40 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



Ferruginous red, with legs paler. 



Female. — (dealated). Length 1.90 mm. 



Petiolar node concave at middle of front, with the anterior corners 

 more prominent than in the worker, otherwise similar, excepting the 

 usual sexual differences. 



Type locality. — Honduras: Ceiba. Cecilia. 



Type.—C2.t. No. 24459, U.S.N.M. 



Described from" a single female and a small series of workers from 

 two colonies taken b}^ breaking apart red-rotten wood. 



This species is related to the South American R. cUhita Mayr and 

 R. holaui Mayr, the latter known only from a female, both of wliich 

 are much larger in size. 



RHOPALOTHRIX (RHOPALOTHRIX) GRAVIS, new species. 



Worker.— Length 2.30-2.50 mm. (fig. 19). 



Head, excluding mandibles, slightly longer tlian broad, broadly 

 and rather stroi'.gly concave behind, posierior })ortioii of sides obliqne- 



FlG. 19. RHOPALOTHRIX (RHOPALOailRIX) GRAVIS, NEW SPECIES. WORKER. 



n. Head; 6, thorax and petiole. (Only the larger hairs are 



SHOWN.) 



ly truncate. Clypeus about twice as broad as long, nearly straight 

 at anterior margin. Mandibles rather stout, outer border very 

 feebly concave at middle, blades with ten teeth. Antennae 7-jointed, 

 their scapes at base a little more than one-fourth as broad as long, 

 the outer angle narrowly rounded; first funicular joint longer than 

 broad, second joint as long as broad, joints ?>^ slightly longer than 

 broad, terminal joint as long as remainder of funiculus less the first 

 joint. Eyes small, strongly convex. Thorax with a very indistinct 

 impression, which does not interrupt the sculpture, in the region of 

 the promesonotal suture and constricted at sides. Sides of pronotum 

 subgibbous. Mesonotum convex in outline. Mesoepinotal suture 

 strongly impressed. Base and declivity of epinotum subequal in 

 length, the surface of the former nearly flat in front and concave 

 between the spines which are half as long as the declivity, broadly 

 triangular in shape, much compressed, directed backward and 

 slightly upward, at base extending as narrow margins to sides of 



