THE CANADIAN ENTOMOLOGIST 153 



2. The episternuni, epimeron and entopleural ridge can be easily dis- 

 tinguished though in most cases greatly modified. 



3. The pleural sclerites have probably persisted because of their muscular 

 attachments. 



4. The musculature of the propleuron is similar to that of the mesopleuron 

 and metapleuron. 



5. The sulci are integumental folds formed by mechanical stress due to 

 (a) the pulling of the head and mesothorax against the pronotum, (b) the in 

 folding of the pleural suture, and (c) the pull of the prothoracic muscles at- 

 tached to them. 



Reference Lettering. 



cox. coxa. Muscles. 



epm. epimeron. 4. Elevator of head, 



entp. entopleurite. 5. Retractor of head, 



ents. entosternite. 6, 7, 8. Rotators of head, 



est. episternum. 19, 20, XIX. Retractors of the pro- 



F. fold in sutural membrane. notum. 



H. base of head. 22, 26, 27, 42, 43. Extensors of the 



pcx. precoxale. coxa. 



s. su. sternal sulcus. 23. Flexor of the coxa, 



su. sulcus. 25, 2.5a, 40a. Extensors of the femur, 



tn. trochantin, 44. Depressor of the wing, 



tr. trochanter. 



vc. veracervix. 



Explanation of Figures. 



Fig. 1. External view of the pronotum and propleuron of Rhomalea micrq- 

 ptera . 

 ''' 2. Internal view of same. 



''' 3. Internal view of pronotum and propleuron of Dissosteira Carolina. 

 " 4. External view of pronotum and propleuron of Tettix granulatus. 

 ''' 5. Internal view of same. 



«« 



'' 6. Internal view of pronotum and propleuron of Conocephalus. 



:' 7. Same of Microcentrum. 



" 8. Same of Ceulhophitus maculatus. 



'' 9. Same of Gryllus pennsylvanicus . 



?' 10. Anterior view of detached propleuron of G. pennsylvanicus. 



' 11. Internal view of pronotum and propleuron of Oecanthus nigricornis. 



' 12. Musculature of the propleuron and pronotal sulci of Rhomalea micro- 

 ptera . 



13. Musculature of pro- and mesopleuron of Gryllus pennsylvanicus. 



tU 



Change of Name. — ^Prof. R. W. Dawson, of Lincoln, Neb., who is making 

 a special study of the genus Serica informs me that my Serica carinata (Cole- 

 optera of Indiana, 1910, p. 950) is preoccupied by Serica carinata Burmeister 

 (Handbuch IV, 2, p. 175). I, therefore, propose for my Indiana species the 

 name Serica evidens, sp. nov. 



W. S. Blatchley. 



