m. Conjunctiva of the ventral sclerites of the abdomen present, frequently well developed, surrounding the sclerites. n. Mouth parts vestigial. OESTRIDÆ. See page 297 for generic synopsis. nn. Mouth parts well developed. o. M_{1+2} straight, hence cell R_5 wide open in the margin; costa ending at the tip of R_5; three sternopleurals present; antennal arista plumose. _Syllegoptera_. Europe. (SYLLEGOPTERINÆ). DEXIIDÆ in part oo. M_{1+2} bent, hence cell R_5 narrowed in the margin; sternopleurals rarely wanting, usually 1:1 or 0:1; facial plate strongly produced below vibrissal angle like the bridge of the nose; antennal arista bare. Parasitic on Hemiptera and Coleoptera. _Allophora_, _Cistogaster_, _Clytia_, _Phasia_, etc. (PHASIINÆ) TACHINIDÆ in part. mm. Conjunctiva of the ventral sclerites invisible (fig. 161a). n. Second ventral sclerite of the abdomen lying with its edges either upon or in contact with the ventral edges of the corresponding dorsal sclerite. o. Outermost posthumeral almost always lower (more ventrad) in position than the presutural macrochæta; fifth ventral abdominal sclerite of the male cleft beyond the middle, often strongly developed; body color very frequently metallic green or blue, or yellow; arista plumose. (CALLIPHORINÆ) MUSCIDÆ in part. See page 303 for generic synopsis. oo. Outermost posthumeral macrochæta on level or higher (more dorsad) than the presutural macrochæta; arista bare, pubescent, or plumose only on the basal two-thirds; body coloring usually grayish (fig. 106). SARCOPHAGIDÆ