Monof/ra2)h on the Sijnrrgi of the Oah-galls. 273 



especially roughly punctate wrinkled on the side 

 angles. Face with a very conspicuously strong 

 longitiidinal middle keel. Frontal furrows ending 

 by the side-ocelli. Wing veins stout, mostly 

 dark brown. Rcinhardi. 



-f--f- Mesothorax with far apart sharply concise wrinkles, 

 between which the surface is smooth and shining. 

 Face with a slight middle longitudinal keel, or 

 with none. Frontal furrows usually disappearing 

 before they reach the ocelli. Wing veins pale 

 yellow. evancsccns. . 



** Hind legs yellow, chestnut red, or somewliat 

 brownish. 



-f Eadial areolet distinctly more than twice as long as 

 broad. Wing veins pale yellow. 



\ Head and thorax wholly black. Hind femora fer- 

 ruginous, or blackish-brown. Front with rough 

 wrinkle like punctures. pallidipennis. 



++ Head luteous, with some black spots between the 

 ocelli. Front finely coriaceous, wrinkled with 

 scattered punctures. Sides of the prothorax and 

 mesothorax in the male almost always, in the 

 female occasionally luteous. Femora of the male 

 yellow, of the female brown. flam-pcs. 



•\-\ Eadial areolet not twice as long as broad. 



\ Hind femora black or brown. Wing veins stout, 

 brown. Face of the male wholly, or at least below 

 yellow, of the female wholly black, or yellow 

 below. Upper side of the first joint of the 

 antenntie in the male mostly with brown or black 

 marks. Hmjncanus. 



\\ Hind femora chestnut red or brown. Wing veins 



very pale. Face black. First joint of the 



antenna? yellow. ruficorivis. 



Second abdominal segment not punctured, or oidy so 



on the hind border. 

 a. Third joint of the antennic in the male thickened or 

 dilated towards the tip, not swollen. 



* Mesothorax with transverse sharp more or less 

 undulating keels, and with smooth or almost 

 smooth intervals. Furrows of the front most olten 

 not extending to the ocelli. 



