Genus Stegomyia. 143 
and it is really astonishing, if one has none of those hanging 
about, the reduction in their numbers. 
“Tt is not an efficient intermediate host for the Filaria 
nocturna, as you state in your book (wide my paper in the ‘ Brit. 
Med. Journ.,’ June 1. 01).” 
Regarding the egg-laying habits, Dr. St. George Gray writes 
me as follows :—‘‘ There were no eggs yesterday evening or this 
morning at 6, 9 or 12 oclock ; but at 3°45 p.m. I found twenty- 
five eggs floating singly on the surface of the water. They must 
have been deposited in the early afternoon, at the time these 
mosquitoes are most attentive.” 
Pairing of Stegomyia.—Dr. St. George Gray writes regarding 
the pairing of Stegomyia fasciata as follows :—‘‘I have frequently 
seen the pairing of Stegomyia in my cage. The male invariably 
gets under the female, who may or may not carry him off and 
complete the process in the air. Ina cage in which I had fifty 
or sixty this went on all day long, the males flying from one 
female to another, apparently never tiring.” 
The Breeding of Stegomyia Fasciata in England. 
Through the kindness of Dr. Finlay, to whom is due the 
great discovery of the connection between the ‘‘ mosquito and 
yellow fever,” I have received the ova of the “yellow fever ” 
carrier S. fasciata. I did not think Stegomyia fasciata would 
live and breed here, and hence the ova sent by Dr. Finlay 
from Cuba were doubly welcome. 
From neglect, these eggs after their journey (sent dry in 
a test tube) were left for two months. They were, however, 
as an experiment, put in some tepid water in my greenhouse, 
and, much to my surprise, in less than. twenty-four hours they 
gave rise to Jarvae. The majority lived for ten days and then 
commenced to die, but six entered the pupal stage at the end of 
three weeks. Of these, one gave rise to a perfect female, of quite 
normal appearance, the others to males. 
A series of this world-wide species has been sent by Dr. 
Bancroft from Australia, and is represented by eighteen specimens 
(g’s and ?’s), which show considerable variation, The ?’s 
are notably larger than East Indian, West Indian or Asiatic 
specimens, but the ¢’s are no larger. They were taken in 
December, 
Three ?’s show very marked white apical banding to the 
