OF CERAM, CELEBES, TERNATE, AND GILOLO. 43 
angle, and a shorter acute spine outside at their base. (Pl. I. 
fig. 19.) 
Hab. Celebes (Tondano). 
21. Potyruacuis Hippomanss. P. niger; capite thoraceque opacis ; 
abdomine nitido; thorace spinis duabus longis acutis postice armato ; 
squama spinis duabus longis curvatis armata. 
Worker. Length 2} lines. Black, the head and thorax opake, and 
obscurely tinged with blue. Thorax rounded above, the anterior margin 
unarmed ; the metathorax with two long divergent spines; the node 
of the peduncle with two similar spines, which are curved and extend 
over the base of the abdomen; the trochanters and the intermediate 
and posterior coxz pale rufo-testaceous; the legs elongate. The 
abdomen globose. (PI. I. fig. 20.) 
Hab. Celebes (Tondano). 
22. Potyruacuis Lycipas. P. niger, pubescens; thorace supra de- 
planato, spinis duabus anterioribus ; petioli squamula quadrispinosa. 
Worker. Length 4 lines. Black with a thin silky cinereous pile, and 
sprinkled over with erect pale pubescence, which covers the antennz 
and legs also; the extreme tip of the antenne pale rufo-testaceous, 
the palpi of the same colour; the head and thorax longitudinally 
striated ; the prothorax with two stout acute spines; the margins of 
the thorax slightly elevated and extremely acute at the angles of the 
’ truncation of the metathorax, sub-dentate ; the node of the peduncle 
with four acute spines. Abdomen globose, with the base truncate. 
(Pl. I. fig. 21.) 
Hab, Celebes (Tondano). 
23. PotyrHAcHIS Zopyrus. P. niger; prothorace bispinoso ; petioli 
squamula quadrispinosa. 
Worker. Length 2} lines. Black, with a thin cinereous silky pile. 
Thorax, the anterior margin transverse, with the lateral angles very 
acute, and slightly produced into short acute spines; the sides of the 
thorax flat, the disk slightly convex, with the margins acute and 
slightly raised; the metathorax truncate, the angles of the truncation 
slightly produced, forming short acute spines; the anterior tibiae more 
or less ferruginous within. Abdomen globose, the node of the peduncle 
with the superior margin transverse, the lateral angles raised into short 
acute teeth or spines; the sides of the node oblique outwardly, then 
abruptly inclined inwards to its base ; at the angle thus produced is a 
short acute spine. (PI. I. fig. 22.) 
Hab. Celebes (Tondano). 
24. Potyruacuis Euryrus. P. niger cinereo-sericeo vestitus ; tho- 
race subovato, spinis duabus antice armato; squama emarginata. 
Female. Length 3} lines. Black, and covered with silvery grey pile, 
which is most dense on the face, metathorax, and abdomen. Thorax 
