OF INSECTS. 313 



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. 

 PLATE XXXI. Fig. 1. 



S. gigas, Linn. fern. ; Donov. vi. PI. 197, fern. S. marisca, 

 Linn. Male. 



THE structure of the oral organs in this genus has 

 been minutely delineated on PI. 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 ex- 

 tremity black ; the female black, with the second 

 and three last segments of the abdomen yellow. 



The larvae live in trees, to which they sometimes 

 prove very injurious. 



TREMEX COLUMBA. 

 PLATE XXXI. Fig. 2. 



Sirex columba, Linn. S. Pensylvanicus, De Geer, Mem. iii. 

 PI. 30, fig. 13. West. Drury, PI. 38, fig. 2. 



THIS species affords an example of the Siricidse 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 like- 

 wise tipped with yellow; legs orange brown. 



