6o8 FAUNA HAWAIIENSIS 



Nesodynerus dilatatipes, P. 

 Odynerus dilatatipes P., huj. op. i. p. 37. 



Nesodynerus vittativentris, P. 

 Odynerus vittativentris P., huj. op. i. p. 65. 



Nesodynerus cooki, P. 

 Odynerus cooki P., huj. op. i. p. 64. 



( I ) Nesodytierus paractias P. 

 Nesodynerus paractias P., Pr. Hawaii Ent. Soc. i. p. -Ji. 



Nesodynerus oblitus, P. 

 Odynerus oblitus P., huj. op. i. p. 74. 



Nesodynerus eupferyx, P. 

 Odynerus eupteryx P., huj. op. i. p. 47. 



(2) Nesodynerus optabilis P. 



Nesodynerus optabilis P., Proc. Hawaii Ent. Soc. i. p. 61. 



This species has not been described at length, but only distinguished by such 

 characters, as are given in my tables of the species of Odynerus of the island of Oahu. 

 It is superficially somewhat like N. rudolphi, Odynei'us montanus, O. unicus and others 

 from Oahu. 



Black, shining, wings deeply infuscate and with purple iridescence. Clypeus 

 impressed at the apex and distinctly emarginate. Head shining, puncturation inclining 

 to be rugose. Mesonotum with the larger punctures very sparse and irregular, the finer 

 ones between these distinct, irregular and not dense, parapsidal furrows complete and 

 distinct ; scutellum finely and sparsely and rather indefinitely punctured, propodeum 

 nearly smooth, shining, trenchant at the sides. Basal abdominal segment shallowly and 

 remotely punctured, second very convex, subtuberculate in dorsal aspect ; beneath, the 

 costae moderate, the depression subtriangular, distinct, but not deep. Wings with the 

 two recurrent nervures about as distant from each other, as the first is from the basal 

 lower angle of the second cubital cell, distance from second recurrent nervure to the 

 apical lower angle of the cell rather greater than the distance between the recurrent 

 nervures ; the second cubital cell is wider above, less triangular, than in N. rudolphi. 



Hab. Oahu, Waialua district, outside the forest, flying over ferns. 



