446 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Mesonotum pyriform, flattened behind, with a feeble transverse im- 
pression at middle and a longitudinal impression in front, the sides 
slightly margined posteriorly. Epinotum in profile rather flat above; 
its base about twice as long as declivity, into which it passes at a broad 
rounded angle; surface of base broadly concave, that of declivity 
flat; base of declivity with broad, ear-shaped tubercles. Petiole one 
and a half times length of postpetiole, without anteroventral tooth; 
the node in profile as deep as broad, concave in front, rounded behind, 
with a constriction near apex. Postpetiole broader than petiolar 
node, rounded above, the anterior surface nearly straight; antero- 
ventral border angulate in front, but without distinct tubercle or 
tooth. Legs long and slender. 
Gaster shining, sparsely, regularly punctate; rest of body and the 
legs subopaque.. Head and thorax rugulosely punctulate, a median, 
longitudinal surface on the front less so and more shining than the 
rest; front of head between frontal carinae and eye concentrically 
striolate. Mandibles shining, coarsely striate. Epinotum and petio- 
lar node transversely striolate; postpetiole rugulose like the front 
of head. Body and legs everywhere with abundant erect hairs. 
Mandibles, funiculus, and antennal scapes with semierect hairs, last 
four funicular joints pubescent. 
Color light ferruginous, pile and pubescence yellow. 
Female (deilated). Length 6.5 mm. 
Closely resembling the worker. The white ocelli are small, but 
distinct. The smooth surface on the front is shorter but more dis- 
tinctly shining than in the worker. 
Described from a single female and several workers found at Porto 
Velho. This species is near M. cheringi Forel, from which it differs 
in its larger size, the head more constricted behind, in the much 
larger size of the eye, and in the subopacity of the tegument, which in 
M. theringi is shining. 
111. Tranopelta gilua Mayr. var. albida, var. nov. 
Several workers of a small variety of Tranopelta gilua Mayr were 
taken at Camp 39, Madeira-Mamoré R. R. These differ from 
var. brunnea Forel, the only form of which the worker is known, in 
the smaller size (length 1.5 mm.) and in the uniformly pale color 
which in the series before me is almost white, with a faint tinge of 
yellow. 
