1/6 HYMENOPTERA. 



the latter narrowed behind, and deeply strangulated between the 

 meso- and metathorax, the latter armed with two acute spines, 

 and obliquely truncate. Abdomen ovate ; the first segment with 

 a number of fine longitudinal carinas, which intermingle at its 

 base, but run parallel at its apex ; the following segments more 

 faintly carinate. 



Hah. Ceylon. 



14. Pheidole Silenus. B.M. 



Worker. Length 2^—4 lines. — Obscure fusco-ferruginous, with 

 the antennae, articulations of the legs and the tarsi, pale rufo-tes- 

 taceous. Head very large, nearly quadrate, with the hinder an- 

 gles rounded, the posterior margin deeply emarginate, the face 

 longitudinally striated, the hinder portion of the vertex trans- 

 versely so, with a rugose space between these striations ; the 

 head beneath has a much finer longitudinal striation ; the cly- 

 peus and mandibles shining, the latter punctured, with their base 

 striated. Thorax rugose, with the scutellum elevated, forming 

 an obtuse rounded tubercle; the anterior margin of the pro tho- 

 rax with a short obtuse tooth at its lateral angles, and the meta- 

 thorax armed with two upright stout acute spines. Abdomen 

 ovate and shining, the base delicately and closely striated, the 

 nodes of the peduncle roughened. 



Hah. Singapore. 



This is probably one of those species which should fall into the 

 genus Solenopsis, which has only two joints in the labial and 

 maxillary palpi, and two joints in the club of the antenna. 



15. Pheidole comata. B.M. 



Worker. Length 3^^ lines. — Fusco-ferruginous: the flagellum 

 and legs pale rufo-testaceous. Head oblong-quadrate, deeply 

 notched at the vertex, with a deep longitudinal channel extend- 

 ing to the base of the clypeus ; the head longitudinally reticu- 

 late-striate, and enormously enlarged. Thorax narrowed behind, 

 and armed with two short acute spines on the metathorax. Ab- 

 domen ovate and very delicately reticulated, with a number of 

 little raised ])oints, on each of which is a long pale hair ;• the 

 head, thorax and legs thinly covered with long pale hairs. 



Hah. Borneo (Sarawak). 



16. Pheidole, ferven.s. B.M. 



Worker. Length 2 lines. — Ferruginous : the flagellum, legs, 

 metathorax, and nodes of the abdomen, pale rufo-testaceous. 



