8 
so as to form rafts. The length of the raft is a little greater than the breadth. 
The micropilar apparatus is “ milled ” laterally. 
The larve are found especially in domestic utensils, pots, barrels full of 
water, etc., and are rarely found in large masses of water or in water with 
much vegetation. 
The head is rather large and quadrangular in shape. Some conspicuous 
branched hairs arise from the dorsum. The clypeus carries two small thorn-like 
spines, but no structures at all resembling clypeal hairs. 
The antennz are fully developed. The basal hairs and the median and 
terminal spines are long and very noticeable. The first and second portions of 
the antenne form a straight line. The third portion is rather small. Small 
spines are scattered over the first and the proximal part of the second portion 
(Elsie ms). 
The siphon tube is distinctive ; ‘21 of body length. The siphonic index is 
4°3. The spines number 6 or 7 in each row and extend over the lower third 
of the tube (PI. II, fig. 24). 
The nymph of Culex fatigans has respiratory trumpets which project 
laterally as shown in Pl. I, fig. 9. The opening calls to mind the obliquely-cut 
mouthpiece of a penny whistle (Pl. I, fig. 7). This character, so far as my 
researches have gone, appears to be peculiar to the restricted portion of genus 
Culex we are discussing. 
Specific variation.—A second species belonging to the restricted genus 
Culex showed the following variation from the above. 
C. ?.#—Larva found in wells and cement tanks. Antenna with the second 
portion longer than in C. fatigans (PI. II, fig. 14). 
Siphon tube extremely large and conspicuous; *28 of body length. Siphonic 
index 411. Spines number 6 in each row and occupy the lower third of the 
tube (PI. II, fig. 25). Trumpets of nymph as in C. fatigans. 
C. pipiens—Theobald figures this species which clearly belongs to the 
above group. The figure given is too small to allow of minute description, but 
the antennze are as in C. fatigans. ‘The siphonic index 4°8. The siphon tube 
similar in shape to C. fatigans, 
Group II. C. ¢mpellens—A group of mosquitoes of the original 
genus Culex, possessing definite larval characters. 
~ Antennze asin Culex, but larger. Siphon tube more attenuated than in 
C. fatigans. Siphonic index 6, Spines number 6 or more and extend over 
basal one-third of tube (PI. II, fig. 23). 
/ Larve found more frequently away from habitations than are those of 
C. fatigans. 
pinata 2 RS es Ld ee ee eee 
* Norte.--Identified by Mr. Theobald as C. fatigans, but evidently a distinct species. 
