of the clypeus rounded; malar space two-thirds the length of the eyes. 

 Wings ample; nervures as in Entedon. 



Allied to Pleurotropis. Except on the mesonotum, which is striated, 

 the whole body is smooth and shining. There is a curved fovea in front 

 of the ocelli, and on either side, close to the eyes, is another fovea from 

 which issues a long hair. 



14;<S Rekabia testaceipes sp. nov. 



Black, shining, the antennae, tegulae, and legs rufo-testaceous, the 

 second abdominal segment pale testaceous; the clypeus and mandibles 

 testaceous, more rufous in tint; wings hyaline, the nervures testaceous. 

 Male. Length 2 mm. San Marcos, Nicaragua. 



Smooth and shining, except the mesonotum, which is transversely 

 striated on either side of the central furrow. Scutellum closely, minutely, 

 but distinctly punctured. Eyes brown. Abdominal petiole finely, closely 

 rugose. 



FOSSORES. 



3059 Rhopalum Nicaraguaense sp. nov. 



Black, scape of antennae, four anterior legs, hind trochanters, base 

 of tibiae, narrowly behind, more broadly in front and the apex of the 

 tibiae narrowly in front, the mandibles, except at the apex, tubercles 

 and tegulae, yellow; wings clear hyaline, the nervures black. Female. 

 Length 4.5 mm. San Marcos, Nicaragua. 



Opaque, smooth. Face, clypeus, and outer orbits below thickly co- 

 vered with silvery pubescence. Eyes very large. Flagellum testaceous 

 below. Pleurae and metanotum thickly covered with silvery pubescence. 

 Metanotal area clearly defined all over by furrows; the metanotum aci- 

 culated; the central furrow wide on the apex, the sides clearly margined 

 by a keel. Abdominal petiole as long as the following two segments 

 united; the apical segments testaceous laterally. 



This is the -smallest known species of Rhopalum or (Jrabro, from 

 Central America. The hind tibiae are greatly dilated and narrowed at 

 the base; they are flattened on the inner side and have there a distinct 

 margin behind; radical cellule wide; the apical abscissa of the radius 

 with a straight, oblique slope. 



3054 Cerceris Chinandegaensis sp. nov. 



Black, the clypeus, lower two-thirds of the inner orbits, antennal 

 keel, antennal scape below, two lines on the pronotum, apical half of 

 scutellum, post-scutelluni, outer part of tegulae, a broad band on the 

 apices of the first and second abdominal segments, a narrow line on the 

 sides of the third and a narrow complete one on the apices of the fourth, 

 fifth, and sixth, yellow; the apices of the four front femora, their tibiae 

 and tarsi, the basal half of the hind tibiae and the basal joint of the 

 hind tarsi, yellow. Scape of antennae yellow, of flagellum brownish. 



