Tremex
A genus of Sawflies, so closely related to Sirex (which see), and so similar in general appearance and habits, as to render a detailed account of the species unnecessary. This genus has not been met with in Great Britain; but one species (T. Columba), popularly known as the Pigeon Tremex, is destructive to the wood of Pear-trees, and also to Elms and Maples, in Canada and the United States, and may not improbably be introduced into Britain in trees from those countries. The female has the body about 1 1/2in. long, with the ovipositor extending nearly 1/2in. backwards. The wings have a spread of about 2 1/2in.; they are smoky-brown. The head and thorax are reddish-brown, with black markings; and the abdomen is black, with seven yellow cross-bars, each, except the first two, broken in the middle. The male is little more than half as large as the female, and the markings are less conspicuous, the body being reddish, varied with black, and the wings more transparent. Should this insect be accidentally imported, the measures to be employed against it are the same as those recommended under Sirex.