to show the muscles underneath. 



3. Same, some muscles removed. 



4. Same. Right coxa, trochanter, and part of the femur are seen in the 



lower part of the figure. Some muscles removed. 



5. Same, some muscles removed. 



6. Same, some muscles removed. 



7. Same, some muscles removed. Posterior wall of coxa removed to show 



muscles inside. 



8. Same, some muscles removed in thorax and coxa. 



9. Same, some muscles removed. 



Plate 2 



Fig. id. Right half of the prothorax and right coxa seen from above. Some 

 muscles removed. 



11. Same, some muscles removed. 



12. Same, some muscles removed. 



13. Same, some muscles removed. 



14. Same, some muscles removed. 



15. Skeleton of the right side of the prothorax seen from above. The 



pronotum has been removed. Coxa, trochanter, and femur are seen 

 in the lower part of the figure. (See explanation of abbreviations.) 



16. Skeleton of the left side of the prothorax seen from below. 



17. Left half of the prothorax, mesal view. 



