larger ant. t'aiiiponotns uhscisits. More recently Emery ( i893~'94) has 

 described a .Mih>pecic- of stolli as florid a tins, from specimens taken by 

 IVrgande in Florida from a hollow twig of Sideroxylon, and I have 

 described ( \()(>~,l> i a variety, litcayanus, taken in a Tillandsia in the 

 l>ahama>. As both of these forms were living in independent formi- 

 caries, it is not improbable that the typical stolli was merely living in 

 plcsio- or parabiosis with the Camponotus. 



4. Plmcotd sichcli and noualhieri. The former species was de- 

 scribed by Roger (1862/7) from a single worker taken in Andalusia, 

 the latter by Finery .( 18957 ' from a single worker taken in a nest of the 

 Algerian Monomorium subnitiditin. Nothing is known of the habits 

 of these two species of Phacota, so that their position here is purely 

 conjectural. 



5. Mynno.vcnns gordiagini is a small ant recently discovered 1>\ 

 Ruzsky (1902, 1905) living in the Kirghis steppes in nests of Lepto- 

 thora.v scri'iculits. This is probably a case of xenobiosis, but nothing 

 definite seems to be known concerning the relations of the two species. 



6. Sifolinia launr. This ant, recently described by Emery (1907) 

 'from a female specimen taken in Italy, is structurally related to Fonni- 

 co.rcnus, Myrmoxenus and Harpagoxenus, and is, therefore, in all 

 probability, a parasitic or xenobiotic insect. Its host is unknown. 



7. Mynnica niynno.rcna. Many years ago ( 1874) Forel described 

 a singular diminutive male and female as aberrant forms of Mynnica 

 Icrinodis, since they were taken in a nest of this species by Bugnion at 

 an altitude of about 2.000 in. in Switzerland. Although no one has 

 since found these small forms, Forel now regards them as types of a 

 distinct species (M. iiiynno.rcna), probably living in xenobiosis with 

 the closely allied levinodis. 



8. Symmyrmica chainbcrlini (Fig. 260). This interesting little ant 

 is allied to Formicoxenus in all three phases, especially in the male, which 

 is ergatoicl (Wheeler, 19046). This sex, however, is much less worker- 

 like in the structure of the head and thorax than the male of the Euro- 

 pean inquiline. The workers often have stemmata. The only speci- 

 mens I have seen were sent me by Mr. F. V. Chamberlin, who found 

 them in Utah living in nests of Mynnica inutica. The following note, 

 which accompanied the specimens, leaves little doubt that the relations 

 of the Symmyrmica to its host are similar to those of Formicoxenus 

 to Formica rnfa: ' Nests of Mynnica inntica are common in some 

 localities near Salt Lake City over the flood-plains of the Jordan River. 

 The soil where they occur oftenest is prevailingly argillaceous and 

 sometimes contains much ' alkali.' I have not found them in stony or 

 gravelly ground. All the nests observed opened free from any cover, 



