S64 LEPTID^ 



third joint as long as tlie two basal joints together, subtriangular, and bearing 

 a few short black dorsal bristles about the base, and otherwise bearing minute 

 soft pale pubescence ; arista springing from the point of the third joint, long 

 and thin, being about twice as long as the antennte, practically bare and 

 slightly tapering, obscurely blackish, and in no way geniculate though 

 obviously upturned. 



Thorax dull ashy grey, with three broad Ijlackish stripes of which the 

 middle stripe is often narrowly split ; humeri dull orange or with only a 

 slight orange tinge, and the triangular space between the humeri and the 

 mesopleuraj also orange, Avhile a more or less distinct orange line runs along 

 the dorso-pleural suture to the wing-base, and a thin line runs down the 

 suture behind the mesopleunB, and another line between the hypopleurai and 

 the hind coxae. Pubescence inconspicuous and by no means dense, consisting 

 of rather short black bristly hairs, though the hairs become slightly longer on 

 and near the scutellum. Pleurae light ashy grey, mainly bare but the 

 prothorax has obvious pale pubescence and the inflated metapleurae bear 

 moderately dense rather long pale pubescence, and a few very tiny almost 

 impercei:)tible pale hairs occur near the upper margin of the mesopleurse ; 

 metapleurse sometimes dull reddish black. tScutellum of the same ashy grey 

 colour as the thorax but with the extreme tip dull ferruginous. 



Abdomen elongate and conical, with seven obvious segments of which the 



basal five are nearly equal in length but the next two are shorter, while if an 



eighth segment is visible dorsally it seems to form part of the genitalia, dull 



orange with a row of black dorsal spots, of which the one on each of the five 



basal segments is usually isolated and touching the foremargin of the segment 



but not extended to the hindmargin : in very pale specimens the isolated 



spots continue on the sixth and seventh segments and may even be small, but 



usually the spot on the fifth segment is larger than the others and may leave 



little more than the hindmargin orange, while on the sixth segment blackish 



markings usually spread right across the base or may even occupy all the 



segment except the hindmargin, and the seventh segment is usually all black 



except for an occasional very narrow orange hindmargin ; the sidemargins of 



the basal four or five segments are narrowly black, slightly widening about 



the base of each segment. Belly yellow on the four basal segments except 



sometimes at the extreme base (and as mentioned in varieties later on), but 



beginning to become black after the foremargin of the fifth segment to the 



tip, though in pale specimens these last three segments may be only orange, 



and in dark specimens even the fifth and sixtli segments may have very 



narrow orange hindmargins. Pubescence dorsally short, inconspicuous, and 



all black, but longer about the sides of the four basal segments ; ventrally 



the pubescence is pale and less rigid on the yellow part, not scarce but not 



abundant. Genitalia with a short dull black dorsal plate (whicli is probably the 



remains of an eighth abdominal segment), and after that with a pair of lateral 



blackish or orange-black lamellae or plates (in pale specimens orange at the 



base) which are produced at their ends to a rather long narrow process which 



is often incurved and partly concealed, and these lateral lamellae bear short 



black or yellow pubescence, while between them lies a pair of short clearer 



orange lamellce, and there is a blackish basal ventral folate which is usually 



margined with luteous. 



Legs dull brownish orange ; front coxie long, normally dull orange but 

 more or less greyish black at the base and sometimes even almost to the tip, 

 and clothed in front with fairly long and abundant pale pubescence 

 which leaves a small shining darker bare space at the base ; front trochanters 

 obscurely blackish ; posterior coxae shorter, dull greyish black, but more or 

 less obscurely orange about the tip or even apical half and behind, and 

 bearing fairly long but less abundant pale pubescence in front of the 

 middle pair and outside the hind i)air, l)Ut (juite bare on all about the basal 

 half of the hind pair; posterior trochanters longer and more distinctly dull 

 greyish black, Avith faint orange refiections ; all the tarsi rather blackish 

 though the anterior pairs are dull dark orange at the base ; there is a 

 l)road indeterminate darkened ring near the tip of the hind femora, and 

 sometimes the tip of the hind tibiie is ilarkened. Pubescence practically 

 none, but the legs are wholly beset with tiny black bristles among which 



