108 



FORMICIDiE. 



auteiiiuil carina- short, parallel, close together ; eyes proportionately 

 large, lateral, situated a little to the front. Thorax elongate, 

 constricted in the middle, the sutures distinct, the metauotum 

 always raised, convex and conspicuous ; legs moderately long 

 and stout, the tibial calcaria pectinate, the claws simple. Pedicel 

 I'emarkably elongate, generally the anterior node and sometimes 

 the posterior node also is elongately petiolate, giving great flexi- 

 bility to the abdomen ; abdomen llarro\^•, more or less cylindrical, 

 attenuate at apex ; sting exserted. 



d & $. Very similar to the ^ and, beyond the sexual ditt'erences 

 of the build of the thorax, generally with a longer larger head in 

 the 2 ' and a smaller diamond-shaped head in the o , \\ith 13- 

 jointed antenna; in the latter ; fore wings with a radial, two closed 

 cubitals, and a discoidal cell. 



Key to the S^iecies. 



A. Ocelli present in ^ S. rufo)ii(/ra, p. 108. 



B. Ocelli not present in ^ . 



a. Head narrower posteriorly than in front. 



a'. Clypeus not bidentate S. binf/hami, p. 111. 



b'. Cl\^eus bidentate anteriorly S. birmana, p. 112. 



b. Head posteriorly as broad as in front, or 



broader than in front. 

 a'. First node of pedicel unarmed beneath. 

 (r. Petiole anteriorly of 1st node shorter 

 than node itself. 

 «•'. lu profile, metauotum not higher 



than pro-mesonotum S. aUaborans, p. 1 13. 



P. In protlle, metanotum distinctly very 



much higher than pro-mesonotum . *S'. aitkeni, p. IIT). 

 b-. Petiole anteriorly of 1st node as long- 

 as, but distinctly not longer than 

 node itself. 

 a^. First node as broad as second node . . S. j^etiolata, p. 113. 

 b^. First node much narrower than 



second node <S'. ?iH/ra, p. 1 10. 



c'-. Petiole anteriorly of 1st node distinctly 

 longer than node itself, 

 ft''. Eyes proportionately rather small, 

 placed closer to anterior than to 



posterior margin of head S. attenuata, p. 112. 



h\ Eyes proportionately very large, 

 placed closer to posterior than to 



anterior margin of head S.fergiisoni, p. 114. 



b' . First node of pedicel armed with a tooth 



beneath , S. lonf/iceps, p. 1 1.5. 



127. Sima rilfonigra, Jcvdon (Eciton), Madr. Jour. L. S. xvii (1851), 

 p. HI : id. A. M. X. H. (2) xiii (1854), p. 53. 



^ . Head, the 2nd joint of the pedicel and abdomen black ; the 

 mandibles, autenna3, thorax and 1st joint of the pedicel more or 

 less red, varying from liglit orange-red or orange-yellow to deep 



