DIP TER A. 
423 
C, Antennae consisting of more than five distinct segments, the 
segments beyond the second not consolidated; cell VIII of 
the wings but slightly narrowed at the margin of the wing, if 
at all; palpi usually elongate, and composed of from three to 
five segments. 
D. Small moth-like flies, with the body and wings densely 
clothed with hairs and scales. Wings with from nine to 
eleven longitudinal veins, but with no cross-veins except 
sometimes near the base of the wings (Fig. 500). p. 428. 
PSYCHODIDjE. 
DD. Flies that do not resemble moths in appearance. 
E. Dorsum of thorax with a distinct V-shaped suture (Fig. 
503). p. 429 .TlPULIDiE. 
EE. Dorsum of thorax without a distinct V-shaped suture. 
F. Vein V of the wings three-branched; cell V a divided 
by a cross-vein (Fig. 527). p. 448.RhyphiDjE. 
FF. Vein V of the wings simple or two-branched ; cell V, 
not divided by a cross-vein. 
G. Wings with a network of fine lines near the outer 
and inner margins in addition to the veins (Fig. 506). 
p. 432. ... BLEPHAROCERIDiE. 
GG. Wings without a network of fine lines. 
H. The margin of the wings and each of the wing- 
veins fringed with scales (Fig. 512). p. 437. 
CulicidjE. 
HH. The wing-veins with or without a fringe of hairs, 
but without a fringe of flat scales. 
I. Anal veins entirely wanting; vein V wanting or 
at most represented by a single unbranched fold 
(Fig. 522). p. 444. CECIDOMYIIDiE. 
II. Anal veins present or represented by folds ; vein 
V present or at least represented by a fold which 
is usually branched. 
J. Ocelli present. 
K. Antennae shorter than the thorax; legs 
comparatively short and stout; coxae not un¬ 
usually long. p.449. BlBIONIDiE. 
KK. Antennae usually longer than the thorax ; 
legs slender, and with greatly elongate coxae 
(Fig. 518). p.442. MYCETOPHILIDiE. 
JJ. Ocelli absent. 
K. Antennae short, not clothed with long hairs, 
