44 
Psyche 
[June-Sept. 
dina and the other to the Bahaman helios. Klots, in his 
revision of the genus Eurema (1929, p. 139) has considered 
that dina presents a peculiarly complicated taxonomic prob- 
lem ; but this may be due to the frequency with which mor- 
phologically distinct local populations are encountered. 
Individuals from a given population seem to have a quite 
uniform facies, as is shown by the long series in the M. C. Z. 
from Cuba (dina), New Providence (helios) and Honduras 
(westwoodi) . There is considerable variation in the genital 
structures as Klots (1928, p. 6(5) has pointed out; but this 
variation seems in part at least to be geographical. 
The Bahaman populations that I have called u Eurema 
chamberlaini Butler” (Bates, 1934, p. 134) seem to belong 
to the dina complex, and the Cuban Eurema larse (Bates, 
1936, p. 226) may also belong there, although as our only 
specimen lacks the abdomen it is impossible to place it with 
any certainty. The Puerto Rican Eurema sanjuanensis 
(Watson, 1938) is unknown to me. 
The known West Indian dina populations might, then, be 
arranged as follows : 
Eurema dina dina (Poey) Cuba 
dina memulus (Butler) Hispaniola 
dina parvumbra (Kaye) Jamaica 
larse (Herrich-Schaifer) Cuba 
helios helios Bates New Providence, Andros 
helios mayobanex subsp. nov. Hispaniola 
chamberlaini chamberlaini (Butler) Great Inagua 
chamberlaini mariguanse Bates Mariguana 
chamberlaini subsp. indescr. Cat Is. 
Eurema dina memulus (Butler) 
Terias memulus Butler, 1871, p. 251, pi. 19, f. 6. 
$ . Wings above light orange, somewhat deeper in color 
toward the margins ; apex of forewing black, the inner edge 
of this black patch evenly rounded or slightly dentate, 
extending from a point about two thirds of the way out on 
the costa to the inner angle. Under .side yellow: immacu- 
late or with scattered brownish spots on the hindwing. 
Length of forewing, 16-17 mm. 
2 $ $ in the M. C. Z. from Haiti : Ennery (2500 ft., 
Aug., Bates) and “San Domingo” (Weeks Coll.). 
