HETEROCERA. 



223 



72. Hypocala australiae Butler. 



Hypocala australiae Butler, Ann. Mag. Nat. Hist. (6), x, p. 21, 1892. 

 Tutuila : Leone Ed., 1 $, 22.iii.1926 (Judd). 



Manua : Ofu, 2 2 27.iii.1926 (Judd) ; Tau, 2 $?, 20, 23.ii.1926 

 (Judd). 



I have been unable to spend the amount of time required to make a com- 

 parative study of the species in the genus Hypocala, but I have failed to find 

 any constant characters on which to separate the Samoan specimens from the 

 Australian. The upper and under sides of the hindwing of a Samoan and an 

 Australian specimen of Hypocala australiae are figured for comparison. Slight 

 differences do exist, but further study is needed on a larger series of each species 

 before consistent differences can be substantiated. The genus is worthy of a 

 detailed investigation from a zoogeographical point of view. 



73. Rivula polynesiana Hampson ? (Plate XVIII, fig. 10). 

 Rivula polynesiana Hampson, Descr. New Gen. Spec. Noctuinae B. M., p. 256, 1926. 

 Tutuila : Pago Pago, 1 $, v. 1896 (de la Garde). 



This specimen was associated with the type of R. polynesiana by Hampson, 

 but in spite of the fact that it is crippled, I believe it represents a hitherto 

 undescribed species. 



74. Rivula dipterygosoma, sp. nov. (Plate VI, fig. 13 ; Plate VII, fig. 7 ; 



Plate XII, fig. 2). 



Palpus, antenna, head, thorax, pectus, abdomen and legs light buff, 

 faintly tinged with warm sepia, the abdomen with some fuscous irroration and 

 with two minute downwardly directed tufts of black scales at about two thirds. 

 Forewing light buff, faintly tinged with warm sepia, except for a strip below costa ; 

 costa edged, but not continuously, with warm sepia ; two sharply oblique warm 

 sepia to blackish brown antemedial dots below the cell ; a small dot or streak 

 at upper angle of cell, and a larger, rounded, conspicuous spot at lower angle ; 

 a sharply oblique, curved (convexity tornad) row of warm sepia to blackish brown 

 interneural dots from below apex to inner margin at two-thirds ; a terminal 



