1922] BAILEY—ANT-PLANTS 379 
pedicellis tenuibus 5-17 mm. longis gestae et in spatha castanea 
griseo-tomentella fusiformi ad basin constricta 14-16 cm. longa 
inclusae. Amentae 2 4 rectae rigidae vel apice paullo curvatae 
cylindricae ante anthesin 9-12 cm. longae 7-8 mm. crassae (tardius 
13-17 cm. longae 11-13 mm. diametro) in pedicellis crassis confer- 
ruminatis 3-7 mm. longis gestae et in spatha castanea griseo- 
tomentella quadrangulata obtusa 10-12 cm. longa inclusae. Ped- 
unculi argute asperati compresso-cylindrici, $ 9-12 cm. longi 8-11 
mm. crassi, ? 8-10 cm. longi 7-10 mm. crassi. Perigonia ¢ clavata 
_pentangularia vel hexangularia 2-3 mm. longa, filamentis in maturi- 
tate membranaceis 0.5-1.4 mm. longis 0.3—0.5 mm. latis, antheris 
caudatis 0.8-1.0 mm. longis 0.4-0.5 mm. latis. Perigonia ? pen- 
tangularia vel hexangularia cum albido tomento vestita ad anthesin 
1.5-2.0 mm. longa deinde usque ad 3.0-3.5 mm. elongata. Stylus 
cylindricus ovarium aequans vel eo longior. Stigmata comosa. 
Fructus maturus furfurosus rubidus 2.0-2.5 mm. longus. 
Kartabo region, British Guiana: J. W. Bailey (1920), nos. 3, 4, 5, 6, 8, 
9, 14, 15, and 17; Kangaruma, British Guiana: H. A. Gleason (1921), no. 198. 
The fistulose stems of Cecropia angulata are inhabited by four 
distinct species of Azteca; a majority of the plants are colonized 
by a black species, A. constructor Emery, a considerable number by 
a yellowish species, A. alfaroi Emery, and an occasional isolated 
individual by either A. imstabilis F. Smith or A. érigona subsp. 
mediops Forel. The following observations upon the habits of 
the guest ants are based upon a study of the first two species. 
Of the coccids which are associated with Azteca, Pseudococcus 
rotundus Morrison is the commonest species. Akermes quinquepori 
Newstead and Pseudococcus bromeliae Bouché are of more or less 
sporadic occurrence. 
Are Cecropias protected by their guest ants? 
In studying the remarkable leaf cutting and fungus growing 
habits of the neotropical Attine ants, BELT (2) became much 
impressed by the efficiency of these insects in defoliating large 
numbers of native and introduced plants, and he was led to wonder 
how tropical vegetation has survived their devastating attacks. 
He inferred that the leaves of many plants are distasteful to the 
