266 Dr. Frederick A. Dixey on the 
stlia, the development of M varies. Most of the species, 
however, show the usual tendency of M to expand into 
an apical patch, either with or without reinforcement 
from S. The members of the series are generally 
reduced on the lower surface of the hindwing to a row 
of marginal dots; and the great characteristic of the 
present series, namely that it belongs to the nervules, 
and not, like the former one, to the interspaces, is kept 
up throughout. On the upper surface of Catopsilia 
flava 2 (Fig. 21), M and 8S are both well developed, and 
their relation to one another closely resembles that 
which obtains in Colias. 
The same series is often present in the genera Ivias 
and Teracolus ; being, as usual, most constant in the 
females, and most prominent on the upper surface. It 
appears occasionally as a chain of spots, as in the hind- 
wing of many specimens of J’. ione ?, and some of 
T. regina, but more often as a simple marginal band, as 
in JI. marianne (Fig. 18). This band may be com- 
pletely fused with S, as in the hindwing of 1’. phisadia, 
or partially so, as in 7’. amata. A plain marginal band, 
in the forewing expanding at the tip and more or less 
indented opposite the branching of the median nervure, 
in the hindwing sometimes breaking into a chain of 
spots, is also the usual condition of M in the genus 
Tervas. 
In Nepheronia and Hronia M is generally present as 
a well-developed marginal band sometimes more or less 
fused with 8, and often sending dark prolongations 
inwards along the course of the nervules. In some 
species, however, as N. thalassina and EH. leda, it is 
mostly confined to the apical region; in the latter 
indeed it is absent from the hindwing of the male 
altogether, and barely visible on that of the female 
(Fig. 23). The series in Huchloe is generally recogniz- 
able as a row of dots, sometimes fused at the apex with 
the anterior members of §; but often, as in H. tagis and 
H. ausonia, preserving its independent existence. 
The condition of M in the genera Metaporia and 
Huphina recalls that in Nepheronia; the constituent spots 
being generally fused into a marginal band from which 
dark offshoots run inwards, accompanying the course of 
the nervules. A similar description will apply to Pontia, 
though in this genus the dark markings are often greatly 
