94 Mr. W. C. Crawley on new and 
as long as broad, joints 8-7 broader than long, the length ot 
all about equal, the breadth increasing with each joint, the 
eighth and ninth barely broader than long, and the ter minal 
joint equalling the four preceding ones. "The scapes reach 
the occipital border. 
Thorax somewhat similar to the description of goeldz, For., 
but broadest at pronotum, which is broader than long. 
Epinotum broader than long, in profile as high as mesonotum, 
the base rounded, the declivity teebly concave, much longer 
than base. 
Scale seen from front, flat, straight along the top, the sides 
sloping outwards slightly from the superior border, becoming 
broadest in the middle of the sides, thence narrowing to the 
base. Legs short and stout, gaster large and oval. 
Mandibles smooth and shining ; head subopaque, finely 
shagreened; thorax and gaster similarly shagreened, but 
Fig. 2. 
Fig. 2.—Head of Rhizomyrma marshall. 
Fig. 2a.—Funiculus of antenna of Rhizomyrma marshalli. 
more shining. Declivity of epinotum very smooth and 
shining. 
Barbadoes, 1914 (J. R. Bovell, no. 346). In soil round a 
sugar-cane root. 
I have named this species after my friend Dr. Guy 
Marshall, through whom the ant came into my hands. 
This genus, originally founded by Forel (Tr. Ent. Soe. 
Lond. lv. 1893, p. 347) as a subgenus of Acropyga, appears 
hitherto to have been unrepresented in British collections. 
Professor Emery, who kindly examined a cotype for me, 
points out that the head is much shorter in this species than 
in the other American species of which the % is known. 
Several species of this genus have antenne whose joints vary 
in number ; but not having had an opportunity of examining 
inany other species, I am unable to say Whether the str ucture 
of the second joint of the funiculus is unique in marshalli. 
