228 The Fermentation of Cacao 
the abdomen being black and the antenne 
more plumose. 
The colour of the fly is a dusky brownish 
yellow, and the eyes a bright red to reflected 
light. The venation of the wings is simple, 
consisting of five longitudinal and two trans- 
verse veins, the latter cross between the second 
and third and the fourth and fifth longitudinals. 
The eggs are just visible to the naked eye ; 
they possess two curious prolongations, which 
are attached to an egg case, and this is 
easily removable (fig. 2, Cand J). The larve 
are amphipneustic (fig. 2, 7). 
The two following experiments show the 
action of these flies in conveying organisms 
to cacao :— 
(1) Four pods were taken, and two small 
areas at each end of them were sterilized and 
a small hole was drilled by a red hot iron. 
Into these holes sterile glass rods of an eighth 
of an inch bore were driven and moved freely 
about, so as to leave a small unoccupied space 
opposite their entrance on the inside of the 
pods. In two cases the ends of the rods were 
protected against the entrance of the flies by 
tying two or three fibres of thin cotton, over 
them. 
The four pods were now placed in a cage 
with a large number of these flies, which had 
been obtained from a number of places. On 
the next day they were seen crawling into the 
two unprotected tubes and thus into the pods. 
