1931 ] Camponotus ( Myrmepomis ) sericeiventris 87 
major and has shining sides. I have seen the females of 
some of the forms, but the male is still unknown. 
The typical sericeiventris, originally described from Rio 
de Janeiro, is less widely distributed than has been sup- 
posed. It occurs in Brazil, Paraguay, Uruguay and portions 
of the Argentine, but I have seen no specimens from the 
Guianas or Venezuela. It is recorded also from Peru, Ecua- 
dor, Colombia and Mexico, but the specimens in my collec- 
tion from these countries, like those from Panama and 
other Central American localities, have more brilliantly 
colored appressed pubescence and represent a distinct va- 
riety which I have called satrapa. I suspect that Forel has 
identified some of them as belonging to rex. The typical 
form of this beautiful subspecies occurs in Central Amer- 
ica, especially Guatemala, but has varieties in Honduras 
and Mexico. All the records I have been able to find 
are cited under the descriptions of the various forms. 
Colonies of sericeiventris and rex are fairly populous. 
They nest in decayed portions of standing tree-trunks some 
distance above the ground. I have found several such 
nests, usually in mango or Celtis trees, in Panama, Costa 
Rica and Guatemala. The workers are very aggressive and 
the maximse are able to bite severely. The smaller workers 
are often seen ascending and descending the trunks of trees 
even in bright sunlight. Occasionally this ant is introduced 
into the United States on fruit boats. Mann found speci- 
mens of sericeiventris in a restaurant at Palo Alto, Cali- 
fornia, and I have received two specimens of rex, taken 
by Mr. F. M. Schott in New York City on a boat from 
Panama. In both cases the specimens probably arrived as 
stowaways in bunches of bananas. 
Some years ago Dr. J. Bequaert gave me several peculiar 
Cerambycid beetles which he had taken June 4, 1924, on 
tree trunks at Prieta, Honduras, in company with workers 
of C. sericeiventris rex var. semirex. The beetles so closely 
resemble the ants that they may be regarded as highly 
mimetic. In an article in the present number of Psyche, 
Dr. W. S. Fisher has described the beetle as Eplophorus 
velutinus sp. nov., and I have inserted below a photograph 
made by Dr. F. M. Carpenter (Fig. 2). The beetle’s body 
