Bracoriiuffl in the British Museum. lu'5 



Genus Parahelcon, Koknj. 

 Parahelcon, Kokuj. Revue Russe Eut. i. p. 14 (1901). 



Parahelcon konowi, Kokuj. 



Parahelcon konowi, Kokuj. Revue Russe Ent. i. p. 15 (1901). $ . 

 Optus euthyrrhmi, Cum. Proc. Linn. Soc. N.S.W. xxxvii. p. 19 

 (1912). $. 



Bab. Gosford, N.S.W. 



This genus is easily distinguished by the strongly depressed 

 median lobe of the mesonotum. The neuration is as in 

 Gymnoscelus ; the anal cell has two cross-nervures, but the 

 second is incomplete. The second transverse cubital nervure 

 meets the cubitus at right angles, not oblique as in typical 

 Gymnoseelus. 



Calohelcon, gen. nov. 



Anal cell of fore wing with two transverse nervures ; 

 nervulus interstitial or very slightly postfurcal ; second trans- 

 verse cubital nervure slightly oblique, not quite at right 

 angles to the cubitus ; first discoidal cell with a very short 

 petiole, almost sessile. Frontal excavation fairly deep ; 

 median lobe of the mesonotum normal ; parapsidal furrows 

 not very deep, not crenulated. Median segment smooth, not 

 areolated. First tergite as broad at the apex as the second, 

 narrowed at about one-third from the base, the basal portion 

 bilobed on the anterior margin and swollen on each side, at 

 least as long as the apical breadth, twice as b'.oad at the apex 

 as at the base. Terebra at least as long as the whole insect. 



Type of the genus, C. obscuripen?tis } Turn. 



Calohelcon obscuripennis, sp. n. 



$ . Nigra ; capite ruf o, antennis nigris ; segmento mediano dimidio 

 apicali, segmentoque abdominali primo, macula median a dorsali 

 subapicali nigra, albidulis ; alis fusco-hyalinis. 



c? . Feminse similis. 



Long., 2 > 15 mm., terebra? long. 17 mm. ; J , 14 mm. 



? . Clypeus narrowly depressed at the apex, the apical 

 margin straight, not reacting the mandibles in the middle. 

 Head massive, broader than the thorax, Vertex and front 

 smooth and shining, a short longitudinal carina between the 

 antennae; face finely punctured, with an impressed longi- 

 tudinal line on each side from the base of the antennae to the 



