. Diptera Brachycera. Brachycera. 308 SYHPHID^. Head about as broad as thorax, someuliat flaitened ; eyes bare, wide ajnirt in d', still more so in 5 ; frons iu J geneially sligbtly narroxAed about the middle; face lounded, very ])ubescent, iiioutb- border not prominent; antennae porrect, appir-ximate at base, 1st joint the longest, cylindrical, 2nd about one-fourfh as long as the 1st, broader at tip and longer on lower side, 3rd joint of irregular shape, longer tlian 2nd, but usually only as long as, or shorter than, 1st, upper side nearly flat, lower side gently rounded ; arista sub-basal, b
. Diptera Brachycera. Brachycera. 308 SYHPHID^. Head about as broad as thorax, someuliat flaitened ; eyes bare, wide ajnirt in d', still more so in 5 ; frons iu J geneially sligbtly narroxAed about the middle; face lounded, very ])ubescent, iiioutb- border not prominent; antennae porrect, appir-ximate at base, 1st joint the longest, cylindrical, 2nd about one-fourfh as long as the 1st, broader at tip and longer on lower side, 3rd joint of irregular shape, longer tlian 2nd, but usually only as long as, or shorter than, 1st, upper side nearly flat, lower side gently rounded ; arista sub-basal, bare, somewhat thickened. :Z7ior«.rsubqiiadi'ate, arched, with rather dense pubescence ; scLitellum rather large, in many species with two blunt tubercles or sjdnes near tlie tip. Abdomen about as long as thorax, rounded, well arched and curved down- ward ; 4th segment in <S nearly bait' the length of the abdomen, in 2 'Itli and 5th segments subequal, 5ih segment in S often very small, twisted sideways to the left so that the bulbous base. Fig. G5.—Microdon hellus, sp. nov., 5- of the large genitalia is pronn'nent, witli ap])endages concealed beneath the body. Legs sliort and thick, tarsi wide. Wings com- paratively short, venation recalling that of Evments, marginal cell widely open ; 3rd vein sinuous, with a stump of a vein projecting backwards nearly half-way across 1st posterior cell; latter closed a long distance from border of wing by the strongly recurrent tip of the 4th vein ; anterior cross-vein distinctly 1 elbre middle of discal cell; apical portion of 5th vein rectangular, nearly upright; anal vein slightly but distinctly curved at tip ; squamae large. liange. Europe, North and South Africa, Orient, Tasmania, North and South America. Life-history. That of M. mutahilis, L,, and of certain other European species is known. The larvae are so unlike those of any other insects that when first discovered they were acttially described as by two authors, writi
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Photo credit: © Paul Fearn / Alamy / Afripics
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1920
