218 ©. R. Osten Sacken: 
from the East Indies, is a true Trichocera, as I have ascertained 
in the British Museum. The genus has also been found in amber. 
Mr. Eaton („Nature”, April 14 1881) observes that Tröchocerae 
principally fly at a temperature between 40 and 45 Fahrenheit, not 
lower than 36 (+ 2 Cels.). Dr. Simony, Wien. Ent. Z. 1886, p. 57, 
saw them crawl on walls at a temperature of — 1 Cels. — I am 
doubtful of the statements that Trichocera can fly at a temperature 
below freezing, as stated in A. Fitch’s Winter Insects, p. 10; in 
such cases the general temperature of the air must not be confounded 
with the temperature of the sunny spot in which the Trichocerae 
are flying. In arctic regions -(lat. 820) Trichocerae occur in July 
and August; comp. Journ. Proc. Linn. Soc. XIV, p. 117. Isaw an 
abundance of them at the same season during the cold summer 1879 
in the Engadine. 7”. regelationis often occurs in mines at a depth 
of 100 fathoms (Klaftern); Boheman, Ofv. Vet. Ak. Förh. 1849, p. 228- 
Trichocerae hide under damp stones, flowerpots, pieces of wood 
(Eaton, 1. c.). I found the larvae in winter under moss, growing on 
stone walls, 
Prof. Mik (Wien. Ent. Z. 1836, p. 58) recently described an al- 
pine species, with an ovipositor of a somewhat different structure. 
The formation of a new genus was proposed for 7. hirtipennis 
Siebke, first discovered in Norway and found afterwards in different 
parts of Austria (in Seitenstetten in Lower Austria by Prof. Strobl 
and in Bohemia by Mr. Kowarz). Compare about‘it Prof. Mik’s paper 
in the Wien. Ent. Z. 1882, p. 140. In the essential characters which 
distinguish Trichocera from the other Limnophilina 7. hirtipennis 
does not differ from the typical species (position of the subcostal 
crossvein, shortness of the seventh vein, presence of ocelli, pubescent 
eyes, position of the great crossvein at the end of the discal cell), 
The alleged differences consist 1° in the distinct pubescence of the 
wing-veins; but 7‘ trichoptera O. S. Western Dipt. p. 204, from 
California, as far as I remember a true Trichocera, has pubescent 
veins; 2°in a slightly different shape of the discal cell, owing to a 
different position of the crossvein at the base of the fourth posterior 
cell; this it not a generic character, and some similar structure occurs 
in 7. trichoptera; 3° in a somewhat different course of the seventh 
vein, which is concave instead of convex; 4° in an apparently different 
structure of the male forceps, the data about which, however are not 
very positively given. Whether the characteristic shape of the ovi- 
positor of Trichocera is also found in T. hirtipennis is not mentioned 
in the description. 
Two names were proposed for the new genus: Trichoptera 
