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, fem. S. marisca, 
Linn. Male. 
The structure of the oral organs in this genus has 
been minutely delineated on PI. XX YI. 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 binder ex- 
tremity black ; the female black, with the second 
and three last segments of the abdomen yellow. 
The larvsc live in trees, to winch 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. 33, fig. 2. 
This species affords an example of the Siricidae 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. 
