368 coxopiD-i:. 



2. Tliird antennal joint conspicuously long', more 



than twice as long- as 2nd, subcylindrical, [gen. n., p. 368. 



with distinct apical style Pleurocekinella, 



Third antennal jomtnever conspicuously long 

 or cylindrical, but oval or oblong-, with a 

 dorsal arista often thickened basally .... 3. 



3. Proboscis not geniculated at about middle, 



but only at the base; a rudimentary sub- 

 costal vein present Zodion, Latr., p. 373. 



Proboscis geniculated at about middle as 

 well as at base ; subcostal vein always 

 absent 4. 



4. Head in profile descending- much below 



eyes; cheeks at least twice as high as 



diameter of eyes Myopa, Fabr., p. 377. 



Head in profile descending only moderately 

 below eyes; cheeks at most as high as 

 diameter of eyes 5. 



5. Antenufe shorter than the distance from 



their base to the verte.x; Sicus, Scop., p. 376. 



Antennae longer than this distance Occemyia, Rob.-Desv., 



[p. 382. 



PLEUKOCEEINELLA, gen. nov. 



Intermediate between Conops and Pleurocerina, Macq. ; having 

 the general fades of the latter, but the antenure placed at the tip 

 of the extended frons as in Conops, instead of at the side of this 

 extension. 1st antennal joint rather elongate, cylindrical, 2nd a 

 little shorter than 1st, produced a little at the tip over the base 

 of the 3rd ; Ihe latter much longer that the 1st and 2nd together, 

 elongate-conical, slender, tapering from base to tip, with a 

 moderately short, very pointed, basally jointed, apical style, often 

 thickened at base. In all else as in Conoiys: femora not at all 

 thickened; subcostal cross-vein present, very short and rather 

 indefinite, situated at tip of auxiliary vein. 



GrKNOTYPE, P. dioctria'fonuis, sp. nov. 



291. Pleurocerinella dioctrisefonnis, sp. nov. 



(3" 2 • iJe"(^i '• vertex and frons black ; face pale yellow ; frons 

 and face with a brilliant, silvery-white shimmer when seen from 

 above ; fovese very deep, shining silvery. Eyes dark colfee-brovvn. 

 Antennae blackish-brown ; 2nd joint bristly, a little shorter than 

 1st; 3rd at least 1| times as long as 1st and 2nd together, more 

 or less elongate-conical but laterally compressed in the apical 

 half; style short and very pointed, not thickened at base. 

 Proboscis shining black, about as long as head ; labella well deve- 

 loped, light brown, pubescent. Occiput shining black, a little 

 grey-dusted towards margins, with brownish-yellow hairs behind 

 vertex. Thorax : dorsum, pleurae, scutellum and metanotum 

 rather shining black, with a little pale pubescence except on the 



