4. NEMOTELUS 123 



then becomes a more or less triangular black space with a small white spot 

 left on the middle of the third hindmargin ; also the yellow sidemargin on 

 the fourth segment may be extremely narrow, and may be missing on the 

 fifth segment ; pubescence universal, but rather sparse and inconspicuous, 

 depressed, pale yellow. Belly black with all the disc of the three basal 

 segments broadly yellowish white, but least so on the basal segment and some- 

 times only narrowly on the foremargin of the third segment ; the absolute 

 sidemargins are all yellow though the sides of the belly are black and 

 sometimes the hindmargins of the fourth and fifth segments are yellow : the 

 black sides of the belly generally extend out on to the disc near the hind- 

 margin of the third segment but leave all the actual hindmargin of that 

 segment yellow, and sometimes the black sides extend out a little on the 

 middle of the second segment. Genitalia with yellowish lamellae in the 

 middle, but with two narrow black spines outside them and two others 

 ventrally. 



Legs black and yellow ; femora shining black except for the broad yellow 

 tip ; anterior tibiae orange, with sometimes a slight darkening just below the 

 middle, and sometimes with a distinct blackish postero-dorsal streak there on 

 the front tibiae ; hind tibial black, with the basal quarter and just the tip 

 orange. Pubescence fairly obvious, especially on the cox^ and on a moderately 

 long fringe behind the anterior femora, all pale yellow. 



Wings glassy hyaline, with very faint veins except for the distinct yellow 

 veins on the forepart of the wing which extend from the base to the basal part 

 of the discal cell and thence on to the end of the cubital vein. Squamae clear 

 pale yellow with whitish fringes, the thoracal pair forming a short broad 

 rather circular lobe with a long pretty fringe. Halteres clear yellowish white, 

 with the base of the stem a little darkened. 



$ . Very different from the male. Face produced rather less than the length of 

 the eye (in profile) ; frons shining black, with a pair of small narrow elongate 

 yellowish (white to orange) spots (sometimes very small and obscure) which 

 extend from the eyemargins just above the antennae across the outer quarters 

 of the frons but which slope rather forwards. Pubescence on the frons 

 moderate and pale (golden to greyish white) except on the bare transverse 

 suture near the antennae, while below the pale spots it is more abundant on the 

 sides but becomes sparse towards the upper part and tip of the snout ; back 

 of the head inflated (though less than in N. jiantherinus), and bearing dense 

 yellow or whitish adpressed short pubescence which slopes forwards and 

 upwards. Eyes so small that the frons between them occupies more than 

 one-third the width of the head. Antennae placed slightly beyond the middle 

 of the snout. 



Thorax and scutellum shining black, finely but not very densely punctate. 

 Pubescence shorter than in the male but (in good specimens) fairly dense and 

 brownish yellow ; metanotum also bearing a little golden to greyish white 

 pubescence on its disc. 



Abdomen shining black, with small orange or pale yellow markings which 

 consist of very narrow sidemargins (normally) connecting across the hind- 

 margins of the fourth and fifth segments and extending inwards along the 

 hindmargins of the other segments, but leaving a small triangulai" isolated 

 orange or yellow spot at the middle of each of these segments ; usually this 

 spot on the second segment is widely isolated, while the one on the third 

 segment is approached by the lateral spots ; but these pale markings vary to 

 a certain extent, so that the spot on the second segment may be barely isolated 

 or the line on the hindmargin of the fourth segment may break up into three 

 long flattish spots, or the side stripes on the hindmargins may be cut off from 

 the sidemargins and in their turn cause each hindmargin to bear three isolated 

 spots ; pubescence scattered, yellow, longer and more obvious on the end 

 segments. Belly shining black, with nearly the middle half of the second 

 segment occupied by a large yellow spot which sometimes extends up the 

 middle of the basal segment, and sometimes there is a yellow triangle or a 

 long narrow yellow stripe on the middle of the hindmargin of the third and 

 fourth segments, while the sixth segment may have an arched spot on the 

 middle of its hindmargin ; sidemargins all yellow ; pubescence very short, 



