724 Bulletin American Museum of Natural History. [Vol. XXIII, 



The male has the posterior border of the head broadly excised and the 

 posterior corners with acute, slightly recurved teeth. Except in pilosity 

 transversus is closely related to denfafus, as Forel has observed. 



20. Cyphomyrmex rimosus salvini Forel. 



Cyphomynnex rimosus race salvini Forel, Biol. Centr.-Am., Hymen., Ill, 1899- 

 1900, p. 40, pi. iii, fig. 2. 9 . 



Forel described only the female of this form from a specimen taken at 

 Bugaba, Panama. The late Dr. F. C. Paulmier brought me from Port 

 Limon, Costa Rica two males and several workers which seem to me to 

 belong; to this same form. The worker is larger than that of anv of the other 

 subspecies of rimosus, measuring nearly 2.5 mm. The frontal lobes are 

 very large and concave, the ear-like corners of the head much prolonged and 

 pointed. The thoracic projections, especially the anterior pronotal pair, 

 are long and acute, the epinotal teeth very faintly indicated. The petiole 

 is more than twice as broad as long, the postpetiole about 1^ times as broad 

 as long, with excised posterior margin and a posteromedian impression. 

 There is also a distinct median impression at the base of the gaster. The 

 hairs are much flattened and scale-like, pearly white and abundant, appressed 

 on the body, but reclinate or even suberect on the legs and scapes. The 

 body is light chocolate brown, the legs and antennae paler. 



The female according to Forel's description, measures 3.7 mm. and is 

 very similar to the worker in the shape of the head. The superior pronotal 

 teeth are stout and triangular, the epinotal teeth much reduced. The 

 postpetiole is proportionally broader than in the worker, the gaster very 

 convex, feebly marginate on the sides and without any indications of de- 

 pressions and elevations. 



The male, too, is decidedly larger than the corresponding sex in other 

 forms of rimosus, measuring nearly 3 mm. in length. The superior occipital 

 teeth are short and acute, the superior pronotal pair blunt and rather slender. 

 In the place of the spines, the epinotum has a pair of broad, laterally com- 

 pressed projections, which are continued forward and backward on the 

 base and declivity as prominent ridges. The hairs on the body and append- 

 ages are all appressed and not very abundant, not dilated on the legs and 

 only slightly scale-like on the body. The latter is chocolate brown like 

 that of the worker, with the first gastric segment blackish, the mandibles, 

 clypeus, frontal lobes, antennae, legs, terminal gastric segments and genitalia 

 dull vellow. The wings are verv dark brown or blackish. 



