70 ILLINOIS BIOLOGICAL MONOGRAPHS 



EXPLANATION OF PLATE IX 



VENTRAL ASPECT OF THE HEAD 



Fig. 171. Gaslrolobium bicolor. 



Fig. 172. Creophilus viUosus. 



Fig. 173. Tachinus fimbriatus. 



Fig. 174. Akochara lata. 



Fig. 175. Pilopms lacuslris. 



Fig. 176. Fiistiger fttchsi. 



Fig. 177. LinuUodes paradoxus. 



Fig. 178. Sphaerius politus. 



Fig. 179. Scaphidium quadriguUatum. 



Fig. 180. Sphaeriles glabralus. 



Fig. 181. Hister tnemnonius. 



Fig. 182. Calopteron lerminale. 



Fig. 183. Photinus pyralis. 



Fig. 184. Phengodes plumosa. 



Fig. 185. Chauliognaihus pennsylvanicus . 



Fig. 186. ChaiUiognaihus pennsylvanicus, cross-section, showing invagination of gula. 



Fig. 187. Cantharis bilinealus. 



Fig. 188. Collops nigrkeps. 



Fig. 189. Trkhodes niUalli. 



Fig. 190. Necrobia rufipes. 



Fig. 191. Hylecoelus lugubris. 



Fig. 192. Micromalihus debilis. 



ad antacoila 



af antafossa 



an antacoria 



ccp cervepimeron 



CCS cervepisternum 



cct cervisternum 



ce compound eye 



ch chitinized area 



ea epicranial arm 



git gula 



guh gula bar 



in invagination 



inl line of invagination 



