ILLISOIS BIOLOGICAL MOXOGRAPHS 



[94 



EXPLANATION OF PLATE XXI 



LATERAL ASPECT OF THX BEAD 



Fig. 436. 



Fig. 437. 

 Fig. 438. 

 Fig. 439. 

 Fig. 440. 

 Fig. 441. 

 Fig. 442. 



Fig. 443. 

 Fig. 444. 

 Fig. 445. 

 Fig. 446. 

 Fig. 447. 

 Fig. 448. 

 Fig. 449. 

 Fig. 450. 

 Fig. 451. 

 Fig. 452. 

 Fig. 453. 

 Fig. 454. 

 Fig. 455. 

 Fig. 456. 

 Fig. 457. 



"f 

 av 

 ccp 



Epicaerus imbrkatus. 

 Lixus fimbriolalus. 

 Thecesternus liumeralis. 

 Splt€ttopliorits aequalis. 

 Platypus flavkornis. 

 Scolyttis quadrispinosus. 

 Dendroclonus valens. 



ENDOSKELETON OF THE HEAD 



HN-potlietical t>-pe. 

 Telracha Carolina. 

 Ckindda formosa. 

 Calosoma calidwn. 

 Harpalus erratkus. 

 A mphizoa lecontei. 

 Omophron amerkanum. 

 Pdiodyks IZ-punclala. 

 Cyhister fimbrwlatiis. 

 Dineulcs amerkanus. 

 Hydracna marginkollis. 

 Hydroscapha na-tans. 

 Hydrous triangularis. 

 Hydrophilits oblusaJus. 

 Plalypsyllus castoris. 



antafossa 



antacava 



cen'epimeron 



cervepistemuin 



compound eye 



cl\-pealia 



corpotentorium 



epicranial ann 



invagination 



labnim 



laminatentorium 



