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True Flies — Part 5

Style of antennae, when present, much narrower than the third antennal joint, fourth vein ending below the wing tip . . . . . Family Bombyliidae.

24--Discal cell wanting or coalescing with one of the other cells, fourth vein coalescing with the fifth for a considerable distance, or the wings having two longitudinal and three or four oblique veins issuing from the second (Super-family Phoroidea) . . . . . 29

Discal cell usually present, fourth vein not coalescing with the fifth, wings provided with more than two longitudinal veins (Super-family Asiloidea) . . . . . 25

Super-family ASILOIDEA Coq.

25--Apex of the third vein usually situated below the extreme tip of the wing, body sometimes metallic green or bluish: . . . . . 26

Apex of the third vein situated at or above the tip of the wing, body never metallic green or bluish, proboscis furnished with terminal lips, anal cell much longer than the second basal, three posterior cells present, third vein forked, antennae not furnished with a style or arista . . . . . Family Scenopinidae.

26--With five posterior cells in each wing, anal cell always present and much longer than the second basal, third vein always forked . . . . . 27

With less than five posterior cells, anal cell sometimes wanting; when present it is shorter or only slightly longer than the second basal cell . . . . . 28

27--Proboscis furnished with terminal lips, face strongly retreating on its lower part, not bristly . . . . . Family Therevidae.

Proboscis sharp-pointed, not provided with terminal lips. face projecting forward or convex on its lower part, provided with strong bristles or long hairs . . . . . Family Asilidae.

28--Second basal cell, when confluent with the discal, the color of the body is never metallic green, anal cell sometimes wanting, third vein sometimes forked . . . . . Family Empidae.

Second basal cell confluent with the discal, anal cell always present, third vein never forked, color of body usually metallic green . . . . . Family Dolichopodidae.

Super-family PHOROIDEA Coq.

29--Wings furnished with more than two longitudinal veins, fourth vein coalescing with the fifth beyond the apex of the second basal cell, then separating into three branches, axillary lobe and cell wanting, anal cell very narrow . . . . . Family Lonchopteridae.

Wings furnished with two longitudinal veins, situated near the costa, the second vein sending three or four indistinct veins obliquely toward the posterior margin of the wing . . . . . Family Phoridae.

Section CYCLORHAPHA Brauer.

30--Anal cell present, distinctly longer than the second basal, the discal cell sometimes wanting, both basal cells usually present (Super-family Syrphoidea) . . . . . 31

Anal cell, when present, shorter than the second basal, but one or both of these cells frequently wanting (Super-family Muscoidea) . . . . . 34

Super-family SYRPHOIDEA Coq.

31--Proboscis short and robust, no supernumary vein between the third and fourth veins . . . . . 32

Proboscis slender and elongate or the wings provided with supernumary vein between the third and fourth veins . . . . . 33

32--Head less than one-half as long as the thorax, the face and front broad . . . . . Family Platypezidae.

Head unusually large, nearly as long as the thorax, except on the occiput almost wholly covered by the eyes . . . . . Family Pipunculidae.

33--With a supernumary vein between the third and fourth veins, crossing the small cross-vein, the proboscis usually short and robust . . . . . Family Syrphidae.

With no supernumary vein, the proboscis very slender and elongate . . . . . Family Conopidae.

Super-family MUSCOIDEA Coq.

34--Lower, or posterior, calypter distinct, usually projecting beyond the upper (Group Calypteratae) . . . . . 35

Lower calypter minute or wanting, eyes broadly separated in both sexes (Group Acalypterae)

Group CALYPTERATAE Desv.

35--Oral opening large, the proboscis well developed

Oral opening very small, the proboscis and palpi rudimentary, the antennae very short and somewhat concealed in cavities; rather large, robust flies. . . . .Family Oestridae.

36--Pleura bearing a perpendicular row of bristles above the posterior coxae.

Pleura not bearing such a row of bristles, those of the abdomen weak.

37--Antennal arista hairy or plumose, at least on the basal portion.

Antennal arista bare or pubescent. . . . .Family Tachinidae.

38--Arista of antennae hairy nearly or quite to the apex, legs usually very long, abdomen provided with stout bristles

Arista bare on its broad apical portion or the bristles of the abdomen weak, legs short and robust.

39--Fourth vein before its apex strongly curving toward the third