1931 ] Camponotus (Myrmepomis) sericeiventris 89 
all this striking mimetic resemblance disappears under a 
high magnification like that of the photographs. (Figs. 
1 and 2.) 
The literature contains references to several other ant- 
mimicking Cerambycids. Belt, 1 who was one of the first 
to notice such forms, says that “amongst the longicorn 
beetles of Chontales, Mallocera spinicollis, Neoclytus 
Oesopus and Diphyrama singularis Bates, all closely re- 
semble stinging ants when moving about on fallen logs.” 
Bedel 2 in 1885 described a small longicorn as Pseudo- 
myrmeceon ramalium, taken in Eastern Algeria on the 
twigs of Quercus Mirbecki D. R. in company with workers 
of Crematogaster, very probably S. scutellaris Oliv., which 
it closely resembles in size and coloration. Bedel remarks 
that the beetle’s “form, coloration and gait give it, when 
alive, a singular resemblance to the ants of the genus Cre- 
matogaster, and since it is commonly found in their midst, 
it is easily confounded with them.” Our North American 
fauna also contains a number of Cerambycids, notably 
species of Clytanthus, Euderces, Cyrtophora and Tillo- 
morpha, w T hich resemble ants in size, shape, coloration and 
behavior. The resemblance is very striking in two other 
forms, Cyrtinus pygmseus Haldem., which occurs on dead 
wood among small ants, such as Lasius americanus Emery, 
and the Carolinian Michthysoma heterodoxum Lee., which, 
in life, according to Beutenmuller, extraordinarily resem- 
bles small workers of the carpenter ant, Camponotus penn- 
sylvanicus Deg. 
The following table may serve in identifying the workers 
of the various subspecies and varieties of C. sericeiventris: 
Appressed pubescence on body yellowish gray, or pale 
golden yellow, at the posterior borders of the gastric 
segments strongly converging to the mid-dorsal line; 
head of maxima worker longer than broad, its sides 
only feebly convex, slightly shining, rather densely 
and finely punctate ; pronotal spines acute, longer than 
broad in all the worker forms 
subsp. sericeiventris Guerin, 2 
1 The Naturalist in Nicaragua, London, 1874, p. 315. 
2 Ann. Soc. France, 1885, p. cxxxi. 
