GEOGRAPHICAL DISTRIBUTION OF INSECTS. 503 



recorded species found in Europe out of Spain. La- 

 treille says, that all the large species of this genus are 

 equinoctial: but C. Tmolus, described and figured by 

 Fischer a , found in Asia near Orenburg, north of 50 N.L., 

 is as big as C. Gigas or bucephalus. Another dominant 

 group of Petalocera, remarkable for the bulk and arms 

 of its tropical species, are the mighty Dynastida, the 

 giants and princes of the insect race. Though their 

 metropolis is strictly tropical, yet the scouts of their host 

 have wandered even as far as the south of Sweden, where 

 one of them, Oryctes nasicornis, is extremely common. 

 O. Grypus^ and some other species are found in South 

 Europe ; but though in a torpid state they can endure 

 unhurt the severity of a Scandinavian winter, they cannot 

 when revived stand the cold that often pinches Britons 

 in the midst of summer, and therefore are unknown in 

 our islands . The Sphtfridiadte, whose metropolis is 

 within the northern temperate zone, extend from thence 

 beyond the line, since Dr. Horsfield found two species 

 in Java d . It is probable, indeed, that this group is pre- 

 dominant. Some dominant groups begin at a lower la- 

 titude. Of this description are the carpenter-bees (Xylo- 

 copa\ whose lai'vae are preyed upon by that of the Ho- 

 riadce* under two forms, which extend from the tropics 

 to about 50 N. L. Others are not common to both 

 worlds. Thus, while Cantharis is the gift of PROVIDENCE 

 to America as well as the old world, Mylabris is con- 



a Entomogr. Russ. Coleopt. t. xiii./. 1. 

 b Ahren's Fn. Europ. i. 1. c Hor. Ent. 47. 



d Annulosa Javanica, 36. 



< See thf Rev. L. Guilding's admirable History of Xylocopa Te- 

 redo and Horia (Cissites Latr.) maculata, Linn. Trans, xiv. 313 . 



