1915] Johnson — Note on the Species of the Genus Acrocera 203 



and "alarum venis fere ohsoletis" would certainly apply to the 

 venation. Another feature common to both specimens is the 

 entirely light yellow tarsi, only the claws being black. All of the 

 other species have the terminal joint blackish. 



Acrocera fumipennis Westwood. 



This may prove to be only a dark form of the preceding species. 

 The entire absence of yellow markings in the description and the 

 statement that the base of the wings is smoky brown, cannot how- 

 ever applj^ to those I have seen with obsolete venation. 



A NEW BOG-INHABITING VARIETY OF FORMICA 

 FUSCA L. 



By William Morton Wheeler. 



Several entomologists have recently called attention to the ants 

 inhabiting peat-bogs in Northern Europe. Nylander, as long ago 

 as 1846, described a peculiar, shining black Formica as F. picea 

 from Sphagnum bogs in Finland^ and this species has since been 

 collected in Germany, Denmark, England, Russia and Siberia but 

 has been usually referred to F. gagates Latreille, a form described 

 from France. Emery ^ first definitely recognized the two forms as 

 distinct, though he regarded both as subspecies of fiisca. He 

 gave the distribution of gagates as Southern Europe and Asia 

 Minor and that of picea as Northern Europe and Asia as far as 

 China, whence it had been recorded by Forel under the name of 

 filchneri. Forel has since described a ^'ar. formosoe of picea from 

 the Island of Formosa.^ 



In 1913 Donisthorpe found picea in England nesting in Sphag- 

 num,'' in 1914 Adlerz found it in the same situations in Sweden,^ 

 and during the same year and 1915 Bonner published two inter- 



1 Adnotationes in Monographiam Formicarum Borealium Europae, Act. Soc. Sc. Fenincae, 2, 

 1846, pp. 875-994 and Additamentum Adnotationum in Monogr. Form. Bor. Eur. Ibid., pp, 

 10^8-1062. 



2 Beitrag3 zur Monograpliie dgr Formiciden des palaarktischen Faunengebietea, VII, Deutsch 

 Ent. Zeitschr. 1909, pp. 179-204, 16 6gs. 



3 H. Sauter's Formosa- Ausbeute: Formicidaj IT. Arch. f. Naturg. 79, 1913, pp. 183-202. 

 * Myrmecophilous Notes for 1912. Ent Record 25, 1913, pp. 61-68, 89-97. 



6 Formica fusca picea Nyl. en Torfmos.aarnas Myra. Ark. f. Zool. 8, 1914 p. 1. 



