18 HYMENOPTERA. 



grooved at their apex, furnished with fine stout teeth ; the cly- 

 peus carinated in the middle ; the head dehcately shagreened, a 

 little wider than the thorax and emarginate behind. The meso- 

 thorax with a central longitudinal slightly impressed line which 

 extends from base to apex ; a similarly impressed bent line is 

 situated half-way between the centre and the tegulae ; wings 

 fusco-hyaline, clearest towards their apical margins ; the nervures 

 fusco-ferruginous. The scale of the peduncle subquadi-ate, 

 rounded, and emarginate above ; the abdomen has a few scattered 

 short pale haii's, and the apical margins of the segments narrowly 

 rufo-piceous. 



Hab. India (Deccan). (Coll. East India House.) 



63. Formica impetuosa. 



Worker. Length 6 lines. — Opake-black, with the flagellum 

 and two apical joints of the tarsi ferruginous : head large, much 

 wider than the thorax, deeply emarginate behind ; the clypeus 

 with a central longitudinal carina, which is produced, and forms 

 a small tooth in the middle of the anterior margin, which is 

 straight. The head and thorax are delicately shagreened, the 

 latter elongate and compressed posteriorly; legs elongate, smooth 

 and shining, destitute of pubescence, or with a few short ferru- 

 ginous hairs on the tibiae at their apex beneath, and also a few 

 on the tarsi. Abdomen ovate ; the scale of the peduncle incras- 

 sate, narrow, rounded in front, and flat and perpendicular behind, 

 its margin slightly notched above. 



Hab. Bombay. (Coll. East India House.) 



64. Formica callida. 



Worker. Length 3-5 lines. — Very variable in colour : some in- 

 dividuals are black, with the flagellum, legs, thorax beneath, scale 

 of the peduncle, and base of the abdomen beneath more or less 

 feiTuginous ; other individuals have the head, thorax, scale of the 

 peduncle and legs pale ferruginous : the larger and smaller 

 individuals also vary in the relative proportions of the head and 

 thorax, but in all it is oblong-quadrate, with the angles rounded, 

 wider than the thorax and emarginate behind ; the clypeus with 

 a longitudinal carina in the middle ; a smooth abbreviated line 

 between the antennae. Thorax compressed ; legs elongate and 

 slender. Abdomen ovate ; the scale of the peduncle oblong, 

 narrowed to its base, and rounded above. 



Hab. India (Deccan). (Coll. East India House.) 



Probably the worker of F. compressa, being the small form of 

 that species. 



