438 NEW YORK STATE MUSEUM 



hence the yellow stripes separating theui 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 j-ellow; 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 heavilj* 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 rei)resenting 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.l]. 

 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 hypopharynx [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 

 Avith it, is the labium, with 11 blunt marginal teeth, the middle 

 one wide and broadl}' truncated. On the prothoracic 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.O, 12] ; dorsad of 

 which are two tufts of five or six bristles vixrh. Between the 

 prolegs and projecting caudad are four short blood gills. 



Pupa. The pupa is about 4^nim long, with the colors of the 

 adult. It is much shorter in comparison to its breadth than that 

 of Chironomus {srn.^. str.). The wings pxteud to little beyond 



