Boe NEW YORK STATE MUSEUM 
Convex, oval; breathing tubes composed 
of several lamellae. o..6 c2% sau aoe eee oe Blepharoceridae 
7 Prothoracie respiratory appendages sim- 
ple, slender, antennaelike; pupa slug- 
fish’ or, MOLIONIESS: <fg.-9r o.-'- eo (8) 
Prothoracic appendages short and pointed, 
or club shaped, or composed of numer- 
ous fine filaments, or entirely want- 
INO ah Aa oN Saco re APR ER GAO aos ere (9) 
8 First abdominal segment about as long as 
EWOSE- POM OWI 2 Aol a crete was ce = et heieys ecorstage Some Psychodidae 
First abdominal segment about half as 
long as. those followaiite ile. <2: <n. ss i. Nis,2s ae See Tipulidae 
9 Prothoracic appendages short and pointed............. Rhyphidae 
These appendages not as above...... (10) 
10 With two rounded paddlelike appendages . 
at the caudal end.). Pupa.active..s: . 2% -..4 4. +. 0a. eee Culicidae 
Without distinct paddles (if present, then 
pointed, and with ciliate margin)...(11) 
11 The caudal end with two pointed pro- ; 
cesses and usually bent forward over . 
the pectus; the pupa resting on its side. ...° ..-.- 2s see Dixidae. 
Prothoracic appendages either many . 
branched, simple or apparently want- 
ing, the pupa in the larval tube (Chi- 
ronomus) or active, Culexlike (Tany- 
pus); or floating nearly motionless 
(Ceratopopon)” ccm bc cok aah tae Semmenieee . Chironomidae 
The above keys are modifications of those given by Mr C. A. Hart, 
Illinois State Lab. Nat. Hist. Bul. 1895. v.4, art.6, p.186-89. 
To determine the imagines, the reader is referred to Comstock’s Manuat 
for the Study of Insects, or to Williston’s Manual of the North American 
Diptera. 
Family BLEPHAROCERIDAE 
Net-winged midges 
These flies are of moderate size, elongate and bare, with long 
legs and broad wings. The ocelli are present; the proboscis is 
elongated; the antennae are slender, composed of from six to 
16 joints, clothed with short pubescence. The thorax has a 
distinct though interrupted suture. The empodium is very 
small and the pulvilli are wanting. The wings are broad, with- 
out hair, with a projecting anal angle; characterized by a net- 
work of fine lines which extend in various directions and not 
1Corethrella (q. v.) is an exception: having two pointed caudal lobes. 
