48 



MR. F. SMITH ON IIYMEN01>TER0US 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. ATTIDiE, Smith. 

 Gren. Solenopsis, Westw. 



1. Solenopsis cephalotes, Smith, Proc. Linn. Soc. hi. 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 lines. 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 witli two or three teeth on 

 their inner margin. 



llab. Celebes (Tondano). 



The different-sized workers were taken from the nest by Mr. Wallace. 



Solenoi'818 I'UNGENH. S. ferruginea ; capite maxime longitudinaliter 

 striato ; abdomine fuiCO {operaria major) : rufo-testacea, laivis, tota 

 nitidissima nuda flagellis pedibusque pallescentibus {operaria minor). 

 Worker. Length 2 lines. Ferruginous, the ilagellum and legs pale 

 ferruginous ; the mandibles stout, finely punctured and with two 



