172 BRITISH ANTS. 



of the segments of the gaster reddish yellow. The articulation of the legs is often 

 lighter. 



Head longitudinally striate. Thorax longitudinally striate ; mesonotum 

 smooth and shining anteriorly, but with a few large scattered punctures ; 

 scutellum smooth and shining. Petiole and post-petiole broader proportion- 

 ately than in the ^ ; gaster smooth and shining. Pterostigma and nerves of 

 the wings dirty yellow. Long. 7-5-8 mm. (5-8 mm. teste Andre.) 



cJ Colour as in the $. 



Head striate. Thorax striate ; mesonotum transversely striate, with a 

 space between the Mayrian furrows, and a space on each side generally smooth 

 and shining. Petiole and post-petiole finely striate ; gaster smooth and 

 shining. Wings as in the $. Long. 5-5-6 mm. (6-7 mm. teste Forel.) 



Ovum : Yellowish white, round, oval. 



Larva : Yellowish white ; whiter and more hairy when young ; similar 

 to that of Aner gates, the head however is furnished with short hairs, the 

 short branching hairs scattered over the whole body are not so densely, 

 nor compactly branching, and the longer hairs are not serrate. Long anchor- 

 tipped hairs are situated on the dorsal surface of the second to the sixth 

 abdominal segments. 



Pupa : Pale yellow, smooth and shining, as if cut out of wax. 



Original description of Formica caespitum Linnaeus [Syst. Nat. 

 Ed. 10 1 581 (1758)] : 



" F. petiolo nodis duobus alternis : posteriore majore. 

 Habitat in Europae tuberibus." 



Habitat. 



Tetramorium caespitum is very common in Europe and Asia, 

 and is also found in Japan ; it is rare in North Africa, and is 

 present in North America as an introduced species. A number of 

 subspecies and varieties occur, chiefly in the Mediterranean 

 Regions. 



In Great Britain it is most common on the seashores in the 

 south of England, but has also been found in a number of inland 

 localities, and occurs as far north as the Bass Rock and Ailsa 

 Craig : 



Cornwall, W. : Scilly Isles (Farren- White)* 3 ; Tresco (F. Jenkin- 

 son); Tol-Pedn-Penwith 55 ; The Lizard (Dale Coll.) ; The Land's 

 End (F. Smith) 22 ; Cornwall, E. : Pentire Point (Rothney}* 6 ; New- 

 quay (Nevinson)* 8 ; St. Issey (Crawley and Donisthorpe) 66 ; Tre- 

 betherswick (Hallett) ; Whitsand Bay (Bignell) ; Boscastle and 

 Downderry 55 . 



Devon, S. : Stoke Fleming (Perkins) 38 ; Dawlish (Hamm) ; 

 Seaton (Crawley) ; Branscombe (Farren- White)* 1 ; Haldon, Black- 

 down, Exmouth Warren, and Plymouth (Parfitt) 33 ; Devon, N. : 

 Ilfracombe and Morthoe (Saunders Coll.) ; Lynmouth (Farren- 

 White)* 3 ; Lee Bay (Bagnall) ; Lundy Island (Donisthorpe) 67 . 



Somerset, N. : Batheastoii 56 . 



Dorset : Charmouth (Dale) 15 ; Lyme Regis (Nevinson) 51 ; 

 Wareham (Dale Coll.) ; Studland (Morice) ; Swanage (Nevinson). 



