50 HYMENOPTERA. 



The insect which we suppose to be the female of this species, 

 is from Santarem ; it very closely resembles the F. ligniperda ; 

 the flagellum, legs, thorax beneath, pale femiginous ; in some 

 specimens the metathorax is also pale, others have also the pro- 

 thorax pale, and two pale longitudinal stripes on the disk of the 

 thorax ; the base of the abdomen is usually pale, as well as the 

 basal segments beneath ; the wings hyahne, with a yellow tinge 

 at the anterior margin of the superior pan-, the nerviires pale fer- 

 ruffiuous. 



171- Formica bimaculata. 



Worker. Length 2} lines.— Black and shining, with a trans- 

 verse oblong white macula on each side of the second segment 

 of the abdomen at its base, sometimes the maculse form a slightly 

 interrupted fascia ; some of the large workers have the head red. 

 Head oblong, with the mandibles and antennse rufo-piceous ; 

 eyes rather large, prominent, and nearly circular. Thorax ob- 

 long, narrower than the head, compressed behind; the knees 

 and the tarsi rufo-piceous. Abdomen ovate, with a few scattered 

 glittering pale hairs ; the scale of the peduncle incrassate, narrow, 

 its margin above rounded ; the legs and antennae pubescent. 



The large worker only differs in being half a line larger, and 

 in having the head red. 



Hob. St. Vincent's. (Coll. F. Smith.) 



17'2. Formica albipennis. 



Formica albipennis, Fabr. Ent. Syst. ii. 554. 19. 



Latr. Hist. Nat. Fourm. 278. 

 Lasius albipennis, Fabr. Syst. Piez. 417- 



Hub. Island of St. Cruz. 



173. Formica ovaticeps. 



Formica ovaticeps, Spin. Faun. Chili, vi. 238. 3. 

 Hob. ChiU. 



174. Formica morosa. B.M. 

 Worker. Length 3 lines. — Opake black : the flagellum ferru- 

 ginous with the apex black. Head elongate, eyes ovate, placed 

 rather high on the sides of the head ; the mandibles ferruginous, 

 the clypeus v.ith a central longitudinal carina, the head rounded 

 behind. Thorax not quite so wide as the head, much com- 



