158 



small, round, rather flat. Thorax narrow ; pronotum rounded 

 anteriorly, pro-mesonotal suture tolerably distinct, mesonotum 

 very convex ; meso-metanotal suture deeply impressed ; the basal 

 portion of the metanotum passing into the apical portion by a 

 regular curve, and longitudinally channeled down the middle, 

 with the sides projecting posteriorly and triangularly at the 

 posterior lateral angles ; legs somewhat slender and long. Pedicel : 

 the 1st node squamiform, transverse, shortly petiolate anteriorly, 

 the petiole and front of node viewed in profile forming a regular 

 curve ; 2nd node from above transversely oval, broader than long ; 

 abdomen oval anteriorly, slightly truncate. 



. Eesembles the If. , but is, of course, much smaller, the 

 mandibles are 4-dentate ; the apical tooth long and acute, the pro- 

 mesonotal suture obsolete, thorax seen in profile emarginate at the 

 meso-metanotal suture. 



5 . Head as in the If , but the eyes larger and ocelli present, 

 the medial groove more feebly impressed, the antennae 11- 

 jointed. Thorax a little broader than the head, the mesonotum 

 long, gibbous in front, convex ; metanotum short, unarmed, the 

 basal portion oblique, the apical portion vertical. Pedicel as in 

 the Jf. , but shorter and more stoutly built, the 2nd node not so 

 thick above as in the 1j. , with the short petiole connecting it 

 posteriorly with the abdomen thicker ; abdomen more massive, 

 an elongate oval. Fore wing with one cubital and one discoidal 

 cell. 



3 . Eesembles the $ , but the head is smaller, the thorax 

 proportionately very much more massive and deeper. Head 

 short, very much broader in front than posteriorly ; mandibles 

 narrow, with three acute teeth, clypeus arched ; eyes and ocelli 

 large and very prominent ; antennae 12-jointed, the scape short, 

 about as long as the 2nd joint of the flagellum. Thorax : the 

 mesonotum extraordinarily convex and gibbous in front, entirely 

 suppressing the pronotum, which is greatly narrowed in front ; 

 scutellum very convex and raised higher than the mesonotum ; 

 metanotum unarmed, roundly sloped posteriorly. Pedicel much 

 as in the $ ; abdomen shorter, broadly oval. Wings as in the $ , 

 but the cubital cell in the fore wing broader and shorter. 



Key to the Species. 



$ $. 



. Length over 3 mm S. yeminata, p. 158. 



b. Length under 2 mm. 



a'. Reddish yellow ; head and thorax opaque, 



sculptured S. wroughtoni, p. 159. 



b'. Dark reddish brown ; head and thorax 



smooth, highly polished, shining S. nitens, p. 160. 



184. Solenopsis geminata, Fdbr. (Atta), Syst. Piez. 1804, p. 4:23. 

 TJ.. Keddish yellow; the mandibles dark reddish brown, the 



