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 3 , 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 Dynastidcc, 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 b 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 Sphceridiadce, 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 larvae are preyed upon by that of the Ho- 
riadce e 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. 
" Ahren's Fn. Eur op. i. 1. c Hor. Ent. 47—. 
11 Annulosa Javanica, 36. 
See the Rev. L. Guilding's admirable History of Xylocopa Te- 
redo and Horia (Cissites Latr.) maculata, Linn. Trans, xiv. 313—. 
