SEASONS OF INSFXTS. 515 
and amongst the moths, Phisia Gamma, the PJiytometrcs 
solarcs of Haworth a , and some others. Numberless Co- 
Icoptera belong to this section. The Donatio fly only 
when the sun is out and the air is warm ; they are then 
extremely agile and difficult to take. Some Hoplicc 
swarm in the day before noon, and then disappear b : 
most of the tctramerous beetles also appear to be diur- 
nal. The Libellulina and many other Neuroptera may 
also be so termed; and the Hymenoptera almost uni- 
versally, with the sole exception of the Formicidce . 
Amongst the Diptera, if we leave out the Tipularia?, the 
rest will be found for the most part to belong to the pre- 
sent section. 
ii. Crepuscular insects, strictly speaking, are those that 
appear only during the twilight, whether in the morning 
or evening; but the term may be understood, with some 
latitude, to signify all those insects that are seen only in 
the morning and evening, though after sunrise and before 
sunset. Of these, some come forth only in the morning, 
others only in the evening, and others both morning and 
evening. My memory only furnishes me with a single 
instance of an insect whose principal appearance and 
flight are in the morning. Catocala nupta I have often 
seen flying at this time, about six or seven o'clock, and 
never at any other: I am not however prepared to assert 
that it does not appear in the evening or night, but I 
have then never met with it. In the evening more par- 
ticularly you hear the hum of the dung-beetle (Geo- 
trupes), which Linne thought the prognostic of a follow- 
ing fine day ; and of the swarms of Melolontha vulgaris 
n Lcpidopt. Britann. 263 — . b Linn. Trans, v. 250. 
1 Vol. II. p. 1)5—. 
