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2. ONCODES 469 



0. pa/If j)cs, but has the thorax rather densely punctate and bearing longer 

 more erect pubescence than in 0. (/ibbosiis, though this jDubescence is pale 

 grey as in that species, and not so long, erect, or abundant as in 

 0. 2yni/i2)es ; abdomen clear black with conspicuous bone-white bands on 

 the hindmargins of the second to sixth segments, usually widest at the 

 middle on the third and fourth segments, and with a slight similar band on 

 the fifth; belly white, with an entire black band near the base and with 

 triangular black spots down the sides ; femora black at the base, becoming 

 bright brown about the middle and orange on the apical quarter ; tibise 

 darkened anteriorly and dorsally except at the tip ; hind tibipe slightly 

 curved ; tarsi all obscured dorsally ; claws black ; wings with the fore- 

 marginal veins brownish; squamse whitish glassy, with rather broad 

 brown (sometimes only light brown) margins ; halteres with light brown 

 knobs ; polished base of the arista short. Female with the hindmargins 

 of the abdominal segments obscure luteous; femora with the basal half 

 or more black. 



