372 Mr. F. Walker on some undescribed Ceylon Insects. 



brevissimo, abdomine elliptico, antice piceo, pedibus breviusculis, 

 alis cinereis, venis testaceis, stigmate nigro. 



Male. Testaceous, slightly shining, very finely and minutely 

 punctured. Head piceous above. Antennae filiform, much shorter 

 than the body ; scape very short. Abdomen elliptical, very little 

 longer than the thorax ; fore half piceous. Legs rather short. 

 Wings cinereous ; veins testaceous, in structure like those of Ta- 

 pinoma erratica ; stigma black. Length of the body %\ lines ; 

 of the wings 4 lines. 



Formica ingruens. Foem. Nigra, scitissime punctata, capite mag- 

 no, mandibulis tarsisque testaceis, antennis corporis dimidio non 

 longioribus, scapo longo subclavato, flagello rufescente subclavato, 

 abdomine lato brevi-elliptico, pedibus robustis breviusculis, alis 

 cinereis parvis, verris piceis, stigmate nigro. 



Female. Black, shining, very finely punctured. Head large ; 

 mandibles testaceous. Antennae about half the length of the body ; 

 scape subclavate, much more than half the length of the flagellum ; 

 the latter reddish, subclavate. Abdomen short-elliptical, very 

 much broader than the thorax. Legs short, stout ; tarsi testa- 

 ceous. Wings cinereous, narrow, short ; veins piceous, in struc- 

 ture like those of F. pang ens ; stigma black. Length of the body 

 2\ lines, of the wings 4 lines. 



Formica detorquens. Faun. Nigra, scitissime punctata, capite 

 parvo, antennis subfiliformibus corporis dimidio paullo longioribus, 

 scapo longo, abdomine elliptico, pedibus breviusculis, tarsis testa- 

 ceis, alis pallide cinereis, venis stigmateque testaceis. 



Female. Black, shining, very finely punctured. Head small, a 

 little more than half the length of the body. Antennae nearly 

 filiform ; scape much more than half the length of the flagellum. 

 Abdomen elliptical, hardly longer or broader than the thorax. 

 Legs short; tarsi testaceous. Wings pale cinereous; veins and 

 stigma testaceous ; the former in structure much like those of 

 Tapinoma erratica, but the discal areolet is open on the exterior 

 side. Length of the body If line ; of the wings 3 lines. 



Formica diffidens. Foem. Fulva, gracilis, aptera, capite nigro 

 elongato, mandibulis magnis fulvis, antennis fulvis subfiliformibus, 

 metathorace petioloque longis, abdomine nigro elliptico, pedibus 

 posticis piceis, tarsis posticis testaceis. 



Female. Tawny, slender, apterous. Head black, elongate. Man- 

 dibles large, tawny. Antennae tawny, nearly filiform ; scape 

 moderately long. Metathorax and peduncle long. Abdomen 

 black, elliptical, shorter than the thorax. Hind legs piceous ; 

 hind tarsi testaceous, long, slender. Length of the body 2 lines. 

 The description is taken from an injured specimen. 



Formica obscurans. Foem. Nigra, sat gracilis, scitissime punctata, 

 capite longi-quadrato, mandibulis magnis fulvis, antennis corporis 

 dimidio vix brevioribus, scapo longo subclavato, flagello fulvo sub- 



