terior legs compressed, more or less 

 dilated ; anal area of wings some- 

 times reticulated E«rifhrach)/dina'. 



a'. Face not laterally augidate ; legs very 

 often simple ; anal area of wings 

 never reticulate, 

 b. Clavus very rarely granulate, acumi- 

 nate at apex, rarely somewhat 

 obtusely but distinctly closed, two 

 Aeins remote or veiT remote from 

 the apex, sometimes behind middle 

 of clavus united in one ; costa 

 very rarely dilated ; tegmina 

 sometimes abbreviated or connate 

 Avith clavus and corium. 

 c. Claval vein not reaching apex, 

 united with commissural margin 

 near apex ; tegmina sometimes 

 abbreviated, or connate with 

 clavus aud corium, when so, the 

 lateral margins of the clypeus 

 are carinate. 



d. Face without au apical ocel- 



lus ; lateral margins of the 



clypeus always carinate or 



acute Dietyo]_)harhui:. 



d'. Usually three ocelli, one of 



which is situate ou the apex 



of the front ; frontal ocellus 



very rarely wanting, and if 



so, the sides of the clypeus 



are convex and not carinate . Oiriince. 

 c'. Claval vein continued to the 

 apex itself, or united with the 

 claval suture near apex : teg- 

 mina sometimes abbreviated, or 

 connate with clavus and corium, 

 when so, the lateral margins of 

 the clypeus are not cariuate. 



e. Head narrower than the thorax ; 



sides of the clypeus carinate ; 

 last joint of rostrum elongate ; 

 thorax angularly emarginate 

 at base ; tegmina ampliated 

 inwardly behind the clavus : 

 posterior tarsi with the first 



joint elongate Achiliiw. 



e'. Head narrower than the thorax; 

 sides of clypeus without a 

 ridge or with an obtuse ridge; 



