42 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol.61. 



Petiole densely and postpetiole more shallowly punctate. Legs 

 finely and densely punctate. Gaster smooth. 



Hairs fine, long and black on head and body, shorter and semire- 

 cumbent on legs. 



Black, legs fulvous, wings strongly infuscated. 



Type locality. — Honduras : Lombardia ; San Juan Pueblo. 



Cohjpes.—Q-3it. No. 24460, U.S.N.M. 



RHOPALOTHRIX (OCTOSTRUMA) BARBERI, new species. 



Worker. — Length. 1.75 mm. 



Head, excluding mandibles, barely broader than long, half as 

 broad at clypeus as at occiput, posterior portion of sides not dis- 

 tinctly truncated, occipital corners rounded, occipital border shal- 

 lowly concave at middle. Mandibular blades with four elongate, 

 triangular teeth, tips acute. Clypeus as broad as long, truncate in 

 front, posterior border narrowly rounded. Antennal scapes extend- 

 ing less than two-thirds the distance to occipital corners, their width 

 at base equal to three-eighths their length, expanded and narrowly 

 rounded at base; first funicular joint one and one-third times as 

 long as broad; joints 2-5 strongly transverse, joint six less trans- 

 verse; terminal joint nearly as long as the remainder of funiculus. 

 Eyes small and feebly convex. Pro-mesonotum rather flat in pro- 

 file; from above, evenly rounded at sides. Mesoepinotal impression 

 very distinct. Base of epinotum flat, sides straight, spines much 

 shorter than their distance apart at base, compressed, triangular. 

 Petiolar node shorter than the pedicel, from which it rises abruptly, 

 higher than long and higher in front than behind; from above, 

 broader than long, with straight anterior and posterior borders and 

 feebly convex sides. Postpetiole about one and one-half times as 

 broad as petiole. 



Opaque, densely cribrately punctate, more rugosely on head. 



Claviform hairs sparse on head, thorax, and petiole and tibiae, 

 more abundant on gaster, a row along border of antennal scapes. 

 Short, fine recumbent hairs rather sparse on head, body, and ap- 

 pendages. 



Dark reddish brown. 



Type locality. — Guatemala : Cacao. Trece Aguas, Alta V. Paz 

 (Barber and Schwarz). 



Cotypes.—Cdl. No. 24461 U.S.N.M. 



This species belongs in the group with halzani Emery and hatesi 

 Emery. It is distinct from the first of these in its more elongate 

 antennal scapes, from the second in its much smaller size and from 

 both in having the sides of head behind the eyes less truncated and 

 in the occipital border being narrowly, though very distinctly, con- 

 cave at middle. 



