86 1LLIX0IS BIOLOGICAL MONOGRAPHS [256 



EXPLANATION OF PLATE 



Mandible and Maxillae 



Fig. 256b. Hypothetical mandible. 



Fig. 257. Hypothetical maxillae. 



Fig. 258. Simulium venustum, female, cephalic aspect. 



Fig. 259. Tabanus giganteus, female, caudal aspect. 



Fig. 260. Trichocera bimacula, caudal aspect. 



Fig. 261. Rhyphus punctatus, caudal aspect. 



Fig. 262. Dixa clavata, caudal aspect. 



Fig. 263. Psychoda albipennis, caudal aspect. 



Fig. 264. Bibio femoratus, caudal aspect. 



Fig. 265. Culicoides sangnisugus, female, caudal aspect. 



Fig. 266. Psorophora ciliata, female and male, caudal aspect. 



Fig. 267. Sciara varians, caudal aspect. 



Fig. 268. Rhabdophaga strobiloides, caudal aspect. 



Fig. 269. Bibiocephala clegantula, female, caudal aspect. 



Fig. 270. Chirononius fcrrugineovittatus, cephalic aspect. 



Fig. 271. My das clavatus, lateral aspect. 



Fig. 272. Platypcza vclutina, lateral aspect. 



Fig. 273. Stratiomyia apicula, cephalic aspect. 



Fig. 274. Empis clausa, lateral aspect. 



Fig. 275. Leptis vertcbrata, caudal aspect. 



Fig. 276. Proniachus vertebratus, caudal aspect. 



Fig. 277. Tipitla bicornis, portion of caudal aspect. 



Fig. 278. Aphiochaeta agarici, lateral aspect. 



Fig. 279. Pipunculus cingnlatus, lateral aspect. 



Fig. 280. Lonchoptcra lutea. 



Fig. 281. Psilocephala haeiuorrhoidalis, cephalic aspect. 



Fig. 282. Sccnopinus fenestralis. 



Fig. 283. Tabanus giganteus, male, caudal aspect. 



Fig. 284. Dolichopus bifractus. 



