FORMICID.E. !■ 



(6) 1. Five gp^meiits of tlie alnloraen visible above 

 in 5 3nd ?. Apical segment conical, and 

 its opening ciliated, apical and circular. 

 Poison bag with a cushion above, sting 

 entirely transformed into a support for 

 the nioTith of the bag. ^ with the cal- 

 caria of the middle and hind legs simple. 



(5) 2. Scale of the petiole erect. 



{\) 3. (J, first joint of flagellum, not thicker than 

 the rest. $ and $ with the .second to 

 fifth joints of the flagellnm longer than 

 those at the apex, and the frontal area 

 very distinct Foemica. 



(3) 4. (J, first joint of flagellum much thicker than 

 the rest. ? and 5 with the second to 

 the fifth joints of the flagellum as short as 

 or shorter than the apical ones, and the 

 frontal area indistinct .... Lasius. 



(2) 5. Scale of the petiole not erect .... Pbenolepis. 



(1) 6. Four segments of the abdomen only visible 

 from above in the $ and ? , the fifth being 

 hidden under the fourth, orifice wide and 

 transverse, inferior, not ciliatfd, poison 

 bag without a cnshion, sting rudimentary. 

 cJ with all the calcaria serrate . . . Tapisoma. 



FORMICA, Linu. 



$ and ? about equal iu sizCj •workers variable, the 5 

 major often half as large again as the 5 niinor. $ and J 

 without stings ; maxillary palpi six-jointed ; antennae thir- 

 teen-jointed in the ^, twelve in ? and ?, mandibles 

 comparatively feeble in the $ , wide and triangular in the 

 9 and ? , much narrowed at the base ; thorax subovate 

 in the ^ and ? , constricted in the middle iu the 5 , upper 

 wings with two submarginal, and one discoidal cell ; petiole 

 with an erect flattened scale ; pupae generally enclosed 

 in silken cocoons. Forel says that the workers do not 

 follow in line over unknown ground, but that they frequently 

 carry one another, the one carried being rolled up under 

 the head of the carrier. We have four of the six European 

 species in this country. 



(2) 1. Vertex of the head emarginate, petiole scale 



deeiily notched ...... rx.sECTA. 



