2. ONCODES 467 



Thorax rather densely punctate, clothed with conspicuous denser and much 

 longer pubescence than 0. gihhosus^ and this pubescence is more brownish 

 yellow or brownish and obscures the ground colour more, and is also more 

 erect and more entirely of one colour. 



Abdomen mainly dull (or sometimes obscurely) luteous, with large black 

 dorsal spots and with narrow yellow hindmargins to the segments ; narrower 

 than in 0. (jibbosus, being conspicuously longer in proportion to its width 

 and consequently much less globular, and also much less bladder-shaped 

 when viewed sideways because the belly is flatter ; hindmargins of the second 

 to fifth segments narrowly clear pale yellowish, but otherwise an obscure 

 luteous or brownish luteous colour sjireads over all the abdomen except on 

 the large black dorsal spots, and inconspicuously on the lateral spots ; the 

 large black dorsal spots are subquadrate and are placed against the fore- 

 margin of each segment, that on the second segment being the widest and 

 reaching downwards to the pale hindmargin but rather undefined and 

 occupying fully three-fifths of the width of the segment or sometimes even 

 too undefined for accurate measurement ; the spot on the third segment is 

 better defined and occupies about the middle half of the segment and though 

 slightly produced behind about the middle is still not quite extended to the 

 yellowish hindmargin ; the spot on the fourth segment is similar, but is slightly 

 less wide and only extends down about two-thirds of the segment and is 

 consequently well separated by luteous coloring from the narrow yellowish 

 hindmargin ; on the fifth segment there is a smaller less defined spot, which 

 occupies about the middle third of the foremargin and extends only about a third 

 down the segment, though sometimes this spot is too undefined for accurate 

 measurement ; the sixth segment appeal's to be all black, but has a narrow 

 obscure luteous hindmargin or tip and also very vague luteous tinges on its 

 middle : viewed sideways the lateral margins of the dorsal plate are not 

 narrowly though sometimes rather indefinitely black, but distinctly more 

 narrowly so on the fifth segment and not extending to the end of that 

 segment. Pubescence long erect and rather abundant but not very conspicu- 

 ous, greyish brown on the three or four basal segments but paler grey on the 

 rest. Belly obscurely luteous brown with four pairs of large badly defined 

 pitchy black spots placed at the basal corners of the second to fifth segments, 

 and with conspicuous rather wide whitish hindmargins to those same four 

 segments, the sixth segment being black on the basal half and luteous on the 

 apical half ; belly by no means bare but with only inconspicuous thin light 

 grey pubescence. 



Legs pale luteous or almost yellow from the extreme base of the femora 

 to the last joint of the tarsi, and even the claws luteous with curved black 

 tips ; coxae and trochanters shining black but rather obscured by the longish 

 pale pubescence • knee joints darkened, but hardly at the base of the tibiai. 

 Pubescence on the femora pale yellow rather abundant and long all over, and 

 not quite so much adpressed on the tibiae and tarsi as in 0. gibbosvs. 



Wings hyaline, but the foremarginal veins smoky ; venation more complete 

 than in 0. gibbosus ; costal vein thin and dark nearly up to the end of the 

 mediastinal vein, then thickened and dirty yellowish until the end of the 

 subcostal, then again often more conspicuously black on the thickened 

 costal margin, but fading away just before the tip of the wing ; mediastinal 

 and subcostal veins brownish yellow ; cubital vein becoming pale before 

 the wingmargin ; even the postical vein yellowish, and its upper branch 

 across to the discal vein usuallj^ visible though sometimes very faint and 

 not quite reaching the discal vein ; base of the wing rather blackish ; lower 

 basal cell and anal cell usually complete or almost so, the latter being closed. 

 Squamse (thoracal) smoky (in some lights blackish) vitreous, roughened, 

 with a distinct well defined blackish margin, and with long greyish white 

 pubescence all over the disc and on the margin ; alar squamae small, paler, 

 and without any pubescence but with minute down on the disc and margin. 

 Halteres with dull black knobs and obscure stems. 



As usual in this genus the head is smaller and the \vings are longer than in 

 the male. Pubescence shorter than in the male, but much longer, darker, and 

 more erect than in 0. gibbosus. 



