William M. Mann.
The Stanford Expedition to Brazil, 1911. Note on a Guest of Eciton hamatum Fabr.
Psyche 19(3):98-100, 1912.

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98 Psyche [June
THE STANFORD EXPEDITION TO BRAZIL, 1911. J. C. BBANNER, Director.
NOTE ON A GUEST OF ECITON HAMATUM FABR.
Bussey Institution, Harvard University.
In 1908 Dr. Nils Holmgren described as Mimop~ia ecitonophila, a remarkable wingless Proctotrupid which was taken with a col- umn of the legionary ant, Eciton hamatum Fabr., at Chaquimayo, Prov. de Carabaya, in Peru.'
In September, 1911, at Porto Velho, on the Rio Madeira, in Brazil, I had opportunity to observe living specimens of this inter- esting ecitonophile. The host ant was one of the most abundant in that vicinity and almost certainly to be found during a morn- ing's walk through the woods. It travels in immense armies and the large size and bright color of the individuals make the columns very conspicuous. One extraordinarily large army remained in one circumscribed locality in the woods near Porto Velho for two days, during which time one could walk scarcely a dozen yards along the trail without meeting individuals. Small columns were seen ascending the highest trees, and returning laden with the larvae, pupse, and even adults of other ants, from arboreal nests that they had raided. It was interesting to note that they brought down adults of Dolichoderus lugens, while other adult ants, as Cryp- tocerus, were not molested, and the Cremastogasters were always avoided, even when encountered by a column. Unlike some of the other Ecitons, hamatum is readily observed. The species travels above ground, often using the top of a log as a runway, and at such times one could sit by the log and watch the column quite comfortably, the only drawback being the fran- tic haste with which the ants marched along. The only other ob- jection one could have to hamatum was the scarcity of guests. I watched many columns before finding any iniquilines. This was very disappointing, for many Ecitons are known not only to be 1 her einige myrrnecophile Insekten aus Bolivia uad Peru. Zoolog. Anzeiger. Bd. XXXIII No. 11, p. 337-349
Psi& 19:W-99 (1912). hup #psyche rim:Iuborgl19I19-W8 html



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lor. After an interval of several minutes another followed. . is for some reason stopped. It was immediately surrounded Ecitons feeling of it with their atttennse. Then one, a medium er,'seized it by the thorax and resumed the a extending backward beneath its body.
the Proctotiupid had been taken as prey, 01lecting'bottle"it was seen to be uiimjured. Man
the Edtons were carrying- object^, generally dead .insects an t pup, and by watching the column in profile, I found tw <iÌö Mimoprigs that were being carried in the same manner ter, at another camp- further up the river, I found an men with an army of the same ant species. From




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