202 FORMICII>;E. 



230. Monomorium dichroum, Forel, Rev. Suissc Zool. x (1902), p. 212. 



$ . Remarkably like M. pharaonis, Linn., in colour, but is a 

 shorter, more robustly built insect. Reddish yellow, the abdomen 

 black, with the base above a clearer brighter reddish yellow than 

 1 he colour of the thorax ; head, thorax, pedicel and base of abdo- 

 men more or less densely minutely rugulose and opaque, the 

 sculpture on the base of the abdomen lighter ; pilosity nearly 

 .vanting, as in M. pharaonis ; pubescence very thin and light. 

 Head not so long as in the above species, but broader, the occiput 

 slightly einarginate ; mandibles and clypeus similar ; antennae 

 shorter, the scape falling distinctly short of the top of the head ; 

 eyes placed a little more anteriorly than in M. pharaonis. Thorax 

 somewhat depressed, broad ; the meso-metanotal suture only mode- 

 rately impressed; the metanotum rather short and abruptly trun- 

 cate. Pedicel : 1st node squamiform, with a long petiole anteriorly ; 

 2nd node globose, broader than long ; abdomen oval. 



$ . Apparently both winged and ergatoid. The former " of a 

 reddish yellow with some brown marks ; abdomen smooth." The 

 latter " entirely brown with 3 ocelli " ; the abdomen reticulate, 

 the metanotum gr6oved but without teeth ; the rest resembling the 

 $ of M. schurri. 



Length, $ 2-2-5 ; $ 3-4 mm. 



Hab. Southern India, the Nilgiri hills (Daly). 



231. Monomorium pharaonis, Linn. rFormica), Syst. Nat. ed. 10, i 



(1758;, p. 580. 

 Myrmica domestica, Shuck. CharleswortK s Mag. N. H. new ser. ii 



(1838), p. 626. 

 Atta minuta, Jerdon, Madr. Jour. L. S. xvii (1851), p. 105. 



$ . Reddish yellow, the posterior two-thirds of the abdomen 

 black ; head, thorax and nodes of the pedicel densely, minutely, 

 rugulose and granulate, shining in certain lights, abdomen smooth 

 and shining ; pilosity almost entirely wanting, reduced to a few 

 scattered hairs on the apex of the 'abdomen, pubescence minute 

 and silky. Head half as long again as broad, the sides slightly 

 convex, the posterior margin transverse ; mandibles narrow, linear, 

 slightly broadened at the masticatory margin : clypeus narrow, 

 convex, its anterior margin rounded ; antennae somewhat long and 

 thick, the scape reaching very nearly up to the posterior margin 

 of the head ; eyes placed somewhat below the middle of the sides 

 of the head. Thorax : pro-mesonotum convex, rounded in front 

 and at the sides, narrowing posteriorly ; meso-metanotal suture 

 very distinct, thorax slightly ernarginate at the suture; metanotum 

 seen from above rectangular, somewhat flat, the posterior lateral 

 angles of the basal portion slightly prominent, scarcely tuberculate, 

 the apical portion oblique, about the length of the basal portion. 

 Pedicel: the 1st node cuneiform, but a little thick and rounded at 

 the top, not sharp, anteriorly with a moderately long petiole ; 2nd 

 node trom above globose, slightly broader than long and broader 

 than the 1st node; abdomen oval, truncate anteriorlv. 



