1865.] 



153 



postscutelluni, and sides of metathorax, clothed, more or less, with pale. 

 glittering, somewhat silvery pubescence ; tubercles yellowish ; meta- 

 thorax rugose; tegulae dull honey-yellow. Wings hyaline, iridescent; 

 nervures blackish; second submarginal cell receiving the first recurrent 

 nervure near its base; third submarginal cell nearly twice the width of 

 the second, its outer nervure bent inwards above the middle, the second 

 recurrent nervure sinuate, received by the third submarginal cell at the 

 extreme base. Legs blackish, the four anterior tibiae and tarsi, and 

 the base of the posterior tibiae, whitish. Abdomen oblong-ovate, shining ; 

 first segment with a rather long, slender petiole ; apical margins of all 

 the segments, except the last, obscure testaceous; apical segment pube- 

 scent. Length 3 lines; expanse of wings 4i lines. 



Male. — Resembles the female, but is more slender, the antennae 

 longer, and except the tips, entirely blackish; the abdomen much more 

 elongate beyond the petiole, and the extreme apex acute and slightly 

 recurved. 



Collection. — Dr. J. Gundlach. Two specimens. 



Genus CERCERIS, Latr. 

 Cerceris flavocostalis. n. sp. 



Ferruginous; broad orbits, tip of antennse, collar, tegulse, most of pleura, scu- 

 tellum, spots on metathorax, most of legs, and the first and apical margins of 

 remaining abdominal segments, yellow ; wings fusco-hyaline, costa broadly 

 yellow; abdomen very minutely punctured. 



Female. — Dull ferruginous, opaque, slightly pubescent; head large, 

 broader than the thorax, yellow, stained on the vertex, occiput and 

 cheeks with ferruginous; the sides of the lace, when viewed from above, 

 have a bright silvery reflection ; vertex flattened, with a transverse, 

 slightly arcuated, blackish line, passing just behind the ocelli, and down 

 the middle of the face are two blackish lines on which the antenna' 

 are situated, divided by a yellowish line which is elevated and acutely 

 carinate between the antennae; clypeus strongly produced, slightly 

 convex, truncate at tip, dull ferruginous, with a yellow, subtriangular 

 spot on its disk ; mandibles long, acute, honey-yellow, black at tips ; 

 antennae dull fulvous, fuscous above near the middle, the four apical 

 joints orange-yellow. Thorax opaque, dull ferruginous; collar, most of 

 pleura, tegulae, scutellum, the triangular space on the dorsal base of the 

 metathorax, as well as its sides, and two small approximate spots on the 

 posterior face, all yellow; mesothorax with two very indistinct longitu- 

 dinal lines on the disk; pleura prominent; the central well impressed 

 line of the metathorax and its extreme tip, about the insertion of the 

 abdomen, black, Wings tusco-hyaline, the posterior margin and the 



