106 IMr. Roland Trimen on 
over Avhite markings more observable tlian on upper side ; 
3 additional white s]")ots at base ; sub-a]ncal stripe com- 
mencing on costa Avith a broad white mark ; brown border 
commencing at base, extending widely along costa so as 
to cover u]iper portion of discoidal cell (in'orated with 
whitish scaling on each side of costal nerviu'e), and occu- 
pying apical region to below extremity of 3rd median 
nervule ; some faint whitish irroration on costa near apex 
just above Avhite spot; and some (rather stronger) at 
lower extremity of sub- apical stripe ; a double row of hind- 
marginal white lunules ; a blue tinge over the black 
ground-colour, especially on the edges of the large central 
marking of the anal-angular spot and of a minute spot 
above the latter. Hhuhciiuj : basal lobe dull-white ; this 
duU-Avhite extends beyond precostal nen'ure ; an orange 
dot and a white dot at origin of costal and median ner- 
vures ; white patch duller than on iipper side, larger and 
more irregular in outline, widening so as to occupy inner- 
margin to its edge as far as in a line Avith end of abdomen, 
and emitting a cons]iicuous ray xipAvard to apex from 
bctAvcen the sub-costal nervules ; fi-om outer angle of patch 
there extends some dense whitish irroration, on each side 
of 3rd median nervule, as far as hind-mai'ginal lumdes ; 
5 distinct dots in sub-marginal roAV ; two rows of hind- 
marginal lumdes, thin, distinct, almost continuous through- 
out. 
Pal]n and legs of the same greyish-brown as the under- 
side of liindAvings and of great part of the forewings. 
This Diadema is one of the puzzling senes of very 
closely allied forms that includes D. Anthedon, Doubl., 
D. duhia, De Beauv., D. mima, mihi, etc. It completes 
the list of striking mimetic analogies between the known 
African Danaides and Diadcmce, by presenting an un- 
mistakcable mimicry of Danaia Ochlen, Boisd., a local 
species inhabiting the coast of Natal and St. Lucia Bav. 
All the Avhite markings in the Diadema are in proportion 
smaller than in the Danais, and the central bar of the 
forcAvings is more obliquely placed ; while on the under- 
side the grey colouring is paler, and the hindwings want 
the narrow basal black of Ocliloa, and ]iresent a pale raA' 
(from the central patch to the apex) Avliich is not found 
in the latter. 
D. dcceptor is intermediate in character between D. 
mima and D. Anthedon, but is on the Avhole nearer to 
the former, both in size and markiuGTS ; thous^h the ab- 
