284. Dr. Frederick A. Dixey on the 
of the wing, includes the apex of the space between the 
first and second subcostal nervules in addition to those 
above enumerated. D. egialea shows the same condition 
as D. pasithoe; but in D. crithoe, otherwise similar, the 
precostal space is black. In D. descombes? and D. belisama 
the red is confined to the costal interspace (7.e. the space 
between the costal and subcostal nervures); while in 
D. coeneus a submarginal set of roughly-defined red spots 
or dashes continues round to the anal angle the series 
begun by a red mark in the costal interspace, corres- 
ponding with that in the two preceding species, The 
submarginal series which, so to speak, becomes infected 
by the red coloration, is undoubtedly that spoken of above 
as series I (see p. 269). This latter feature of the Pierid 
pattern, somewhat indefinite in D. ceneus, becomes much 
more distinct in such species as D. nigrina, D. harpalyce, 
D. aganippe, D. eweharis, and D. argenthona. The latter 
of these has another well-marked red spot surrounding 
the second disco-cellular nervule, which represents a 
diffused reddish areain D. duris, and amore circumscribed 
patch in the same situation in D. cceneus. In D. hyparete 
S is going from the underside of the hindwing; in 
D. hierte it is gone ; but in both cases the red spots of I 
remain in their full, development. D. mysis, D. isse, 
D. echo, and other species exhibit the same feature in a 
more or less conspicuous manner. 
The same red coloration is visible, as we have seen, on 
the underside of many species of Prioneris in the form of 
a basal patch; and in one species (P. sita) it spreads to 
the submarginal spots of series I, exactly as in D. 
eucharis. In P. autothisbe the red is found in the costal 
and subcostal interspaces ; in P. clemanthe and P. vollen- 
hovit only in the inner division of the precostal space, 
whence it spreads inwards upon the body. 
In the American genera Huterpe, Pereute, Leodonta, 
and Catasticta, the red is usually present; but as in 
Prioneris and the pasithoe group of Delias, it is mostly 
confined to the basal portion of the wing.* In #, 
* An exception to this rule is furnished by Huterpe tereas and 
FE. critias, in which species the area of light ground colour 
immediately internal to that region of the wing which corresponds 
to the submarginal series §, is on both surfaces more or less 
deeply tinged with the same red colour as that of the basal 
patches. ‘his feature is due to mimicry, the two species named 
