48 MR. F. SMITH ON HYMENOPTEROUS INSECTS 
red; the head much wider than the thorax and more shining; the 
metathorax much swollen and wider than the prothorax, swelling out 
on each side. Abdomen heart-shaped, palest at the base and shining. 
Hab. Celebes (Tondano), 
The swollen metathorax in this species, I apprehend, is a receptacle for 
saccharine fluid ; on each side is a small orifice, and beneath it, adhering to 
the thorax, are particles of crystallized masses, apparently formed of the 
fluid which has exuded from the receptacle. Two species from Sarawak, 
having similar formations, are described in the second volume of the ‘ Pro- 
ceedings of the Linnean Society.’ 
Fam. ATTIDA, Smith. 
Gen. Sotenopsis, Westw. 
1. Solenopsis cephalotes, Smith, Proc. Linn. Soe. iii. 149, 1. 
Hab. Celebes; Aru. 
The worker major of this species has the head greatly enlarged, that of 
the worker minor being of the ordinary size. 
2. SOLENOPSIS LABORIOSA.  S. ferruginea; capite maximo, longi- 
tudinaliter striato, postice transverso-striato; spinis metathoracis minu- 
tissimis. 
‘Worker major. Length 3 limes. Dark ferruginous, with the legs pale ; 
rufo-testaceous ; the head very large, twice as wide as the abdomen, 
in front and at the sides roughly striated, posteriorly delicately striated ; 
the sides of the head very slightly rounded, emarginate behind with a 
central impressed line running forwards and terminating opposite the 
eyes; the eyes very small and placed at the sides a little beyond the 
middle ; the vertex smooth and shining, with a few scattered fine 
punctures. Thorax sub-rugose, convex anteriorly and shining, behind 
constricted and narrowed; the metathorax with two short, erect, acute 
. spines. Abdomen smooth, shining and slightly pubescent. The 
mandibles have a single tooth at their apex. 
Worker minor. Length 1-2 lines. This form is of a much paler colour, 
the larger individuals having the abdomen fuscous, except at the ex- 
treme base ; in the smaller examples it is only fuscous at the apex; in 
large individuals the head is slightly striated in front, in small ones it 
is entirely smooth and shining; the head much smaller in proportion 
than in the worker major; the mandibles with two or three teeth on 
their inner margin. 
Hab. Celebes (Tondano). 
The different-sized workers were taken from the nest by Mr. Wallace. 
3. SOLENOPSIS PUNGENS. S. ferruginea; capite maxime longitudinaliter 
striato ; abdomine fusco (operaria major): rufo-testacea, levis, tota 
nitidissima nuda flagellis pedibusque pallescentibus (operaria minor). 
Worker. Length 2 lines. Ferruginous, the flagellum and legs pale 
ferruginous; the mandibles stout, finely punctured and with two 
