396 NEW YORK STATE MUSEUM 



or less distinctly visible on each segment. The hypopygium con- 

 sists of two jointed hooks, is pale brown in color, nearly as long 

 as an abdominal segment [lig.8]. ^'enter and the legs are. pale 

 yellow, the last two or three tarsal joints slightly infuscated. 

 Legs and abdomen densely but delicately haired; wings yellow- 

 ish, the veins scarcely dark; venation as in iigure 10; halteres- 

 pure white. Length 5^-mm. 



Female. Differs from the male in the following particulars- 

 Antennae entirely yellow, basal joint, palpi and upper, surface- 

 of proboscis with a tinge of brown; frontal spot brown; scutel- 

 lum with a fine median line and its posterior margin pale yel- 

 low; abdomen yellow, dorsal surface with a tinge of brown,, 

 specially on the posterior margin. The two little white spots- 

 with pale brown margins also present on each segment. Anal 

 segment brown, genitalia yellow, venter, legs, halteres etc. as. 

 with the male. Wings as in figure 9. Leng-th 5mm. Described 

 from alcoholic specimens. New Jersey, Illinois, New York, Min- 

 nesota. 



Larva differs from Meinerts description [loc. cit.] of the Euro- 

 pean plumicornis in the following particulars. The four 

 long bristles of the antennae are of equal length, while in the- 

 PJuropean form one is distinctly shorter than the rest; the head 

 in all alcoholic specimens is more sharply constricted from the- 

 thorax. In Weissmann's figure the spines of the antennae are 

 shown of equal length. 



The larva is colorless, in alcoholic specimens pure white; the- 

 large eyes, the pair of air sacs in the thorax and in the seventh 

 abdominal segment are black and the tips of the mandibles- 

 brown. The head is somewhat elongate, subcorneal, the antennae 

 pendant [flg.4a], each with four long bristles of equal length- 

 Caudad of these are 10 filaments, five on each side of the median 

 line [flg.4&] ; these are the filaments of the third metamere of 

 Meinert. Then comes the pair of leaflike appendages, ap- 

 pendages of the third metamere of Meinert, [flg.4c] ; following, 

 which is the labrum. 



The labrum [flg.4Z] is an elongate fleshy, flngerlike process, ter- 

 minating in several tufts of hair. The two ventral tufts each with 

 from 20 to 25 coarse hairs. At the base and somewhat cephalad 

 of the mandibles [fig.4m] are the fans [f] each consisting of 

 from 18 to 22 long, coarse hairs. The mandibles [m] have 

 four or five teeth, two stout spines anteriorly, and a serrate 

 posterior margin. Closing in the lateral posterior margin of 

 the mo'uth are the maxillae [fig.a?] ; fieshy lobes, each with a 

 long, jointed appendage anteriorly and two short stout spines. 

 At the posterior border of the mouth is the labium [I] with 



