310 A Monograph of Culicidae. 
sub-marginal cell very slightly longer, but narrower than the 
second posterior cell, its base nearer the apex of the wing than 
that of the second posterior cell, its stem a little longer than the 
cell; stem of the second posterior cell, which is broad, nearly as 
long as the cell ; posterior cross-vein about twice its own length 
distant from the mid cross-vein ; scales at the base of the wing 
violet. Halteres with ochraceous stem and fuscous knob. 
Length.—)5 mm. . 
Habitat.—Cara Cara, Demerara River, and Pomeroon River, 
British Guiana (Dr. Low). 
Observations.— Described from a single 2 taken by Dr. Low. 
It differs from H. cyaneus in the wing venation and in having 
two white median abdominal spots. The curious abdominal 
chaetotactic character is also not seen in H. cyaneus, as far as 
I have observed. 
Dr. Low sends the following note on this species: ‘‘ The 
Indians from the Cabacaburi Mission on the Pomeroon river 
used to bring me samples of this species amongst the mosquitoes 
they caught at nights. I also caught it myself at night two 
miles below this, at Pickersgill. When sitting at a window in 
the police hut there they used to come in and settle on me. 
Time, morning 9 to 11 a.m., during bright sunlight. It would 
seem, therefore, that it bites by night and day. I often got 
them with blood in their stomachs. I only dissected a few, and 
in those there was no trace of embryos of F. demarquat or 
F. perstans. Fairly common.” 

Genus 40. WYEOMYIA. Theobald (restricted). 
(Mono. Culicid. II., p. 267, 1901.) 
Head clothed with flat scales; thorax with spindle-shaped 
and flat scales; scutellum with flat scales. Chaetae on the 
metanotum. Palpi short; proboscis not as long as the whole 
body.. 
Wings with the veins with narrowish lateral vein scales. 
This genus has only been recorded from the West Indies and 
South America. The male has not yet been found. — 
This genus includes two species, namely, W. Grayii, Theobald, 
and W. pertinans, Willeston. 
