64 MR. F. F. LAIDLAW ON 



distribution of the genera fits in well with the proposed 

 arrangement. The second group, Idocordulina, however, is not 

 in so satisfactory a condition. The species referred to it are 

 mostly rare, largely tropical in distribution and hence their 

 larval forms are but little known, and the characters of 

 their venation are very diverse. In consequence there is reason 

 to suspect that the group will prove not to be a natural one, 

 although as no criterion is yet available for a better grouping of 

 the genera referred to it, needs must for the present that it be 

 retained in its existing form. 



The group Synthemina, being purely an Australian one, does 

 not concern us here. 



Of each of the other three Borneo has representatives. 



Writing in 1899, Kriiger * was able to record only one 

 Corduline for Borneo, and but fourteen for the whole Malay 

 Archipelago. 



Martin in his Monograph of the Corduliinfe, in the " Collections 

 Zoologiques du Baron Edm. de Selys Longcha.mps, Fasc. xvii." 

 published in 1906, gives a total for the island of seven. 



In the present paper, thanks to the amount of material sent 

 to me from the Sarawak Museum by Mr. Moulton, the Curator, 

 I am able to give the following list of species referable to this 

 subfamily : — 



Eucordulina : 



HemicorduUa assimilis Selys. 



Idocordulina : 



Metaphya mica7is Laidlaw. 

 Idionyx dohrni horneensis, subsp. n. 



Macromina : 



Macromia cincta Ramb. 



,, horneensis Kriiger. 



„ gerstaeckeri Kriiger. 



,, cingulata Ramb. 



,, westtvoodi Selys. 



„ sp. ? _ 



Epophthahnia ausiralis Hagen. 



,, vitiigera Ramb. 



One may, with tolerable confidence, predict additions to this 

 list in the future. 



Group i. Eucordulina. 



1 . Hemicordulia assimilis Selys. 



M. Martin has very kindly examined a male of this species for 

 me and determined its identification. It is new to the Bornean 



* Kriiger, Stettin. Ent. Zeit. 1899, pp. 321-338. 



