16 
{ 4. Sub-fam. Foblotina : : : . Foblotia. 
ie 35% i Heptaphlebotomyina : : . Heptaphlebotomyta. 
Sec. A. 4 6. 53 Aedeomyina . : ¢ . Detnocerites. 
Howardina and 18 
other genera, 
Secwb: 1. Sub-fam. Corethrina. 
In the first place the position occupied by Stegomyia is too subordinate, 
A consideration of the characters of Stegomyta show that these mosquitoes 
differ much more from Cudex than do Melanoconton, Tentorhyuchus, etc. 
Theobald’s classification might be modified by removing the Stegomyi@ alto- 
gether from the Cuwlicina. This I propose to do and to place them in a 
division Stegomyina. The groups of genera Culex, Theobaldia, Melanoconion, 
Tentorhynchus, and Mansonta will then form a natural division differing widely 
from the last mentioned. 
Stegomytna. 
Ova * laid separately upon the water. Each ovum surrounded by 
small air chambers. 
Larva long and worm-like. Attitude vertical. Antenne degenerate. 
Basal tuft represented by small hair. Median and terminal spines 
rudimentary. Siphon tube short and stout. Index=2. 
Nymph trumpets expanded. Broadly triangular in shape. 
Imago. Habits diurnal. Scale structure distinctive. 
Culicina (restricted sense). 
Ova cemented together to form rafts. 
Larva more or less spiny in appearance. Antenne fully developed. 
Siphon tube rather long. Index 4 to 12, 
Nymph trumpets narrow. Openings oblique. 
Imago. Habits nocturnal. Scale structure distinct. 
In the second place it is doubtful if Megarhinus and Toxorhynchetes by 
themselves should be placed in a separate sub-family—a division of equal 
importance to that of Anophelina and Culccina. The character of the palps in 
this case does not seem to me a sufficiently important feature upon which to found 
the division, especially since in Zoxorhynchites the female palps are not much 
longer than in Muccdus. The genera Megarhinus, Toxorhynchites, Mucidus, and 
Psorophora appear to be a group of closely related genera showing the following 
features in common :— 
Larva specially modified for cannibal habits. Attitude horizontal, etc. 
Imago large and conspicuous species. The palps in the female longer 
than in Culex. 
® I think the observation by Skuse that the ova of S. notoscrepia are laic in rafts needs confirmation 
before it can be accepted, 
