MYRMICID.E. 31 



sexes ; abdomen'in thecJ, with seven visible segments, of tho 

 ? and 5 witli six, the second joint of the petiole with a 

 strong spine beneath. This curious little genus, of which 

 the apterous $ was discovered by M. Adlerz, is peculiar in 

 the great similarity which exists between the $ and 5. 

 which are hardly distinguishable except by the different 

 number of autennal joints, and of the abdominal segments. 

 M. Adlerz points out that specimens occur somewhat inter- 

 mediate between the i and $ , the ocelli being less 

 developed than in the normal $ , as well as the genital 

 organs. There is only one known species, which associates 

 with Formica rufa : it is found always in or near its nests, 

 but beyond this there is little recorded of its habits. 



F. nitidulus, Kyi. ( ? and 9 , Stenamma WcstwooiU 

 Sin: Snund. Syno2Jifis). — (J apterous, very shining, testa- 

 ceous, abdomen, except the petiole and the extreme base 

 of the third segment, pitchy brown ; antennte darkened 

 near the apex. Mandibles narrow, their external margin 

 obliquely truncate at the apex, internal margin not toothed, 

 genital armature nearly hidden, legs pale, testaceous. 



? rather larger and darker than the (J ; mandibles 

 widened towards the apex, their apical margin denticulate, 

 thorax widened in the centre, wings with one submarginal 

 and one discoidal cell ; abdomen beyond the petiole, pitchy 

 brown, basal joint of the petiole looked at sideways very 

 angular above ; legs pale, testaceous. 



5 like the <J except as noted in the generic description. 



L- <S< 9, 3-4 mm., ? 5 mm. 



Nests of F. rufa, Weybridge ; Guildford; [Smitli). 

 Shiere; {Dr. Capron). Scarborough; (Laiu.ion). Esher; 

 {Champioti). 



MYRMECINA, Curt. 



(J and ? winged 9 aptert)us ; J antenna3 thirteen- 

 jointed, ? and ? twelve-jointed, with a three-jointed club; 

 maxillary palpi four-jointed, labial palpi three-jointed. 



