ABT. 13. ANTS FROM HONDURAS AND GUATEMALA MANN. 39 



Tijfe locality. — Honduras: Ceiba. 



Cotypes.—Q^^i. No. 24458, U.S.N.M. 



Described from one female and live workers. 



This species is related to 8. crasslcomis Mayr from Southern 

 Brazil, which differs in its longer epinotal spines, longitudinally 

 ridged pronotum, more angulately expanded antenna! scapes and in 

 lacking (at least in the specimen before Mayr) the spongiform brush 

 on the postpetiole. 



STRUMIGENYS ALBERTI Forel. 



Honduras: San Juan Pueblo, Cecilia. 



The first gastric segment of the workers in my series is more 

 strongly infuscated than in workers from Hayti and Cuba and one 

 from Costa Rica (collection Forel) but the specimens seem otherwise 

 the same. 



RHOPALOTHRJX (RHOPALOTHRIX) AMOENA. new species. 



Worker. — Length 1.75 mm. 



Head, excluding the mandibles, a little longer than broad, shallowly 

 and broadly concave behind, posterior portions of sides convex in- 

 stead of straightly truncate as usual in the other species, anterior por- 

 tion of sides nearly straight and subparallel. Clypeus flat, distinctly 

 broader than long, anterior border nearly straight. Mandibles slen- 

 der, the outer border feebly concave at middle, tips slender, blades 

 with eight triangular teeth. Antennae 7- jointed, scapes at base about 

 one-fourth as broad as long, the basal corner rounded, first funicular 

 joint slightly broader than long and much broader than the second, 

 joints 2-5 transverse, the third and fourth more strongly than the 

 second and fifth; terminal joint nearly as long as the remainder of 

 funicular. Eyes convex. Pro-mesothorax a little longer than broad, 

 widest and rather narrowly rounded at middle, surface feebly con- 

 vex. jSIesoepinotal suture distinct. Base of epinotum as long as the 

 declivity, slightly convex in front, flat behind. Epinotal spines 

 strongly compressed, triangular, very feebly curved at tips, their 

 bases extending as lamellate margins to the declivity. Petiolar pe- 

 duncle about as long as wide, which is flat above, barely broader than 

 long, with sides and corners rounded and anterior border straight. 

 Postpetiole twice as broad as long and more than twice as broad as 

 petiole, its surface narrowly excised in back of middle. 



Nearly opaque. Head and body coarsely cribately punctate, the 

 head somewhat rugulose, especially in front. Mandibles and legs 

 densely punctate and not more shining than the rest. 



Head and body (except epinotum) and appendages with elongate, 

 flattened-subappressed, whitish hairs. Head, thorax, and gaster beset 

 with regular, very coarse, club-shaped hairs. 

 20107— 22— Proc. N. M. vol. 61 16 



