494 GEOGRAPHICAL DISTRIBUTION OF INSECTS. 
to belt the globe, but not under one form. The types of 
the genus are the vast African Goliaths(G. giganteus, &c.), 
which, as well as G. Polyphemus, and another brought 
from Java by Dr. Horsfield, have, like Cetonza*, the sca- 
pulars interposed between the posterior angles of the 
prothorax and the shoulders of the elytra: while the 
South American species (G. micans, &c.) have not this 
projection of the scapulars ; in this resembling Trichzus. 
Mr. MacLeay further observes, that the female of the 
Javanese Goliathus is exactly a Cetonia, while that of the 
Brazilian is a Trichius. But quiescent groups have not 
generally this ample longitudinal range. Thus, Eu- 
glossa ¥F., in both its types,—one represented by Ew. cor- 
data, and the other by Eu. surinamensis,—is confined to 
the tropical regions of America. Doryphora, likewise 
American, seems equally confined. Asida, though a 
southern genus, is not found to enter the ¢ropics; and 
Manticora and Pneumora are in nearly the same predica- — 
ment. 
Under the present head we may consider what may 
perhaps be denominated without much impropriety en- 
demial groups; by which I mean those groups that are 
regulated, as to their limits, not so much by the tempera- 
ture, or the northing and southing of the latitude, as by 
the general aspect and circumstances of the country. 
Thus, the vast and nearly insular continent of Africa, 
almost as wide as it is long, and situated in or near the 
tropics, instead of inland seas or sea-like rivers, is inter- 
sected by parched sandy deserts, extending far and wide; 
circumstances which, though in the vicinity of its streams 
it is humid, impart an unusual degree of aridity as well 
* Vor. TI. p. 564. 
