350 



MODERN CLASSIFICATION OF INSECTS. 



Fig. 42. 



the name of Scolytid^.* (T^?^. 42. i. Scolytus destructor). The head 

 (^Jig. 42. 2.) is produced into a short rostrum ; the upper Hp is obsolete ; 

 the maxilloe very thin, broad, and spined at the internal margin ; the 

 maxillary palpi minute and conical ; the extremity of the tibiae hooked, 

 with the third tarsal joint bilobed. The body is oblong or cylindric, 

 convex and rounded above, with the head globular, and deeply im- 

 mersed in the thoracic cavity ; and the antennae (^fig. 42. 3.) have the 

 basal joint elongated, and the terminal joints form a more or less 

 solid oval mass. In the typical genus Scolytus, the body is sud- 

 denly and obliquely truncated at the extremity ; and in some species 

 (S. multistriatus Marsh., armatus Chevr., &c.) the second abdominal 

 segment is armed beneath with a flat horizontal tooth. This appears, 

 however, to be a sexual character. (See Ratzebui'g's Forst-Ins. 

 pi. 10.) 



* BiBLioGR. Refer, to the Scolytid^. 



Erichson, in Wiegmann, Archiv. fur Naturg. vol. ii. 1836. 8vo. (An abstract of 

 this memoir is published in the "Naturalist," December, 1836.) 



Ratzehurg, in Nova Acta Nat. Cur. vol. xvii. — Ditto, Die Forst-Insecten. 4 to. 

 Berlin, 1 837. 



Gutrin. Icon. R. An. Ins. pi. 40. 



Dalman, in Act. Holm. 1825. 



Bosc, in Journ. d'Hist. Nat. torn. ii. (Bostr. furcatus.) 



Wcstwood, in Trans. Ent. Soc. London, vol. i. (Hypothenemus. ) 



DaUhiger. Vollstand. Geschichte des Borkenkafers. 8vo. Weissenburg, 1798. 



Von Hagen. Uber die Veimeistungen der Borkenkafers, &c. 8vo. Gijtting. 1805. 



Krutzsch. Gebt die Borkcnkafer, &c. 8vo. Dresden, 1825. 



Von Begg. Der Borkenkafer in Gallizicn (Lieb. aufm. Forst-m. 2 band. Prag. 

 1827. 



