i8 3 
Legs yellowish, covered with dark brown scales; first two tarsi of the forelegs 
apically white, last two joints dark brown, four midtarsi also with small pale 
apical bands; mid metatarsi and first two tarsal joints with minute apical yellow 
bands, last two indistinctly banded; in the hind legs the last three joints are pure 
snow white, and also the apex of the first; ungues very dark. 
Wings with the costa dark, with four distinct and several smaller white 
patches; there are also numerous patches of dark scales, which vary to some 
extent, over the wing areas; in the 9 , from which this description is taken, the 
fourth long vein is covered with pale dusky scales, whilst in a $ from St. Lucia, 
it is creamy white; halteres with pale stem and fuscous knob. Length, 4 to 5 mm. 
$ Palpi dark brown, with scattered white scales, especially on the last 
swollen joints; hair tuft pale; there is a pale ring at apex of the apical and base 
of the penultimate joint; antennae brown, with brown plumes; proboscis brown 
and narrow. The white scales on the head extend nearly over the neck ; scales on 
the thorax white; the larger ungues of the fore-feet biserrated. Length, 4 to 5 mm. 
During the period in which these experiments were being conducted I received 
very few specimens of this species, the sources being Miraflores, Ancon, Culebra, 
Paraiso and Corozal. Two specimens of Ce. argyrotarsis bit a patient having one 
crescent to 200 leucocytes and neither became infected. The patient was possibly 
an unfavourable case, and the experiment was not controlled by biting susceptible 
Ce. albimana at the same time. On December 2nd, from some Anophelines collected 
in labour cars at Corozal, one specimen of Ce. argyrotarsis was found containing a 
malarial zygote, 29/1 in diameter, with fine discrete pigment. 
Cellia tarsimaculata 
This mosquito resembles Ce. albimana very closely, except for the different 
arrangement of the white bands on the palpi. This mosquito was found to transmit 
malaria. 
Cellia albimana 
This form resembles the type in all respects except that the last tarsal joint 
in the hind-legs has a very distinct and persistent deep black basal band. 'I he 
thorax is rather browner in some specimens, and there are only two white bands 
tothe 5 palpi. The forelegs have dark-scaled femora, pale underneath, with a small 
white knee spot, the tibiae dusky-scaled and also the metatarsus above, pale below, 
apex white; the first two tarsi have yellow apical bands, the third dark, and the 
last clay coloured; mid legs with a large white spot near the apex of the femora; 
mid tarsi not definitely banded, but with a faint pale band sometimes at the apex 
of the metatarsus; the hind legs arc dark brown, with the second, third, and apex 
of the first tarsal joints pure white, the last joint white, with a distinct black basal 
band; ungues as in the type. Wings much as in the type, but the pale scales are 
more yellow in colour. Length, 3 3-5 to 4-5 mm.; ? 4 to 4-5 mm. 
This was the commonest species of Anopheline received as adults or larvae 
during the period embraced by this work, and was found to transmit both 
malignant tertian and simple tertian malaria. 
Cellia (?) gorgasi 
I’alpi as long as the proboscis, mostly black scaled, the terminal and 
penultimate joints light scaled, except at the bases and apices; mesothorax grey 
with fine brown scales, a black spot in front of the scutellum, a pair of sublateral 
black spots medially; wings with the veins scaled in black and white, two very 
M 
