THE CANADIAN ENTOMOLOGIST. 



51 



third but little longer than the second, rounded and laterally compressed 

 but small, with a delicate, bare, terminal arista which is 2-jointed at 

 extreme base. Face bare, wholly dark coloured, not prominent, neither 

 carinate, tuberculate, nor hollowed, rather abbreviated below. Thorax 

 narrower than head, with a few weak bristles posteriorly and on 

 scutellum. Abdomen at base about as wide as thorax, narrowing 

 posteriorly. Hypopygium prominent, curved under the abdomen. Wings 

 (see fig. 4) longer than abdomen, spurious vein absent, third vein straight 

 and not bent into first posterior cell, marginal cell wide open, anterior 

 cross-vein far before middle of discal cell and rectangular, first posterior 

 cell open, an apical cross-vein springing from fourth vein about as far 

 beyond posterior cross-vein as length of latter, this apical cross-vein 

 evenly bowed in and leaving the remaining section of fourth vein as a 

 stump at Its origin. While the apical cross vein greatly narrows the first 



Fig 4. 



Tun^ 



Fig 5. 



posterior cell, this stump, or rather this last section of the fourth vein, 

 proceeds on to the margin of the wing, thus forming an extra posterior 

 cell. Posterior cross-vein nearer to margin of wing (on fifth vein) than 

 }'2 its length. Anterior and middle metatarsi about as long as remaining 

 tarsal joints together. Hind metatarsi (see fig. 5) and two following 

 joints equal, widened outwardly, thin and flattened, the metatarsus on its 

 outer edge with a long slender cilium or petiole which is winged at its 

 base ; the third tarsal joint with a similar cilium, but not winged at base, 

 bearing two round, thin and flattened chitinous tips or appendages, one 

 at the end, the other on posterior border of cilium a little beyond middle 

 and connected with base and inner extent of cilium by a clear thin mem- 

 braneous wing ; fourth joint more elongate, its body or inner portion 

 more thickened, but furnished outwardly with an enlarged thin and 

 flattened wing which is strongly notched on its posterior inner border, 



