1907.] Wheeler, Fungus-growing Ants of North America. 723 



^Mexico: Cuernavaca (Wheeler), 



The worker of this marked subspecies is described by Forel as follows : 

 "Differs from the type in that the basal surface of the epinotum has two 

 distinct teeth. The pronotal protuberances are stronger, more dentiform. 

 The occipital ears arc a little more pronounced than in the type of the species, 

 and especially form a more complete and larger groove for the scape which 

 surpasses them little if at all. Entirely pale ferruginous yellow, with the 

 front and vertex indistinctly brown. The petiole is also broader. The 

 postpetiole has a strong median notch at the middle of its posterior border 

 and its sides are prolonged as dentiform cones which are curved backward. 

 The sculpture is that of rivwsus, but the gaster has a distinct but very fine 

 system of minute, blunt tubercles. The pubescence is extremely short 

 and very fine, not dilated nor brilliant, so that it is inconspicuous." 



Two deiilated females of dentatiis in my collection measure 2.4 mm. in 

 length, and have prominent but blunt and upturned prothoracic spines 

 and strong laterally compressed epinotal teeth; the epinotal declivity is 

 very concave, the posterolateral cones of the postpetiole are more prominent 

 and the median dorsal region of the same segment is more concave than in 

 the worker. The head and thorax are much rougher than in the females 

 of the t\^ical rimosus and the gaster is more strongly tubercular, with a 

 short but deep median depression at the base of the first segment. The 

 body is dark brown, the upper surface of the head and thorax blackish and 

 covered with a bluish bloom. 



19. C3rphomyrmex rimosus trans versus Emcrij. 



Cyphomyrmex rimosus subsp. transversus Emery, Bull. Soc. Eat. Ital., XXVI, 1894, 



p. 90, ^ o ^. 

 Cyphomyrmex dentatus race olindanus Forel, Ann. Soc. Ent. Belg., XLV, 1901, p. 



337, §. 

 Cyphomyrmex rimosus transversus Emery, Bull. Soc. Ent. Ital.. XXXVIII, 1905, p, 



161, ? c?- 



Brazil: Matto Grosso (Emery); Ceara and Olinda (P. J. Schmitt). 



The worker of this subspecies resembles deiiiatus iii sculpture and in the 

 development of the thoracic projections, but the appressed hairs on the 

 body are broader and more scale-like even than in the typical rimosus, 

 the petiole and postpetiole broader, and the median dorsal impression on 

 the latter and on the base of the first gastric segment deeper and longer. 

 The epinotum has blunt but distinct teeth. 



In the female the epinotal teeth are ver\' large, comjiressed and obtuse, 

 the pedicel even broader than in the worker. 



