438 NEW YORK STATE MUSEUM 
hence the yellow stripes separating them and those on the 
humeri, more conspicuous. Pectus, scutellum, and a little space 
in front of the latter, brown; the pectus in dried specimens 
sometimes nearly black; pleura yellow, metanotum black; abdo- 
men.as with the male, but the venter paler, legs black, coxae 
and base of femora yellow; tarsal claws simple; wings hyaline, 
anterior margin and tip a little smoky; anterior veins yellow; 
wing margins delicately ciliate; venation as with the male; 
halteres white. Length 3 to 5 mm. 
Larva. The eggs I did not find. The larva is 8 to 10mm in 
length when full grown, pale or yellowish green in color, its 
head dark brown and heavily chitinized. The head is somewhat — 
longer than wide, the dorsal suture well marked, and with a 
few setae arranged as in figure 4. . Two setae are placed immed- 
iately in front of the transverse suture, and at the apical end 
of the labrum are two more [fig.4]. A ventral view of the 
labrum is given in figure 3; e representing the epipharynx to 
which perhaps belongs also the two lateral pieces with their 
pointed processes. The anterior margin is furnished with a 
number of small fleshy lobes. The antennae are small, the 
basal joints about four times as long as wide, with two terminal 
pieces, one of which is four jointed, the other simple [fig.1]. 
The mandibles |[fig.2] are about twice as long as broad, heavily 
chitinized, and with five short, blunt terminal teeth; articulated ~ 
at the base of each is a long slender piece, with four terminal 
spines. This is shown folded down in the figure. The maxillae 
are short protuberances, covered with pointed processes; a very 
short palpus with terminal papillae, and two stout setae pro- 
jecting ventrad. The bhypopharynx [fig.5] is tonguelike, with 
two long basal pieces. Its apex and its dorsal surface are 
covered with pointed papillae; ventrally, there is an open arched 
rib. At the cephalic end of the ventral sclerite and coalescent 
with it, is the labium, with 11 blunt marginal teeth, the middle 
one wide and broadly truncated. On the prothoracie segment 
are the two prolegs, each with about 30 long, curved spines, and 
a number of small and very short spines on the ventral surface. — 
At the base is a single slender seta, on each side a little dorsad 
of the lateral line are two more, and caudad of these and below ~ 
the lateral line a group of three. The 11th segment is without 
blood gills; the 12th with two comparatively short legs, each 
with a crown of eight to 10 bifid claws [fig.9, 12]; dorsad of 
which are two tufts of five or six bristles each. Between the 
prolegs and projecting caudad are four short blood gills. 
Pupa. The pupa is about 43mm long, with the colors of the 
adult. It is much shorter in comparison to its breadth than that 
of Chironomus (sens. str.). The wings extend to little beyond 
