34 Mr. F. Smith's i>escrij)tions of new * 



This species is of the size and form of the British species Myr- 

 m'lca acervorum. Mr. Parfitt took specimens in a botanic garden 

 at Exeter, imported probably with Brazihan plants. 



Myrm'ica glaher. 



Operaria, — Rufo-testacea, Isevis, tota nitidissima^ nuda ; abdo- 

 mine apice fusco-nigro. 



Worker. Length 1| lines. Testaceous red, entirely smooth 

 and shining ; head wider than the abdomen, in some examples 

 considerably so, and having a rather deeply impressed line which 

 extends from the back of the head to the insertion of the antennse, 

 where it is faintly impressed ; the mandibles armed with several 

 black teeth ; the club of the antennse 2-jointed ; the eyes small 

 and black ; the head anteriorly and the base of the abdomen paler 

 than the rest of the body ; the metathorax without spines. 



Myrmica poUla. 



M. rufo-fusca, laevis, tota nitidissima, nuda ; mandibulis, an- 

 tennis pedibusque pallide rufescentibus. 



Worker. Length 1| lines. Rufo-fuscous, highly polished and 

 smooth; head rather large, oblong, widest in front; eyes very 

 small; antennse 10-jointed, the club 2-jointed. Thorax deeply 

 strangulated in the middle, the metathorax without spines. Ab- 

 domen truncate at the base; the petiole rather long, the first node 

 elevated above the second, its lateral appearance wedge-shaped ; 

 the second node globose. The mandibles, antennae, articulations 

 of the legs and the tarsi pale rufo-testaceous. 



Sub-family ATTID^. 



Genus fficoDOMA, Latr. 

 1. CEcodoma sexdeniata, Smith, Cat. Hym. pt. vi. (Formicidce), 

 p. 183, pi. X. fig. 15. 

 Formica sexdens, Linn. Syst. Nat. i. 964, 14. 

 Hab. Cayenne; Surinam ; Para; Rio; S. America; St. Vincent's. 

 Of this insect Mr. Strange writes, " Umbrella ant ; these ants 

 have very large companies ; they form beaten tracks through the 

 thickest herbage, along which two crowds passing in opposite 

 directions may always be seen. The one burdenless, the other 

 each carrying a piece of leaf. I have seen trees quite stripped of 

 their foliage by these ants. What do they use the leaves for? 

 The larger individuals appear to exercise a kind of authority over 

 the smaller ones and to do much less work." 



