r. Abdomen petiolate. _Dibezzia_ Kieff. rr. Abdomen not petiolate. s. Head semi-globose; hind tarsi unusually elongate in the female; antennæ of the male not plumose. Europe. _Macropeza_ Meigen. ss. Head not globose, more or less flattened in front; antennæ of the male plumose. Widely distributed. _Bezzia_ Kieff. t. Fore femora, at least, armed with stout spines below. Subgenus _Bezzia_ Kieff. tt. Femora unarmed. Subgenus _Probezzia_ Kieff. ii. Media of the wing simple, and otherwise not as in "i". To this group belong numerous Chironomid genera, none of which are known to be noxious to man. ff. The costal vein apparently is continued around the hind margin of the wing; radius with at least four branches. g. Wing ovate pointed, with numerous veins; crossveins, if evident, before the basal third of the wing; veins very hairy; very small moth-like flies. PSYCHODIDÆ h. With elongate biting proboscis; the petiole of the anterior forked cell of the wing (R_2) arises at or beyond the middle of the wing (fig. 163d). PHLEBOTOMUS Rdi. [Illustration: 163. Wings of Diptera. (_a_) Anopheles; (_b_) Prosimulium; (_c_) Johannseniella; (_d_) Phlebotomus (After Doerr and Russ); (_e_) Tersesthes (after Townsend); (_f_) Tabanus; (_g_) Symphoromyia; (_h_) Aphiochæta; (_i_) Eristalis; (_j_) Gastrophilus; (_k_) Fannia; (_l_) Musca.] hh. With shorter proboscis; the petiole of the anterior forked cell arises near the base of the wing. _Psychoda_, _Pericoma_, etc. gg. The r-m crossvein placed at or beyond the center of the wing; wings not folded roof-like over the abdomen. h. Proboscis short, not adapted for piercing; wings bare (DIXIDÆ); or wings scaled (CULICIDÆ, Subf. CORETHRINÆ). hh. Proboscis elongate, adapted for piercing; wings scaled, fringed on the hind margin; antennæ of the male bushy plumose. Mosquitoes. CULICIDÆ (exclusive of CORETHRINÆ) i. Metanotum without setæ.