514 PROF. J. O. WESTWOOD ON THE URANTIDA. 
that the tendency to form one, two, or even three small cells by the branchlets of the 
subcostal vein more or less anastomosing together, near the middle of the fore margin 
of the fore wing, is one of the most constant characters of the Geometride. No such 
small cell occurs in the Uraniide'; nor, as Mr. Packard remarks, is any Geometrideous 
larva known having the normal number of sixteen feet, in consequence of which the 
peculiar mode of locomotion exhibited by the ‘‘looper” caterpillars of the latter 
family is rendered necessary. In the Uraniide, on the contrary, the larve have sixteen 
feet; for, even in that of Urania rhipheus, as described by M. Sganzin, ‘il n’y avait 
aucune interruption de pattes,” although when walking they are said to have “ quel- 
ques rapports avec les chenilles dites Arpenteuses et dans le repos elles formaient 
entiérement la boucle.” 
On casting our eyes over the extensive family of the Geometride there are a few 
species which, in their larger size and in the possession of a short tail to each of the 
hind wings, approach more nearly to the Uraniide than the rest. Urapteryx, with 
which M. Guenée commences the series of the Geometride, forming “un assez bon 
passage aux Uranides,” is remarkable for the arrangement of the veins of the wings, 
recalling to mind that of the Saturnides, and differing from the general types of the 
family. Plate LXX XVI. fig. 5 represents the veins of the fore wing, and fig. 6 those 
of the hind wings of U. sambucaria. It is true that we here see three branches to the 
median vein and the lower discoidal (c3*), or the independent vein of Mr. Packard, 
arising from the middle of the extremity of the discoidal cell; but both on the fore and 
hind wings a branch (representing the upper discoidal vein, B5*, in the fore wings) is 
wanting, as is also the small subcostal discoidal cell or cells. 
There are, however, certain moths, natives of the Malayan archipelago, which ex- 
hibit a much closer resemblance to the Uraniide than Urapteryx in the arrangement 
of the veins of their wings, the hind pair of which are likewise furnished with a 
short broad tail, marked (like that of Urapteryx) with a somewhat eye-like black spot. 
These form the genus Strophidia of Hiibner and Felder (Micronia, group 1, H. N. 
Lép. x. p. 24), the first species of which (Micronia astheniata, from Borneo) is named 
by M. Guenée after my genus Asthenia (upon which observations will be found in the 
later part of this memoir). Other species are:—M. caudata, Fab. ( fasciata, Cram. 
pi. 104. f. D); IZ. obtusata, Guen. pl. 5. f. 6 (errore caudata); M. aculeata, Guen. pl. 13. 
f. 8; M. striataria, Linn., Clerck, pl. 55. Two very typical species have also been figured 
by Messrs. Felder and Rogenhofer (Strophidia pannata, Novara Exp. pl. cxxviii. fig. 39, 
from Halmaheira and Salwatti, and S. phantasmah, ib. fig. 40, from Gebeh, Java (Lern- 
stein)). Plate LX XVI. fig. 8 represents the venation of the anterior, and fig. 9 that of 
the posterior wing of a typical species of this genus closely allied to S. phantasmah, which 
‘In Chrysiridia rhipheus (P1.LUXXXV. fig. 15) there is a very narrow elongated subdiscoidal cell, resulting 
from the abortion of the extremity of the second branch of the postcostal vein (6 2) and its coalescing with the 
base of the third branch (6 3), quite unlike that of any of the Geometride. 
