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Macintosh Picture Format  |  1996-09-10  |  161.4 KB  |  640x310  |  8-bit (195 colors)
   ocr: but their range of distribution extends over the temperate zones into the Arctic and Antarctic, where they are often very troublesome. At present about three thousand species are known. The mosquitoes proper are distinguished from other small flies or "gnats" by their elongated mouth parts, venation of their wings, and by the presence on these of a fringe of slender, regularly arranged scales. The divisions of the body into head, thorax, and abdomen is obvious. Anteriorly the head bears the compound eyes, each consisting of several 317