30 Mr. F. Smith's Descriptions of new 



width before the eyes and narrowed behind tliem ; a central carina 

 on the clypeus ; the mandibles ferruginous; the extreme base of 

 the scape, the trochanters and tips of the coxa; pale testaceous; the 

 tarsi pale ferruginous. The scale of the peduncle incrassate, its 

 side view wedge-shaped ; its superior margin rounded ; the ab- 

 domen sprinkled with pale hairs. 



Formica striata. 

 F. nigra nitida ; antennis pedibusque rufo-tesfaceis ; tliorace 

 antice delicatule striate. 



^Vorker. Length \\ lines. Shining black; the head and ab- 

 domen smooth aod impunctate ; the thorax finely striated longi- 

 tudinally above, the sides striated, the stri^ curving round the 

 posterior portion of the metathorax ; the antennae and legs rufo- 

 testaceous ; the base of the scape, the coxae and trochanters pale 

 testaceous. Abdomen ovate; the scale of the peduncle incrassate, 

 its superior margin rounded. 



Forviica simiUima. 

 F. nigra, nitida ; thorace subtns, metathorace femoribusque 

 ferrugineis ; abdomine subnitido, basi ferrugineis. 



Female. Length 65 lines. Shining black ; the apical joints of the 

 antennsp, rufo-testaceous beneath. The thorax beneath, the coxae, 

 trochanters and femora, as well as the metathorax and scale of the 

 peduncle, ferruginous ; the apical joints of the tarsi ferruginous. 

 Abdomen sub-opake, the base ferruginous ; the apical margins of 

 the segments ciliated with pale fulvous hairs. 



This species very closely resembles the F. ligniperda of Europe, 

 the principal difference in it appears to be that the scale of the 

 peduncle is evenly arched above, not inclining to a point as in the 

 European insect. 



Formica corusca. 

 F. fusco-ferruginea, sericeo micans ; scapo pedibusque ferru- 

 gineis. 



Worker. Length 3 lines. Dark ferruginous, with patches of 

 glittering silky pile, changeable and only visible in certain lights ; 

 the abdomen thinly sprinkled with glittering pale erect hairs. The 

 anterior part of the head, mandibles, cheeks and scape of the 

 antennae bright ferruginous ; the head oblong, rather narrowed 

 in front ; the eyes round and rather prominent ; the clypeus with 

 a central longitudinal carina. The thorax oblong, narrowed pos- 



