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Rh volume of Transactions of the Zoological Society, Mr. Newport's Essay, Curtis' Brit. Ent. fol. 617, and in the Quarterly Journal of Agriculture.

SIREX GIGAS. XXXI. Fig. 1.

S. gigas, Linn. fem.; Donov. vi. Pl. 197, fem. S. marisca, Linn. Male. structure of the oral organs in this genus has been minutely delineated on Pl. XXVI. The group is a very distinct one, and contains about half a dozen of very conspicuous British species. S. gigas is rare, but is found occasionally in the more southern counties of England, generally frequenting pine woods. The abdomen of the male is yellow, with the hinder extremity black; the female black, with the second and three last segments of the abdomen yellow. The larvæ live in trees, to which they sometimes prove very injurious.

TREMEX COLUMBA. XXXI. Fig. 2. Sirex columba, Linn. S. Pensylvanicus, De Geer, Mem. iii. Pl. 30, fig. 13. West. Drury, Pl. 38, fig. 2. species affords an example of the Siricidæ of the New World, it being a native of the country round New York and other parts of North America. The head and thorax are brown orange; abdomen cylindrical, black, with five broad yellow bands, the hinder one interrupted; apex of the abdomen likewise tipped with yellow; legs orange brown.