MYRMICID.E. 39 



a transverse nerve whicli enters the cell and half divides 

 it ; all the tibite with pectinated calcaria. The short apical 

 joints of the flagellum, the last three of which taken to- 

 gether are not nearly so long as the remainder, and the 

 ti-ansvcrse nervure which half-divides the submarginal cell 

 in the wings of the S ^^^ ? > distinguish this genus at 

 once. We have but one of the two European species, 

 but of this there are five distinct races. Some of 

 these are known to harbour Aphides in their nests, and 

 also the curious beetles, Atemelos emargtnatus and para- 

 doxus ; these, however, also inhabit other ants' nests. The 

 S and ? swarm iu September ; the 5 carry each other as 

 described under Tctramorium. 



M, rubra, Linn. — cJ dark, or pale brown, shining, sur- 

 face with scattered semi-erect hairs, head across the eyes 

 wider than the thorax, mesothorax in front, propodeum and 

 abdomen polished and shiuiug, wings more or less dusky, 

 propodeum with two angular spines. 



? and ? testaceous, or pitchy, clothed with scattered 

 hairs, head and thorax more or less rugose or striated, 

 propodeum with two spines ; abdomen with the nodes of the 

 petiole varying from very rugose to nearly smooth, posterior 

 segments shining ; thorax in the ? constricted in the 

 middle. 



The different races can be best distinguished by the 

 following table, but occasionally intermediate forms occur 

 which are difficult to refer to their proper race. A curious 

 gynandromorphic specimen of race Iceuinodis is figured by 

 Smith, Ent. Annual, 1874, frontispiece, fig. 3. 



(6) 1. cj with tlie scape of the antenna) half as lon^ 

 as the flagellum, and also only gradually 

 curved near the base, ? and 9 with the scape 

 not angularly and sharply bent near the base. 



(3) 2. Frontal area longitudinally striated . . sulcinodis. 



(2) 3. Frontal area smooth and shining. 



(b) 4. (J tibice with long erect hairs ; J propodeal 

 spines not longer than their basal width ; 9 

 S|)ines scarcely longer than in the ? , the 

 space between them sjnooth and shining . l.evin'oiiis. 



