Zenillia. 337 



old collection are two specimens, one is vulgaris, the other nemea; 

 this latter specimen has been examined by Stein, wlio came to the 

 same result. It is interesting that Zetterstedt noted the yellowish 

 frons, wliicli in reality seems to be a good character for the species 

 against vulgaris, at all events generally, and it proves that the 

 Danish specimen, which Zetterstedt had seen, no doiibt was nemea. 



71. Zenillia R. D. 



Species of small to medium size, and of black colour, more or 

 less greyish, sometimes yellowish pruinose. Head about as broad as 

 thorax, nearly flat behind and not pufl^ed out below, higher than 

 long. Frons broad and only slightly broader in female than in male, 

 more or less protruding, but generally not much. Jowls narrow, 

 from quite narrow towards one third of the height of the eye. Inboth 

 sexes ocellar, inner and outer vertical and in female two orbital 

 bristles; the inner vertical bristles may be small or almost wanting 

 in male. Generally relatively strong postocellar and also distinct 

 occipital bristles. Behind postocular bristles rows of black hairs. 

 Frontal bristles descending at most to insertion of arista, two or three 

 uppermost reclinate in both sexes. Cheeks bare. Vibrissæ ascending to 

 the middle or above. Eyes hairy. Epistoma retreating, not reflected 

 below. Antennæ inserted more or less above middle of the eye; third 

 joint about three to six times as long as second; arista with second 

 joint short. Thorax quadratic or a little rectangular; four postsutural 

 dorsocentrals, and three præ- and three postsutural acrostichals ; a 

 præsutural intraalar bristle. Scutellum with four marginal bristles 

 on eacli side, the apical smaller, crossing, sometimes somewhat erect. 

 Three or four sternopleural bristles. Pteropleura with one or a couple 

 of bristles above. Abdomen ovate or more elongated; excavation on 

 second segment reaching hind margin; there are discai and marginal 

 bristles, the former sometimes irregular and less distinct; second 

 segment with a pair of marginal bristles, rarely weak or nearly wanting; 

 fifth segment covered with bristles. (In non Danish species there may 

 be only marginal bristles). Legs with somewhat strong bristles; 

 middle tibiæ with one anterodorsal bristle (roseanae) or mth more 

 than one ; hind tibiæ with an anterodorsal row of unequal bristles ; 

 claws and pulvilli in male somewhat elongated; front tarsi in female 

 simple. Wings with first posterior cell more or less narrowly open, 



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