MYRMICA. 267 



Key to the Species. 



a. Thorax more or less longitudinally rugose. 



^ striate. 



a'. Medial portion of clypeus produced, an- 

 gular, the apex obtuse. 

 a 2 . Length 6 mm. ; metanotal spines long, 



as long as the basal face of nietanoturn. M. rugosa, p. 268. 

 o . -Length 3'o-4'o mm. ; metanotal spines 

 short, only about half as long as basal 



face of metanotuin M. smythiesi, p. 269. 



. Medial portion of clypeus not produced. 



not angular, transverse. 

 o 2 . Head regularly longitudinally striate, 



the striae not broken or reticulate M. rilct, p. 267. 



6 2 . Head irregularly longitudinally striate, 

 the striae coarser, broken and posteriorly 



reticulate M. margarita, p. 267. 



o. Thorax transversely rugose striate M. inezte, p. 2(38. 



305. Myrmica ritae, Emery, Ann. Mus. Civ. Gen. xxvii (1889), p. 501. 



, pi. 11, fig. 27. 



. Head and antennae reddish yellow, the head shaded with 

 fuscous on the front ; thorax and pedicel dark brown, almost 

 black, legs yellow, the abdomen dark brown above and below in 

 the middle, yellowish at base, along the sides and at apex ; pilosity 

 pale, very sparse, pubescence entirely wanting. Head shining, 

 longitudinally coarsely sulco-striate, mandibles shining, striate at 

 base ; clypeus narrow, the striae on the medial portion subobsolete; 

 frontal area depressed, smooth and shining; antennal carinae 

 somewhat wide apart, parallel, reaching very nearly level with 

 the top of the eyes ; antennae long, the scape extending beyond 

 the top of the head ; eyes promiuent, Literal, placed about the 

 middle of the head ; head more or less oval, but with a distinct 

 slightly emarginate posterior border, the cheeks very convex. 

 Thorax elongate, coarsely rugose, with broken longitudinal furrows; 

 the metanotal backward-pointing spines smooth, slender and 

 acute ; legs smooth, very long and slender. Pedicel : the nodes 

 large, coarsely sculptured, the posterior node posteriorly and above 

 somewhat smoother than the anterior node ; abdomen subglobose, 

 highly polished, smooth and shining. 



Length, $ 4'5-6 mm. 



Hab. Teuasserim, Muleyit, 3000-4500 ft. (Fea). 



306. Myrmica margaritae, Emery, Ann. Mus. Cn: Gen. xxvii (1889), 



p. 502, $. 



$ . Head, thorax and pedicel dark piceous brown, head anteriorly 

 reddish brown, the mandibles and antennae brownish yellow, legs 

 and abdomen clear, somewhat pellucid ochraceous yellow ; pilosity 

 short and sparse, pubescence absent. Head with the mandibles 



