394 NEW YORK STATE MUSEUM 
Appendages over the labrum lanceolate and four or five times: 
as long as wide, ventral comb of last segment with 21 hairs 
(HUrODCAR) eve. oo ciehe sca tae Sdn 2 bed oes wie fe een pallida 
4 “One of the four antennal bristles markedly shorter than the 
BOSC yobs Maas oo a SL ie el ete eke eee plumicornis (Hurope) 
The four antennal bristles of equal length; anal segment with 
four, dorsal Wairs? soo. aiscee'- 1s plumicornis, var. americana 
The larva of C. trivittata. described by Dyar in N. Y. Ent. Soc. 
Jour. 10:201 is said to have but 2 dorsal hairs on anal segment. 
Pupae 
“ Extraordinarily elongate abdomen which terminates in two 
paddlelike appendages, loosely ciliate outwardly”’..appendiculata 
Abdomen of moderate length, see figure; paddles with short cilia 
OW Che INE? NWHAPSINE < tare Sea ae oles oo We ee ees hare ee eee plumicornis 
Imagos 
1 Wings. with dark markings. o....3% os.a5d. ~uds.,b os soe eee (2): 
Wings ‘unmarked © occ ce. Se eck ee os os wie cw ereiee be =e cies ee (4). 
2 Wings with several cross bands. Length of insect 1.45mm.... 
Corethrella brakeleyt 
Wings with numerous dark Spots. . 2... ¢. 0.660.000 00 oie eee eee (8): 
3 The apex of both femora and the tibiae, and the base also of 
the tibiae, black, antennae with subfuscous hairs. Length 
A NINN TM cp oka Wfaib,'s: Ge gaye Bie, w less te VE evGie eie-0 chee ode cee eo ee ee trivitta ta 
Legs punctate with numerous small brown spots. Antennae 
WHEE aye OWS TIS oe oe Fe esi rak hewn gos tan see ante punectipennis 
4 Yellowish white species; legs white and spotless....... albipes QD. sp. 
Pale brown or reddish yellow species. ........... 0008. plumicornis 
Judging from the description, the larva of appendicu- 
lata differs greatly from all the known Corethra larvae, and 
I. Meinert in De eucephale Myggelarver says in regard to its pupa 
that the figure given by Herrick resembles that of a Chironomid 
rather than a Corethra. In the same paper Meinert expresses. 
the opinion that fusca is but a darker variety of plumi- 
cornis; and attributes the differences in the larva to an error 
of Staeger, assuming that the latter described some other 
species. 
Corethra appendiculata Herrick 
Minn. Geol. Nat. Hist. Sur. 1884. p.19, pl.5. 
The adult not bred. Larva as follows: 
Form is more slender than-plumicornis. The tracheal 
vessels are of a different form and color, and viscera have obvi- 
ous differences. . . Shape of the head is slender and attenu- 
ated toward insertion of the antennae. Antennae are shortish 
