a 
28 Mr. M‘Lachlan’s Notes on 
one-fifth of the entire wing); it is preceded by a milky 
band, as is usual. 
9. Adult. The black band commences as in the 
male, and occupies the entire apex of the wings, 
excepting a terminal vestige (1} mm. long), which is 
paler (in very adult examples this vestige probably 
disappears, leaving the wings coloured as in the male). 
Size variable. Length of abdomen, male, 41—50 
mm.; female, 35 mm. Length of posterior wing, male, 
84—42 mm.; female, 37 mm. I have six males and two 
females before me. 
Allied to picta, but in the latter the black terminal 
portion of the wings in the male commences about the 
last third of the distance between the nodus and the 
pterostigma (thus occupyiug more than one-fourth of the 
entire wing); and in the female there is a black band, 
commencing as in the black apex of the male, but ter- 
minating at the origin of the pterostigma, thus leaving 
a large apical hyaline space. 
T’. derivata roight be considered a race of picta, Rbr. 
(Saundersti, Selys), but the much less extension of the dark 
apex of the wings in the male, and the great difference 
in the female, appear to entitle it to specific rank. 
Thore equatorialis, Selys ? 
Two immature females resemble those noticed by me 
in Trans. Ent. Soc. Lond., 1878, p. 90, but the opaque 
band is very visible on both pairs of wings. 
It should be remembered that in the typical examples 
of equatorialis, which is very adult, the opaque band is 
scarcely evident; then, supposing all these examples to 
pertain to the same species, the band becomes less 
distinct, according to the time the insect has been 
flying, which is rather opposed to what we find in other 
instances. 
Also it should be remarked that no male insect is 
known which can be paired with these females. 
Thore concinna, i. s. 
Bronzy black; head, thorax, and base of abdomen 
marked with the spots and lines usual in the genus, and 
reddish orange in colour. Pterostigma dark brown in 
black veins, somewhat dilated, 4—4$ mm. long, sur- 
mounting 10—17 cellules ; 41—58 ante-cubital nervules, 
and 58—68 post-cubital in the anterior wings. 
