712 ASILID^ 



35 (34) Antennae ending in a pointed two-jointed style (fig. 384). 



36 (37) Pubescence rather long and dense on the thorax, abdomen, and 



legs, with a tendency to form lateral tufts on the abdomen. 



Prsesutural, supra-alar, and postalar bristles existing though 

 indistinct, also slight marginal bristles on the scutellum ; metapleural 

 tuft very large and long. Femora with long dense pubescence but no 

 bristles. Fourth posterior cell either open or closed. 



Pycnopogon. 



37 (36) Pubescence shorter and less dense, and without any tendency to 



form lateral tufts on the abdomen. Amphisbetetus. 



38 (33) Abdomen moderately or decidedly long, and always rather 



slender. 



39 (54) Alulae distinctly developed though sometimes small (fig. 385) 



(conf. Eriopogon). 



40 (41) Fourth posterior cell bluntly closed (fig. 385) {v. notes below). 



FiQ. 384. — Pycnopogon 



fasciculatus S- X 22. Fia. 3S6.—LaphysUa sahulicola S ■ x 14^. 



Antennai with the basal joint provided vpith a more or less com- 

 pact knob on its underside ; style bent downwards, two-jointed. Face 

 broad and evenly pubescent without a knob. Proboscis horizontally 

 porrect. Scutellum arched in normal fashion, pubescent but without 

 any distinct marginal bristles. 



N.BA. — ^?^c2//orr^?/7^(:•/M/s sometimes has the fourth posterior cell 

 closed, but may easily be known by its recurved proboscis ; Scylaticus 

 also often has this cell closed, but may be distinguished by the bare 

 upper part of the face and by the bare flat disc of the scutellum round 

 which are strong marginal bristles. 



N.B. 2. — Lajihyctis has its face-beard limited to the mouthmargin 

 • (as in Sa7-opogon). Lajyhystia sexmacvlata Herm. (nee. Say) appears to 



be a Triclis, 



Laphystia. 



41 (40) Fourth posterior cell wide open or only moderately contracted 



(v. notes under preceding genus). 



42 (45) Face with a distinct knob. Palpi long. 



Rather densely pubescent flies ; dorso-central bristles absent or 

 indistinct; metapleuras with a long dense tuft of pubescence (rather 

 like a fan in C lateralis). Face-knob extended up to the antennae. 

 Alulse small but obvious. 



N.B. — Cyrtopogooi tenuiharbus has no face-knob. 



