. Breeding Grounds of Larvae. 43 
which I make to be C. fatigans , Wied., says that it is unlike Gules 
and like Anopheles in that it does not breed in pots and tubs, 
but in “ quiet shady pools containing plenty of small green plants. 
It is, however, to be found in pools on open fields, in slowly- 
running streams, and in the water of rice-fields. Indeed, what 
has been said with regard to the haunts of Anopheles larvae 
applies to the larvae of this ‘ Filaria-bearing ’ mosquito.” 
Major Ross, in the Report previously quoted, says, with regard 
to Culex larvae, that they are found in tubs, pots, buckets, 
cisterns, empty oil cans, biscuit tins, sardine tins, gourds, flower¬ 
pots, broken crockery, pottery and bottles, even in unbroken 
bottles thrown uncorked on heaps of refuse. “ Occasionally, also, 
the larvae were found in hollows, in wells, pools by the side of the 
roads, and even in small runnels of water.” Ross also refers to 
the larvae of a Culex of the taeniatus type ; three of these came 
in the Sierra Leone collections, namely, C. fcisciatus , Fabricius, C. 
sugens, Wied., and a new species, 0. Africanus, mihi; but these I 
refer to a new genus, Stegomyia , which, judging from the larvae of 
the former species, have different characters in the larval stage to 
the typical Culex , and are referred to in the next paragraph. 
But as these species are mentioned only as Culex with the 
others, it is difficult to gather accurate information from reports. 
The “ taeniatus type ” * of Ross’s Report are possibly the Tiger 
mosquitoes of James’s valuable little paper, but the breeding- 
grounds do not tally. For instance, the West African Report 
says that “ the larvae of C. taeniatus type were observed in hollows 
in rocks, on the top of Signal Hill, and also some of the same 
larvae in a hole in rock hundreds of yards from human habitations.” 
James, in his paper, says, regarding the small “ Tiger ” mosquito, 
that it is pre-eminently the tub and chat tie-breeding mosquito 
seldom found elsewhere. 
> 
In any case, we know that larvae of the typical Culex will 
breed in a great variety of places, both natural and artificial, 
but especially in artificial receptacles near human dwellings. 
But there are a large number of “ non-domestic ” Culicidae 
whose larvae are found in small pools, &c., in woods. 
Dr. St. George Gray found Culex fatigans (called by him C . 
pipiens) breeding in wells, and destroyed them by the use of kero¬ 
sene, but Stegomyia fasciata occurred as usual. It thus seems that 
the two types of the genera Culex and Stegomyia have different 
breeding-grounds as well as a different scale and larval structure. 
* This should read fcisciatus. 
