Ghrysotoxum. 567 



female; they are more or less hairy, miich less in the female than in 

 the male; in the male the facets above are very slightly enlarged. 

 Vertex of moderate length. Frons somewhat prominent, with longish 

 hairs. Antennæ inserted well above the middle of the head; they 

 are elongate and porrected, the basal joints somewhat long, the third 

 elongate, linear, with the arista inserted near the base; the arista is 

 about as long as the third joint; the basal antennal joints have hairs 

 or small bristles, especially above and below, third joint and arista 

 microscopically hairy. Epistoma a little hoUowed between the an- 

 tennæ and the somewhat low central knob, below the knob it is 

 somewhat retreating; it is only a little protruding and not very de- 

 scending, the lower margin goes straight backwards to the jowls ; the 

 colour is yellow with a black middle stripe and with a black band 

 from the lower part of the eye down to the lateral oral margin; the 

 epistoma has erect hairs except on the middle stripe. Jowls some- 

 what broad, a little descending; they are somewhat separated from 

 epistoma by a furrow at the lower eye-corner. Proboscis and oral 

 cone of medium length. Glypeus with the basal part somewhat large, 

 triangularly incised in the anterior end. Labrum {cautum) is strong, 

 strongly semitubular and somewhat high at the base; the apical pro- 

 cesses are of equal length, the median cleft to the base, with spines 

 or emergences at the margin and at the apex; the upper lateral pro- 

 cesses are not very delicate, they are broad at the base, tapering and 

 pointed, somewhat irregularly serrated at the margin and divided 

 into some emergences at the apex; the lower lateral processes are 

 broad, of usual shape, with the lower or outer corner rounded, the 

 upper or inner corner angular ; the usual lateral rows of papillæ on 

 the inside of labrum are present and they are scattered on the whole 

 lower process; hypopharynx is as long as labrum, not very slender; 

 it is parallel-sided, semitubular, attenuated in the outer part, with the 

 apex rounded; the salivary duet is very distinct; the maxillæ are short, 

 not half so long as hypoprarynx; they are knife-shaped, somewhat 

 broad, and rounded at the end; they have the usual microscopical 

 spines, and these spines are relatively long and strong on the outer 

 side; the palpi are short, thread-like, a little longer than the lacinia, 

 with microscopical hairs and with long bristles in the whole length. 

 Labium with the basal part somewhat short, shorter than the broad, 

 oval labella. Thorax rectangular; scutellum with yellow margin, the 

 disc more or less black or blackish; there is no distinct fringe below 

 the margin. No thoracai or scutellar bristles present. Metapleura 

 with dense, short hairs. Abdomen rather arched, elongated oval, 

 sometimes more linear, broadest in the female ; it is distinctly marginate ; 



