Abstract
A study on the raiding behaviour ofE. burchelli (Westwood) andE. hamatum (Fabricius) was carried out in an Amazonian forest reserve at Instituto de Pesquisa e Experimentacao Agropecuarias do Norte (IPEAN), Belem, State of Para, Brazil. The data were collected during the years 1966 and 1968, on 5E. burchelli and 1E. hamatum colonies, with emphasis on the quantitative aspects (raid trail length, frequency and duration of raid activity, speed of workers on base column, booty types, and direction of raid trail). The average trail length was 75.4±3.3 m forE. burchelli, as calculated from 306 raid trails recorded during 24 nomadic phases; the figures forE. hamatum were 195±13.4 m, 54 and 5 respectively. A significant difference (0.01<P<0.05) was observed between the nomadic and statary phase, both forE. burchelli (308 records) andE. hamatum (72 records), with respect to raid trail length. The nomadic raids of both species are longer than those of the statary phase. The season of the year had a significant influence on raid trail length, but no relationship was found between raid trail length and the days of nomadic or statary phase. Data on worker speed on the raid trails, booty types and direction of the raid are also presented.
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