100 ENTOMOLOGY FOR MEDICAL OFFICERS 



scales as in Taniorhynchus. Africa, South Asia, Australia, South America. 



Trichopronomyia, Theobald. As Culex, but wing-scales as Tanio- 

 rhynchus, and proboscis of male hairy. 2 species (a single male of each 

 known) from South America and New Guinea. 



Hejiiaphlebomyia, Theobald. As Culex, but the wing-scales are 

 somewhat broader and the crease behind the 6th longitudinal vein 

 (which is present in most Culicines) may have a few scales. This so- 

 called 7th scaled longitudinal vein is in different species differently 

 described as "apparently not scaled," or as "a false nervure covered 

 with a row of scales," or as a 7th vein "with ten to fifteen scales." 

 2 species from Madagascar, i species from Portuguese West Africa. 



Dinocerites, Theobald. As Culex, but the palj>i are short in both 

 sexes; some of the wing-scales are broader ; and the antennae are of 

 more than common length — their 2nd segment being particularly long — 

 and in the male are not plumose, i species, from the West Indies, 

 known as the " crab-hole mosquito," because it breeds in the brackish 

 water that collects in the deep burrows of crabs. This habit may explain 

 the length of the antennse, which, like the elongated antennas of certain 

 insects that inhabit 'dark caves, and the streaming tactile filaments of 

 certain fishes (e.g. Bathypterois) that live in the sunless depths of the 

 ocean, may be an adaptation (on the principle of the blind man's stick) to 

 conditions where eyesight is of no avail. This suggestion is to some 

 extent strengthened by the fact that Knab has described another 

 mosquito, belonging to the section Metanototricha, which, having the 

 same habits as Dinocerites, has similar elongated antennas. 



2. Stegomyia Series. 



Stegomyia, Theobald. Head and scutellum covered 

 with imbricating squames, a clump of darts on the nape. 

 Clypeus scaly. Male palpi longer than proboscis. Small 

 black mosquitoes, usually with conspicuous snow-white 

 markings. 36 species, distributed all round the globe in 

 warm latitudes. 



Quasistegomyia, Theobald. Differs from Stegomyia in having some 

 squames on the after part of the scutum. 2 species ; Sudan and 

 Philippines. 



Kingia, Theobald. Differs from Stegomyia in having some flat round 

 squames in patches on the fore part of the scutum. 2 species ; Tropical 

 Africa and India. 



Scutomyia, Theobald. Differs from Stegomyia in having a few sickles 

 in the middle line of the head. 5 species ; Africa, Australia, and 

 Oriental Region. 



Gymnometopa, Coquillett. Differs from Stegomyia in having the 

 clypeus bare and some sickles on the scutellum. 4 species ; West Indies. 



Pseudocarollia, Theobald. Differs from Stegomyia in having some 



