266 Transactions. 
1. Wings with a network or fanlike a of creases, due 
to the folding of the wing in the a 2 
Wings without such creases, contracted but not folded over in 
the pupa Ков in Simuliidae EE 3 
. Ocelli, mouth-parts, and true venation a abse sen RC . DEU TEROPHLEBIIDAE. 
€ — D sud true venation presen ni . BLEPHAROCERIDAE. 
3. Ven very much reduced, the media entirely lacking . CECIDOMYIIDAE. 
Venation less reduced, at least one branch of the media re- 
ainin e - 
elli „ме 5 
Ocelli abse 13 
t ector forking far beyond { the radio- -median cross- -vein, 
at a 6 
Radial ee yos close t to or before the radio- median 
eross-vein (as in the Tipulid series) 11 E 
6. Antennae aid pem to the oral margin, below the compound > 
уе BIBIONIDAE. 
Antennae placed far from iud oral margin, at or above the 
middle of the сне жеше. 7 
7. Tibiae without dist ideni: tho orax without weil: сатке 
bristles differe were from the pubescen 8 
Tibial spurs well developed ; thorax any always with dis. 
ine ist] 
flie 
9o 
8 9 
es, the supra- -antennal portion of the eyes broad SCATOPSIDAE. 
Very pie a the eyes connected he: the antenn 
b ow bridge only IDOMYIIDAE, subfam.) LESTREMIINAE. 
i Antec "branch of adul sector little if any shorter than the 
long sector itself ? MYCETOPHILIDAE, subfam.) DrTOMYIINAE. 
Anterior ices à of radial sector short or eti (when aae: 
placed it is less than half as long as the se 
genera it is retracted towards the base of e emi "but 
is o> very short) 10 
. Coxae moderate ; eyes nearly always connected ‘above an- 
tennae ges a narrow bridge 
Coxae elongate ; зед Баргу ‘widely separate and at most 
slightly emargina . MYCETOPHILIDAE. 
11. Second anal (axillary) vein reaching t the e wing- -ma rgin ; 
notum with a well-marked suture (? AXISOPODIDAE, Subfam. ) TRICHOCERINAE. 
Sery ani v vein not reaching the wing-margin; mesonota 
e 
жип 
о 
. SCIARIDAE. 
ope 
bitus more or r less concave above . ANISOPO 
Lower branch of cubitus convex above ? MYCETOPHILIDAE, witha ) "Pica. 
NEURINAE 
. Two anal veins distinctly rer NN ee meso- 
notum with complete V-shaped s 
At. most one anal vein reaching ihe e wing margin $ ` mesonotal 
— 
bo 
а 
@ е+ 
"1 
H 
2 
e 
Е 
S 
= 
= 
e 
'TIPULIDAE. 
ga oe pec indisti ame Or ied sent 14 
14. First antennal segment well developed, generally longer than 
the ud which i is not спасао enlarged . 15 
antennal segment reduced to rrOW ring or absent, 
the second much enlar, 18 
15. Wings very broad, the venation much reduced, media and 
cubitus fainter than the radi ULIIDAE. 
Wings with the аса less reduced, all > veins equally stro ng 16 
16. Anal vein very short or absent; sma. , densely hairy flies .. PSYCHODIDAE. 
Anal vein long, reac hing to middle of wing or му: la argo, 
comparatively bare, long-legged flies 17 | 
Pu — five-branched, media three- branched ; ; no fold con- Bi 
ecting the дойт: vein with Cu, TANYDERIDAE. 
Radius bucks. ched, media two- branched or simple ; ; a fold 
connecting the anal vein with Cu, Er . PTYCHOPTERIDAE. 
18. Venation | little reduced, radius four-branched Ar 19 
Venation more reduced, radius at most three-branched © .. 20 
19. Veins and wing-margin wi e д only; R,,4 arched 
and forming: os m with the se IXIDAE. 
Veins and wing-margin fringed with long scales ; Rats 
straight and generally continuous with the secto . CULICIDAE. 
