280 Mr. F. Smith's Revision of 



very small, placed rather forward on the sides of the head ; the 

 meso- and metathorax with a deep strangulation between them ; 

 the spines on the metathorax minute and acute ; the petiole of 

 the first node of the abdomen elongate, slender and rugose ; the 

 second node globose. 



Female. — Length 2^ lines. Closely resembles the worker in the 

 form of the head, but has the eyes larger and the ocelli distinct 

 on the vertex ; thorax elongate-ovate, not so coarsely sculptured 

 as in the worker ; the wings hyaline, the nervures pale testaceous ; 

 abdomen rather more elongate, but with a similar long petiole to 

 the first node as in the worker, in colour precisely similar. 



This species is described in my Essay as the M. graminicola of 

 Latrielle. The minute eyes and elongate petiole sufficiently dis- 

 tinguish it ; it is rare, but I have occasionally taken specimens 

 in and about London ; ' the female is met with very late in the 

 season: I took it at the end of October, and Mr. Wing once 

 brought me a winged specimen he had just taken in his garden 

 at Lambeth on the 9th of December ; Mr. Reading of Plymouth 

 also met with this species in Devonshire. 



Subdivision 3. (Leptothorax, Mayr.) 



The maxillary palpi 5-jointed ; the labial palpi 3-jointed ; the 

 female and worker nearly of the same size ; the anterior wings 

 with one marginal, two submarginal, and one discoidal cell ; the 

 second submarginal sometimes semi-complete ; the pubescence 

 on the female and worker subclavate, or gradually tapering to 

 the base of the hairs ; the club of the flagellum 3-jointed. 



Sp. 8. Myrmica acervorum, Fabr. 

 Myrmica acervorum, Zett., Nyland., Foerst., Smith. 

 Myrmica graminicola, Latr. Hist. Nat. Fourm. {yar. worker.) 



Sp. 9. Myrmica Nylanderi, Foerst. 

 Myrmica Nylanderi, Foerst. Hym. Stud. Form. (1850.) 

 Myrmica cingulata, Schenck, Nass. Ameis. p. 104. (1852.) 

 Nyland, Form. Fr. et d'Alger. p. 93, 20. 

 Myrmica imrvula, Schenck, Nass. Ameis., pp. 103, 140. 

 Leptothorax Nylanderi, Mayr, Form. Austr. p. 175, 11. 

 Leptothorax parvulus, Mayr, Form. Austr, p. 176, 12. 



