. Fig. 39.—Platypeza argyrogyna, Meij., antenna. occiput ash-grey or bluish grey, with minute black bristles. In $ , Irons about one-quarter of head, with parallel sides, dark brownish grey, with very short yellow hairs; antennal 3rd joint yellowish, often more or less darkened at tip ; ocelli bright yellow. Thorax * Exceptionally with only six segments in some European species, t Some authors speak of the 4th vein as forked, the lower branch seldom reaching the wing-margin.

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1920, bookyear1920