239 
wings, antenne, and spurred fore tibiee, the females differ in the amount 
of development of their legs; whilst the species with entirely pec- 
tinated antennee offer still more numerous variations. If, again, we 
select the want of the spine of the fore tibize as a primary distinction, 
we find O. Herrichii, Hitbneri, and MacLeaii, varying greatly in 
the form of the males, in the larva-cases, and the veiming of the 
wings, although the latter have always_a deficiency in the number of 
the branches of the veins of the fore-wings. 
Bearing the foregoing observations in mind, the following distri- 
bution of the twelve species before us must be considered as an arti- 
ficial or technical one :— 
A. Antenne of the males semipectinated, body and wings greatly 
elongated. 
a. Cases of the larva with twigs on the outside. 
* Females with articulated legs. Sp. 1. O. Saundersii. 
** Females with exarticulated tubercles in the place of the 
legs. Sp. 2. O. Kirbii. 
aa. Case of the larva naked. Sp. 3. O. Templetonii. 
B. Antenne of the males bipectinated to the tip, body and wings 
short or of moderate length. 
a. Fore tibiz of the males without an elongated spur. 
* Wings short, rounded, fore wings with only ten branches 
extending to the margins. Sp. 4. O. MacLeaii. 
** Fore wings elongate, triangular, with 11 branches ex- 
tending to the margins. 
t Case of larva densely covered with thin twigs. Sp. 5. 
O. Hiibneri. 
tt Case of larva naked, ribbed. Sp. 6. O. Herrichii. 
aa. Fore tibize of the males with a long spur. 
* Fore wings with twelve branches extending to the margins. 
¢ Third branch of the median vein of the hind wings ac- 
companied by an extra branch. 
¢ Body robust, wings short, subtruncate. Sp. 7. O. 
Boisduvalii. 
t{ Body rather slender, wings more triangular. Sp. 8. 
O. Cramerii. Sp. 9. O. Lewinii. Sp. 10. O. 
consortus. 
++ Third branch of the median vein of the hind wings 
unaccompanied by an extra branch. Sp. 11. O. 
Doubledaii. 
** Fore wings with only eleven branches, extending to the 
margins of the wing, the third branch of the median 
vein not united with the preceding branch into a fork. 
Sp. 12. O. nigricans. 
The relationship of these insects with the families of Lepidoptera *, 
involving their natural situation in the order, is one which would 
* The idea that Psyche is Trichopterous, and not Lepidopterous, does not 
merit refutation. 
