22 MYRMICA SCABRINODIS. 



nodis petioli longitudinaliter striatis, profunde rugosis ; meta- 

 thorace spinis longiusculis. 

 Operaria. Similis foeminae. 



Mas. Nigro-fuscus, nitidus, sparse flavido-pilosulus ; mandibu- 

 lis, pedum articulis tarsisque et abdominis apice pallide rufes- 

 centibus; antennis obscure rufescentibus, scapo longitudine 

 quintae partis totius antennae. 



Myrmica scabrinodis, Nyl. Adno. Mon. Form. Bor. Eur. 930. 3 ; 

 Addit. Adno. Mon. Form. 1052. 20 ; Form. Fr. et d'Alger. 

 p. 81. 6. 



Foerst. Hym. Stud. Form. p. 67. 37. 

 Schenck, Beschr. Nass. Ameis. p. 98. 

 Smith, Brit. Form. 115.1. 

 Mayr. Form. Austr. p. 138. 6. 

 Myrmica caespitum, Zett. Ins. Lapp. p. 450. 1 <$ . 

 Myrmica rubra, Curtis, Trans. Linn. Soc. xxi. p. 213, 1. 



Female. Length 2| lines. Pale ferruginous, with a thin yel- 

 lowish pubescence ; the head above, the mesothorax with a 

 rounded spot anteriorly and a longitudinal stripe on each side, 

 fuscous, sometimes black ; the anterior spot on the mesothorax 

 in some cases obsolete ; the scape not attenuated at its base, 

 but abruptly elbowed, forming an acute angular lobe ; the head, 

 thorax, and nodes of the petiole rugose-striate ; the spines on 

 the metathorax long and acute ; wings hyaline, faintly smoky 

 at their base, the nervures and stigma pale testaceous. Abdo- 

 men ovate, very smooth and shining, with a fuscous cloud in 

 the middle, more or less dark in different individuals. 



Worker. Length H-2 lines. Very closely resembling the 

 female ; differing only in the usual sexual difference of the form 

 of the thorax, which is narrowed posteriorly and slightly stran- 

 gulated between the meso- and metathorax; the antennae 

 formed as in the female. 



Male. Length 2-2| lines. Very closely resembling the male 

 of the preceding species ; but may be easily distinguished by 

 the short scape of the antennae, which is not more than one- 

 fourth the length of the flagellum, and about half the length of 

 the scape of the male of ruginodis. 



The form of the antennae alone serves to distinguish this very 

 abundant insect from all its congeners. This ant is frequently 

 met with occupying one side of a little hillock thrown up by f. 

 flava. In some parts of the country it abounds to such an ex- 

 tent, that clouds, consisting of myriads of the winged males arid 



