264 THE CANADIAN ENTOMOLOGIST. 



three weeks. The fly is of unusual interest on account of the long 

 and extremely needle-like ovipositor of the female. 



AcucULA, gen. nov. 

 Head flattened or shortened-subhemispherical, in form ap- 

 proaching that of Milichia, but longitudinal axis less. Front of 

 male about three-fifths of eye-width, that of female about eye- 

 width. A pair of reclinate and slightly convergent vertical bristles, 

 a pair of reclinate orbitals in front of ocelli, a pair of proclinate 

 ocellar bristles, these all being equal in strength and length; rest 

 of parafrontals with fine hairs half the length of the bristles. An- 

 tennae inserted below eye-middle, reaching about three-fifths way 

 to oral margin, third joint somewhat elongate, arista short-pubes- 

 cent. Peristomalia with five or six equal bristles, the vibrissae not 

 differentiated. Eyes descending to lower margin of head in profile, 

 the cheeks narrow. Proboscis and palpi short, not exserted, the 

 oral cavity rather pronounced. 



Mesoscutum with bristles near posterior border only, short 

 hairs on rest; scutellum subtriangular but rounded apically, bear- 

 ing a pair of apical and a pair of lateral bristles slightly longer than 

 those of mesoscutum. xA.bdomen broad in both sexes, as broad as, 

 or slightly broader than, the thorax, suddenly narrowed at base; 

 oblong and flattened in male, slightly arched in female, but also 

 flattened and shortened-subrounded rapidly tapering apically. 

 Male hypopygium rather small. Ovipositor three-jointed; the 

 basal joint widened and flattened, about as long as basal width; 

 second and third joints equal and twice as long as basal or nearly 

 that, the second a little wider than thick, the third filiform needle- 

 like, with microscopically sharply-pointed tip and evidently tele- 

 scoping within second joint; whole ovipositor conspicuously longer 

 than female abdomen, but about as long as abdomen of male. 

 Legs short, normal in both sexes; the hind metatarsi a little elon- 

 gate, middle and front ones successively less so; middle tibise with 

 very weak short apical bristle. Auxiliary vein coalesced with first 

 vein throughout, latter ending a little before small crossvein; apical 

 cell not narrowed, second basal and anal cells distinct; hind cross- 

 vein about half way between small crossvein and point where 



