The breeding jar was kept in an incubator at an even temperature 
of 23 0 C. For the greater part of the time the insects were in 
complete darkness ; but a little light was admitted occasionally during 
the day. 
Summary 
Eggs remained dormant and practically dry 45-47 days. 
Life-Cycle 
Eggs. Incubation period ... 
Larval stage... 
Pupal stage ... 
Complete cycle . 
6-12 hours 
g days 
3 days 
12-13 days 
Culex fatigans , Wiedmann 
Abundant everywhere in the towns and suburbs, both at Iquitos, 
Peru; and at Manaos, Brazil. It breeds in large numbers in almost 
any collection of water, but the larvae were less common in the 
water of flooded cellars than were those of Mansonia tiiillans. 
Mansonia titilinns, (Walker) 
This species is as common as Stegomyia calopus in Iquitos, Peru. 
Its breeding-places are confined chiefly to the pools and puddles 
scattered throughout the town ; it was most abundant, however, in 
pools along the river banks. The specimens here recorded were all 
captured during the first three months of the year 1906. 
Examples of the adults were caught attempting to bite persons in 
1 fluted rooms and outside in shady places, especially between 
e lours of 7 a.m. and 9.30 a.m., and again in the early afternoon, 
t was only at dusk that swarms of these mosquitos appeared, 
attacking vertebrates of all kinds. On board the ships, alongside the 
ue e, t le walls of the cabins were at times black with them, and 
ere a souice of great discomfort, boldly attacking everyone and 
b _ n ? g mOSt V1C ‘ OUSly ' The occ upants of the houses along the river 
' were attacked to such an extent that the residences at times 
