III PROTECTIVE RESEMBLANCES AMONG ANIMALS 69 
species of Hesthesis run about on timber, and cannot be dis- 
tinguished from ants. There is one genus of South American 
Longicorns that appears to mimic the shielded bugs of the 
genus Scutellera. The Gymnocerus capucinus is one of 
these, and is very like Pachyotris fabricii, one of the 
Scutelleride. The beautiful Gymnocerus dulcissimus is also 
very like the same group of insects, though there is no 
known species that exactly corresponds to it; but this is not 
to be wondered at, as the tropical Hemiptera have been com- 
paratively so little cared for by collectors. 
Insects mimicking Species of other Orders 
The most remarkable case of an insect of another order 
mimicking a beetle is that of the Condylodera tricondyloides, 
one of the cricket family from the Philippine Islands, which 
is so exactly like a Tricondyla (one of the tiger beetles) that 
such an experienced entomologist as Professor Westwood 
placed it among them in his cabinet, and retained it there 
a long time before he discovered his mistake! Both insects 
run along the trunks of trees, and whereas Tricondylas are 
very plentiful, the insect that mimics it is, as in all other 
cases, very rare. Mr. Bates also informs us that he found at 
Santarem, on the Amazon, a species of locust which mimicked 
one of the tiger beetles of the genus Odontocheila, and was 
found on the same trees which they frequented. 
There are a considerable number of Diptera, or two-winged 
flies, that closely resemble wasps and bees, and no doubt 
derive much benefit from the wholesome dread which those 
insects excite. The Midas dives, and other species of large 
Brazilian flies, have dark wings and metallic blue elongate 
bodies, resembling the large stinging Sphegide of the same 
country ; and a very large fly of the genus Asilus has black- 
banded wings and the abdomen tipped with rich orange, so as 
exactly to resemble the fine bee Euglossa dimidiata,-and both 
are found in the same parts of South America. We have 
also in our own country species of Bombylius which are 
almost exactly like bees. In these cases the end gained by 
the mimicry is no doubt freedom from attack, but it has some- 
times an altogether different purpose. There are a number of 
parasitic flies whose larve feed upon the larvee of bees, such 
