166 BRITISH ANTS. 



Leptothorax interruptus Schen. 



Myrmica interrupta Schenck Jahrb. Ver. Naturk Nassau 8 106-107 1 140 2 

 145 3 (1852). Leptothorax interruptus Mayr Verh. Zool. Bot. Ver. Wien 5 

 446 (1855) 4 . Myrmica (Leptothorax) simpliciuscula Nylander Ann. Sc. Nat. 

 Zool. (4) 5 92 (1856) 5 . Leptothorax tuberum r. interruptus Forel Denkschr. 

 Schweiz. Ges. Naturw. 26 85 6 228 7 415 8 (1874). Leptothorax tuberum var 

 interruptus Er. Andre Spec. Hym. Europe 2 299 (1881) 9 . Leptothorax inter- 

 ruptus Dalla Torre Cat. Hym. 7 124 (1893) 10 ; Bondroit Ann. Soc. Ent. 

 Belg. 55 12-13 (191 1) 11 . Leptothorax tubero-affinis (teste Forel) Donisthorpe 

 Ent. Rec. 24 306 (1912) 12 . Leptothorax tuberum var. tubero-affinis Donis- 

 thorpe Ent. Rec. 25 63 (1913) 13 . Leptothorax affino-tuberum Crawley and 

 Donisthorpe Int. Ent. Cong. Oxford 1912 2 20-21 (1913) 14 . Leptothorax 

 tuberum subsp. interruptus Crawley Ent. Rec. 26 94, 96, 108 (1914) 15 . 



$ Reddish yellow, with the front of the head, and the club of the antennae 

 blackish ; gaster with a more or less distinct brown patch at the base of the first 

 segment, often interrupted in the middle, and extending up the sides of the seg- 

 ment, legs, mandibles, and the rest of the antennae yellow, or reddish yellow. 



Head rugose, finely striate ; clypeus as in tuberum ; antennae twelve- 

 jointed. Thorax slightly more finely rugose than the head, no impression 

 between mesonotum and epinotum ; epinotal spines long, narrow, curved, 

 about two-thirds as long as the basal face of the epinotum. Pedicel a little 

 more finely rugose than the thorax ; gaster smooth and shining. Legs without 

 erect hairs. Long. 2-3-3-4 mm. 



Fig. 79. Scutellum and epinotum 

 of Leptothorax interruptus $. 



$ Club of antennae, head, thorax, and pedicel black, mandibles, legs, and 

 the rest of the antennae yellow ; gaster blackish brown with a narrow yellow 

 band at the apex of all the segments. 



Head longitudinally striate, rugose ; clypeus as in tuberum ; antennae 

 twelve-jointed. Thorax : mesonotum finely longitudinally striate ; scutellum 

 smooth and shining in the centre ; epinotal spines longer than in tuberum. 

 Pedicel rugose ; gaster smooth and shining. Wings clear ; radial cell small 

 and closed. Long. 3-7-4-5 mm. 



Fig. 80. Pedicel of Leptothorax interruptus <$. 



<$ Black, mandibles, antennae and legs pale dirty brownish yellow, with 

 the articulations of the legs and tarsi lighter. 



Head finely rugose ; mandibles quadridentate ; antennae thirteen- jointed, 

 scape as in tuberum, funiculus with joints two to five as broad as long. Thorax 

 finely striate longitudinally ; mesonotum at the sides and scutellum in the 

 centre more finely striate than the rest of the thorax, which gives the appear- 

 ance of being smooth and shining ; epinotum armed with two blunt tooth- 



