258 
DARWINISM 
CHAP. 
found at C’hontales. The pretty longicorn, Callia albicornis, 
closely resembles two species of malacoderms (Silis chaly- 
beipennis and Colyphus signaticollis), all being small beetles 
with red head and thorax and bright blue elytra, and all 
three have been found at Panama. Many other species of 
Callia also resemble other malacoderms; and the longicorn 
genus Lycidola has been named from its resemblance to 
various species of the Lycidse, one of the species here figured 
(Lycidola belti) being a good mimic of Calopteron corrugatum 
and of several other allied species, all being of about the same 
size and found at Chontales. In these cases, and in most 
others, the longicorn beetles have lost the general form and 
aspect of their allies to take on the appearance of a distinct 
tribe. Some other groups of beetles, as the Elateridge and 
Eucnemidge, also deceptively mimic malacoderms. 
Wasps and bees are often closely imitated by insects of 
other orders. Many longicorn beetles in the tropics exactly 
mimic wasps, bees, or ants. In Borneo a large black wasp, 
whose wings have a broad white patch near the apex (Myg- 
nimia aviculus), is closely imitated by a heteromerous beetle 
(Coloborhombus fasciatipennis), which, contrary to the general 
habit of beetles, keeps its wings expanded in order to show 
the white patch on their apex, the wing-coverts being reduced 
to small oval scales, as shown in the figure. This is a most 
remarkable instance of mimicry, because the beetle has had to 
acquire so many characters which are unknown among its allies 
(except in another species from Java)—the expanded wings, 
the white band on them, and the oval scale-like elytra. 1 
Another remarkable case has been noted by Mr. Neville 
Goodman, in Egypt, where a common hornet (Vespa orientalis) 
is exactly imitated in colour, size, shape, attitude when at 
rest, and mode of flight, by a beetle of the genus Laphria. 2 
The tiger-beetles (Cicindelkke) are also the subjects of 
mimicry by more harmless insects. In the Malay Islands I 
found a heteromerous beetle which exactly resembled a 
Therates, both being found running on the trunks of trees. 
A longicorn (Collyrodes Lacordairei) mimics Collyris, another 
genus of the same family; while in the Philippine Islands 
1 Trans . Eat. Soc., 1885, p. 369. 
2 Proc. Cambridge. Phil. Soo., vol. iii. part ii., 1877. 
