HYMENOPTERA. 55 



colour than the head, the scape blackish, the flagellum red. The 

 thorax paler than the head, narrowed behind ; the apex of the 

 metathorax oblique ; the tibiae and tarsi slightly fuscous. Ab- 

 domen ovate, the base more or less ferruginous ; the entire in- 

 sect thinly sprinkled with long erect ferruginous hairs ; the scale 

 compressed, narrow, its margin entire. 



Worker minor. Length 3 lines. Of the same colour as the 

 larger worker ; the head proportionably narrower, more elongate- 

 quadrate ; otherwise, the same as the larger form. 

 Hab. Mexico. 



This species closely resembles F. Integra, but is at once dis- 

 tinguished by the form of the scale of the peduncle. 



19/. FORMICA L^VIGATA. B.M. 



Female. Length 7 lines. Black, smooth and shining ; closely 

 resembling F. herculanea, but differing in the form of the head, 

 which is rather larger, and, viewed in front, much more square, 

 the sides being parallel, not narrowest at the mouth ; the head 

 emarginate, wider than the thorax; the apex of the antennae 

 obscurely rufo-piceous. Thorax oblong-ovate ; the tips of the 

 joints of the legs and the apical joints of the tarsi ferruginous. 

 Abdomen ovate, the scale ovate, the margin entire. 



Worker. Length 5 lines. Black : head of the same form as 

 in the female, much wider than the thorax, the latter compressed 

 behind ; the legs nigro-piceous, the apical joints of the tarsi fer- 

 ruginous. Abdomen ovate, the scale ovate, the margin entire ; 

 the apical margins of the segments testaceous. 

 Hab. California. 



Genus 2. TAPINOMA. 



Formica, pt., Latr. Hist. Nat. Fourm. 182 (1802). 

 Tapinoma, Foerst. Hym. Stud. 43 (1850). 



Ocelli obliterated in the workers, present in the males and fe- 

 males ; the scale of the petiole flattened, decumbent, usually re- 

 ceived into an impressed fovea at the base of the abdomen ; the 

 thorax deeply impressed between the meso- and metathorax, the 

 latter obliquely truncated; wings as in the second division of 

 Formica. 



1. TAPINOMA ERRATICA. PL III. fig. 6. B.M. 



Formica erratica, Latr. Hist. Nat. Fourm. 182 . 



Nyl. Form. Fr. et d'Alger. 71. 



Formica glabrella, Nyl. Addit. Alt. Mon. Form. Bor. 38. 

 Tapinoma collina, Foerst. Hym. Stud. Form. 43. 



Schenck, Beschr. Nass. Ameis. 67. 



