11 TABLE OF CONTENTS. 



Page 



tabanim:, 213 



Pangonia hera n. sp. California 214 



Silvius gigantulus Loew. California; Colorado. .... 215 



Tabanus procyon n. sp. California. . . . . . . 216 



" sonomensis n. sp. California. . . . • . .216 



" phsenops n. sp. California 217 



" rhombicus O. S. Colorado 218 



" insuetus n. sp. California. 219 



" Eegrotus n. sp. California 219 



Chrysops noctifer n. sp. California. 220 



" fulvaster n. sp. Utah ; Colorado. 221 



" proclivis n. sp. California 222 



" surdus n. sp. California 223 



LEPTID^E, 223 



Chrysopila hurnilis Loew. California. 223 



Symphoromyia n. sp. . . . . . . . . . 224 



NEMESTRINID^E, 224 



Hirmoneura clausa n. sp. Texas . 225 



bombylim;, 225 



Analytical table of the genera, 228 



Exoprosopa, Analytical table of the species, 230 



Exoprosopa sima n. sp. Nevada . . . 230 



" dorcadion n. sp. Atlantic States and California. . .230 



" caliptera Say. Colorado 233 



" titubans n. sp. Colorado. 233 



" dodrans n. sp. Colorado 234 



" doris n. sp. Nevada 235 



" eremita n. sp. California 236 



Dipalta nov. gen. 236 



Dipalta serpentina n. sp. Colorado; California 237 



Anthrax, Synopsis of the species, 238 



Anthrax alpha n. sp. California ; Colorado. 239 



Hemipenthes, 241 



Argyramceba, Synopsis of the species, 241 



Argyramoeba Pluto Wied. Atlantic States. 244 



" fur n. sp. Texas 244 



Triodites nov. gen 245 



Triodites mus n. sp. California ; Utah 246 



Oncodocera, 247 



Bombylius, Synopsis of the species, 247 



Bombylius major Lin. California 248 



" metopium n. sp. California 249 



" aurifer n. sp. California 249 



" cachinnans n sp. California 249 



" lancifer n. sp. California 251 



Anastcechus nov. gen 251 



Anastoechus barbatus n. sp. Wyoming; Colorado 251 



Systceehus oreas n. sp. California 254 



