. Diptera Brachycera. Brachycera. 70 SYRPHID^. sott pubescence, as has also the thoracic dorsum. Abdomen longer than thorax, segments subequal in length except the very short last one in cT and the small anal segments in $ ; ranging in shape from a short oval to a long oblong, generally broader in ? ; yellow or pale spots or bands present in all species. Legs simple, slightly pubescent. Wings with typical Syrphine venation ; anterior cross- vein before middle of discal cell, 3rd vein normally almost straight; alulae and squamae of moderate size. Wings folded over abdomen at rest. Life-Mstory,
. Diptera Brachycera. Brachycera. 70 SYRPHID^. sott pubescence, as has also the thoracic dorsum. Abdomen longer than thorax, segments subequal in length except the very short last one in cT and the small anal segments in $ ; ranging in shape from a short oval to a long oblong, generally broader in ? ; yellow or pale spots or bands present in all species. Legs simple, slightly pubescent. Wings with typical Syrphine venation ; anterior cross- vein before middle of discal cell, 3rd vein normally almost straight; alulae and squamae of moderate size. Wings folded over abdomen at rest. Life-Mstory, The larvae feed on Aphides, the metamorphoses of several European species being known *. Range. Fig. 16.—Si/rjyhus confrater, Wied., (^. The typical genus of the family, forming the centre of a group containing Didea, Platychirus, Melanostorna, Pyrophcena, Cliilosia and allies, and some othei's. Lasiopticus^ Eond., and Ischyro- syrphus, Big., are recognised as distinct, though they do not strongly appeal to me as such. Some confusion has arisen over the synonymy of the genus which is lucidly explained by Verrall f. This author also records two swarms (consisting of more than one species) that occurred in England in 1869, simultaneously at two places. The genus occurs almost everywhere, though its natural home seems to be Europe. De Meijere gives some valuable notes on the Oriental species, with a table (Tijd. v. Ent. li, p. 291 ei seq.). Table of Species. 1. Eyes pubescent 2. Eyes bare 10. 2. Two definite greyish stripes on anterior part of thorax (less distinct in serarius) . 3. No such obvious stripes; at most, traces in individuals 4. 3. A black facial stripe ; grey thoracic stripes more distinct albostriatns,Fln., p. 72. No facial stripe; grey thoracic stripes less distinct serarius, Wied., p. 73 * See p. 25 and footnote to p. 26. t Brit. '. SyrpliidiP, p. 3^ Please note that these images are extracted from scanned page images that may have been digi
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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1920
