HYMENOPTERA. 177 



Head very largely developed, oblong, narrowest in front, deeply 

 emarginate behind ; the lateral angles rounded, and with a central 

 channel extending to the base of the clypeus ; the head is covered 

 with fine elevated carina?, between which are fine transverse reti- 

 culations ; the carinre are wide apart on the sides of the face, 

 but much closer in the middle. The thorax finely roughened, 

 with two short, erect, acute spines on the metathorax. Abdomen 

 ovate ; the extreme base pale rufo-testaceous. 



Hab. Singapore. 



This species closely resembles the Pheidole pusilla ; the small 

 worker is not more than a line in length, very smooth and shining, 

 pale rufo-testaceous, with the abdomen fuscous; the legs and 

 antennae are more elongate than in the larger form, and the head 

 is of ordinary size. 



17- PHEIDOLE CEPHALICA. PL IX. figs. 21-23. B.M. 



Worker major. Length '6 lines. Head black ; thorax, legs 

 and nodes of the peduncle ferruginous ; abdomen fusco-ferrugi- 

 nous. Head enormously developed, deeply emarginate behind, 

 with a central longitudinal channel extending to the base of the 

 clypeus; the face striated and ferruginous anteriorly; the man- 

 dibles and antennae ferruginous. The thorax narrowed behind, 

 and armed with two short acute spines at the lateral angles of 

 the verge of the truncation of the metathorax. Abdomen ovate. 



Worker minor. Length 2 lines. Head of the ordinary size, 

 narrowed behind ; the sides slightly fuscous ; the insect otherwise 

 is ferruginous ; the antennae and legs more elongate than in the 

 large worker, the thorax is also more elongate ; the metathorax 

 with two acute spines; the insect sprinkled over with short, 

 erect, pale hairs. 



Hab. Brazil (Tunantins). 



Genus 4. SOLENOPSIS. 



Solenopsis, Westw. Ann. fy Mag. Nat. Hist. vi. 86 (1841). 



Head very large, subquadrate, emarginate posteriorly, divided 

 above by a longitudinal central impressed line ; eyes small, lateral, 

 placed before the middle. Antennae 10-jointed, short and rather 

 slender, inserted forwards on the head in two deep foveae ; the 

 club consisting of two joints. Mandibles very stout, curved, 

 their apex oblique, not toothed. The labial, and also the max- 

 illary palpi, 2-jointed. Thorax much narrower than the head. 

 Abdomen with two nodes at the base, the first compressed, its 



