7 
‘and had obtuse ends. In this species the anal papilla appear to act as func- 
tional gills, since the larva had a habit of remaining long periods at the bottom. 
The siphon tube.—I\n the case of some species a variation in the number of 
“spines was noted. In S. sugens and S. fasciata these spines numbered about 
18. In SS. scu¢ellaris they were only nine in number. Some variations in the 
exact number was, however, noted in the same species. 
The nymph of Stegomyzta.—The shape of the respiratory trumpets in this 
and the allied species Desvoidea are characteristic. The trumpet is short and 
widens rapidly towards the free end. In mounted specimens the trumpets appear, 
from flattening, to be broadly triangular. A notch, as shown in the figure, is 
present (PI. I, figs. 3 and 4). In the wide trumpet opening, Stegomyza again 
approaches most closely the anophelina. In anopheles, however, the trumpet is 
rather flap-like and still more open than in Stegomyza (Pl. I, figs. 1 and 2). 
Desvotdea.—I have not had an opportunity of seeing the larva and nymph 
of this genus, but Theobald gives a drawing of the respiratory trumpet of the 
nymph which is indistinguishable from that of Stegomyza (PI. I, fig. 5). The 
extremely degraded antenna figured by Theobald (PI. Il, fig. 6) also closely 
resembles that of Stegomyza. The siphon tube is alsoshort. Index 1°7. Inaddi- 
tion James also notes that the larve adopt a vertical position when at rest. In 
larval and nymphal features this genus is then almost identical with Stegomyza. 
Grabhamia.—Theobald has figured the larva of G. dorsalis. The antennze 
are distinctly of the Cu/ex type, but the respiratory siphon islike that of a Stego- 
myia. The figure is too small to allow of a full description. 
Acartomyta.—Theobald’s figure shows that the antennz closely resemble 
those of Stegomyza and differ only in having small spines scattered over them. 
The respiratory siphon also possesses Stegomyta characters, being extremely 
short. The trumpets of the nymph, on the other hand, appear to resemble those 
in Howardina and Deinocerites (both in the sub-family Adeomyina). 
Culex.—The species at present forming this genus are so numerous that 
generalisations cannot be made on the result of the examination of a few species. 
It appears from my researches that many of the species differ more widely in 
their immature than in their adult stage. Certain species now classed under 
Culex are, judging by larval characters, sufficiently distinct to be placed in 
new genera, but we have not at present sufficient material to discuss this group 
adequately, and, indeed, a proper division of the enormous genus Culex is impos- 
sible until more is known of the immature stages of the species. 
Provisionally, however, we may draw attention to several groups, which 
from the dissimilarity of their larval characters alone, might well form separate. 
genera, 
Group l. Culex (restricted sense). Culex ( fatigans).—The ova are laid 
