Cerioides. 587 



out, especially above and below. The eyes touching in the male, 

 separated in the female; they are bare; in the male the facets are 

 distinctly enlarged above towards the suture. Frons somewhat pro- 

 truding, and the protruding part may be prolonged to a long, styli- 

 form process, bearing the antennæ (f. inst. in the Danish species) ; the 

 frons has exceedingly short hairs, the prominent style is bare. Antennæ 

 inserted well above the middle of the head, quite near to each other, 

 and there is no visible lunula above them ; they are elongate and 

 porrected, first joint long, styliform, the second and third form together 

 a spindle-shaped body, bearing at the apex a short, conical, pointed 

 style; the two basal antennal joints have small hairs, the third and 

 the style are microscopically hairy. Epistoma is about straight down- 

 wards, quite below with a small central knob just above the mouth 

 edge; it is slightly protruding below but considerably descending; it 

 is yellow with the middle stripe and lower lateral parts black, and it 

 is bare. The jowls are broad and very descending, at the lower eye- 

 margin they have a curious impression, and from here a slight furrow 

 stretches a little upwards just along the eye-margin. Glypeus is deeply 

 incised in front. Proboscis of medium length ; palpi thread-like, slightly 

 clubbed ; I have otherwise not examined the mouth parts. Thorax 

 rectangular; scutellum black and yellow (or, in foreign species, quite 

 yellow), with no marginal fringe below. Metapleura with very short, 

 dense hairs. There are no thoracai or scutellar bristles. Abdomen 

 somewhat narrow and elongated, rather arched and cylindrical, though 

 flat below; sometimes it is narrower at the base and clubbed; the 

 flrst segment is not quite short ; in the male there are four not trans- 

 formed segments, the fourth segment is the longest on the dorsal side, 

 but downwards its hind margin curves evenly forwards so that at the 

 side margin it is much shorter than above; the fourth ventral segment 

 is just as long as the side margins of the dorsal, it is slightly and 

 roundly incised in the hind margin. The genitalia are large, especi- 

 ally the eighth segment forms a very large knob at the end of ab- 

 domen; in the female the abdomen has five visible segments, the fifth 

 the smallest, the rest are hidden, the last has two lamellæ. Legs 

 somewhat long; hind femora somewhat dilated and curved in the 

 male, but not or almost not in the female; they are armed with short 

 spinules below; the legs are short-haired. Glaws and pulvilli well 

 developed; empodium thin, spine- or bristle-shaped, hairy. Wings with 

 the radial vein curved upwards from the base of the cubital vein ; the 

 cubital vein curved more or less down in the first posterior cell (in 

 the Danish species rather much), the curve is angular below and 

 from the angle a veinlet goes perpendicularly downwards; the medial 



