124 Mr. Smith's Essay on the Genera and 



female, but frequently paler, the legs being usually so ; the head 

 subquadrate, much wider than the thorax, and longitudinally striate, 

 the mandibles and antennae as in the female ; the vertex is slightly 

 concave behind, the angles being rounded ; the thorax a little 

 longer than the head, widest in front, finely longitudinally rugose- 

 striate ; the metathoracic spines short and acute ; the nodes 

 smooth and shining above, faintly strigose at the sides ; the legs 

 and abdomen as in the female. 



il/a/e. — Length Sg — 3-lines. Dark fuscous, or black; head 

 small, much narrower than the thorax, sub-opaque, longitudinally 

 rugose-striate, ocelli glassy and bright ; the mandibles, antennae, 

 joints of the legs and the tarsi, pale testaceous, the flagellum fuscous 

 at the base. Thorax rounded and swollen anteriorly ; on each side 

 anteriorly is an oblique impressed line, meeting in the middle of 

 the mesothorax ; the angular shape thus formed is highly polished 

 and impunctate ; on each side before the insertion of the wings, 

 about half-way between that and the oblique line, is an abbreviated 

 impressed line ; the centre of the thorax behind the angular shape 

 in front is longitudinally striated ; a shining space on each side 

 surrounding the lateral impressed line ; the scutellum transversely 

 and very finely strigose ; the metathorax longitudinally striate ; 

 wings hyaline, the stigma pale fuscous ; the nodes obsoletely 

 rugose. Abdomen ovate, smooth and shining ; the apical margins 

 of the segments pale rufo-testaceous. 



The antennae of the male have apparently only ten joints, but 

 when viewed under a high power of the microscope, the third 

 joint will be found to consist in reality of three joints; the fifth is 

 composed of two, thus making the number really thirteen. 



This is a local but abundant species on many parts of the coast; 

 it appears to frequent such situations, I have not found it in any 

 other; it is very plentiful at the back of the Isle of Wight, in San- 

 down Bay, Luccomb and Shanklin Chines ; there are large colo- 

 nies at Shoeburyness, below Southend, where in August I ob- 

 tained all the sexes : Mr. Dale has taken it at Charmouth. I 

 have little doubt of this being the F. ccespitum of Linnaeus, as 

 quoted by Latreille ; it is certainly that of the latter author. 



Sp. 8. Myrmica acervorum. 



Fcermna. — Sordida, pallide rubida, sparse pilosula ; capite, tho- 

 race abdomineque fusco-nigricantibus supra; capite longitudi- 



