Odonata from New Caledonia. 45 



failed to notice the difference in tlie form of the posterior 

 lobe of the prothorax, which is more quadrangular in e,csudans 

 than in the other insect. But for this and the wholly 

 difterent anal appendages, it would be difficult to distinguish 

 our specimens of exsudans from material of the so-called 

 pygm(ea from Seychelles with which I liave confronted them *. 

 The resemblance between the two species^ which is at all 

 times very close, is accentuated by the present comparison, 

 for all four males of exsudans are free from the pruinosity 

 on head, thorax, and femora which characterises the type- 

 specimen, and one of the two M'hich retain the last three 

 segments of the abdomen have them coloured reddish brown, 

 as \\i pugnuea. 



Family Libellulidse. 



Subfamily Coubvlunm. 



Hemicordulia oceanica, Selys. 



' 1 c? , Phdue des Lacs, 18. ii. 14 (264j. 



This species was originally described from Tahiti, and the 

 Bi-itish Museum possesses a male collected in that island 

 during the visit of 11. M.S. 'Challenger^ in 1875. The fact, 

 however, was not mentioned in Kirljy^s paper on tiie 

 Neuroptera of the ' Challenger ' Expedition (Ann. & Mag. 

 Nat. Hist. (5) xiii. pp. 453-6, 1884). 



1 ? , Baie Ngo, 25. iv. 14. 



Martin refers to a " ? incomplete^' in the De Selvs 

 Collection (Coll. Selys, Cord. p. 12, 1906), but the only 

 description of that sex which seems to be available is that 

 given by Ris of an individual from New Britain doubtfully 

 referred to H. oceanica (Mova Guinea, ix., Zool. p. 503, 1913). 

 As our specimen from New Caledonia is in good condition, 

 and is doubtless to be associated with the male in the same 

 collection, a brief account of it is subjoined. 



Length of abdomen 37 mm. ; hind wing 34'5 mm. ; 

 pterostima 2 mm. 



Labium yellow; labrum yellow to brownish yellow; 

 clypeus greenish yellow ; frons hairy, orange anteriorly, 

 metallic green above. Vertex orange, partially overlaid with 

 metallic green. Occipital triangle orange, very hairy. 

 Autenuse black. 



* Males of this species from Seychelles do not seem to show any 

 essential points of diilereuce from males of ^. hyacitithus, Tillyard, from 

 Queensland, which Dr. Tillyard has been kind enough to send me. 



