BRAZILIAN MUTILLA. 63 



Chapada (April). Two specimens. This species and gracilis are 

 easily separated, from the following species of this group, by the 

 carinate tegulse. 



7. jfl. argeutula Dalla Torra (Catal. Hym., viii, p. 11; argentata \\ K\ug, 

 Nova Acta Cses. Nat. Cur., x, p. 305, pi. xxi, fig. 11).— 'J,. — Length 10.5 mm. — 

 Black, opaque. Head silvery tomentose, vertex black, with black pubescence; 

 clypeus with two minute teeth toward base; eyes emarginate. Pro- and meso- 

 thorax as in gracilis, the former silvery tomentose ; scutellum coarsely punctured, 

 convex, protuberant, the pubescence black, pale at apes ; nietathorax and pleura 

 densely silvery-white tomentose, the former flattened, depressed on each side of 

 the subcarinate disk, lateral margin straight, subcarinate and terminating poste- 

 riorly in a prominent subacute tooth pointed backward, the punctuation fine, as 

 seen through the silvery tomentose ; tegulie shining fuscous, not carinate. the pu- 

 bescence black. Wings much as in gracilis. Legs slender, with pale glittering 

 pubescence; calcaria white. First abdominal segment narrow, depressed, quad- 

 rate, densely silvery tomentose; second segment broadly flattened at base above, 

 densely, distinctly punctured, the pubescence short and black, a broad baud at 

 base and a narrow one at apex, attenuated on disk, silvery tomentose, apex of the 

 segment smooth and shining; remaining segments longitudinally carinate on 

 middle and sparsely clothed with j)aie glittering pubescence; beneath, the second 

 segment is more or less silvery tomentose, the apical segment with a large quad- 

 rate testaceous spot. 



Sautareni. The second segment of the abdomen is more flattened 

 above at base than in gracilis, and has a broad white tomentose 

 baud, wanting in that species. 



8. M. iiiorada '^.—Length 9 mm.— Very much like argentnla, anil differs 

 mostly as follows; — the scutellum is produced and bilobed at apex; the meta- 

 thorax less flattened, and roughly sculptured as seen through the silvery tomen- 

 tose, the disk not carinate or toothed at apex, the lateral posterior angles have a 

 short subacute tooth directed outwardly; the second abdominal segment is only 

 slightly depressed at base and without the broad silvery tomentose band. 



Santarem. One specimen. 



9. M. eroata %. — Length 6-8 mm. — Differs from iworarfa only as follows: 

 scutellum convex, not bilobed at apex ; nietathorax with the lateral margin ser- 

 rate and an apical porrect discal tooth ; base of second abdominal segment sub- 

 convex, or very feebly depressed. 



Chapada ; Corumba ; Santai'em. 



10. M. jatoba %. — Length 11 mm.— Very much like morada, And differs by 

 the scutellum being prominent and convex, not bilobed at apex ; the lateral pos- 

 terior angles of metathorax more obtuse; the second abdominal segment less 

 deeply punctured, and the last ventral segment entirely black. 



Santarem. One specimen. Larger than croata, with more con- 

 vex scutellum, and more angulate sides of metathorax. 



TEANS. AM. ENT. SOC, XXVIII. JANUARY, 1902. 



