426 INSECTA SAUNDERSiANA. 



mark. Male. — Abdomen pubescent, brown at th^ tip, much longer than 

 that of the female. Length of the body 2— 2^ lines ; of the wings 3^ 

 lines. 



Van Dieman's Land. 



Genus TANYPUS, Meiffen. 

 Tanyfus choeeus, Meigen. 

 United States. 



Genus PACHYLEPTUS, n. g. 



Mas. Corpus gvacile. Caput parvum, subrotundum. Palpi me- 

 diocriter longi. Thorax couvexns. Abdomen gracile, subcylindricum, 

 basi subcontractum, thorace diiplo longius. Pedes posteriores longius- 

 culi, sat graciles, femoribus subckivatis ; anlici raptorii, femoribus eras- 

 sis, tibiis subarcuatis. Alae angiistae. 



Nearly allied to Ceratopogon. Male. — Body slender. Head small, 

 nearly round. Palpi moderately long. Antennas mutilated. Thorax 

 convex. Abdomen nearly cylindrical, somewhat contracted towards the 

 base, much more slender than the thorax, and almost twice its length. 

 Posterior legs rather long and slender ; femora subclavate. Fore legs 

 raptorious ; femora thick, tibia slightly curved, closely applied to the 

 femora. Wings narrow ; veins like those of Ceratopogon in structure. 



Pachyleptus fasciatus, Mas. 



Niger, nitens ; alee limpidce, fasciis tribus nigricantibus latiusculis ; 

 halteres albi. 



Elack, shining, as are also the legs. Wings limpid, with three 

 rather broad blackish bands. Halleres white. Length of the body 2 

 lines ; of the vvings 4 lines. 



South America. 



