70 E. T. CRESSOX. 



rounded at apex ; second subniarginal little more tbau half the length of the 

 inaro;inal, pointed at base, receiving the recurrent nervure in the middle ; third 

 submarginal indistinctly defined, subtriangular, narrowed nearly to a point be- 

 neath. Abdomen shining, the pubescence pale ; first segment broadly dilated at 

 apex and sessile with base of second segment, conforming in outline therewith, 

 apical margin fringed with pale sericeous pubescence: second segment polished, 

 sparsely punctured, sericeous with pale pubescence; apical margin of segments 

 2-4 fringed with pale sericeous pubescence, that on apical segments black or fus- 

 cous; venter shining, the pubescence pale; second segment deeply and rather 

 closely punctured, the base not gibbous; apical mai'giu of segments 2-4 fringed 

 with pale pubescence. 



Chapada (February). Two specinieus. 



24. M. carino % . — Length 12 mm. — Robust, black; head and thorax closely 

 and finely punctured ; bead above, pro- and mesothorax and scutellum with short 

 black pubescence; clypeus, mandibles and cheeks silvery tonientose. Head 

 large, subquadrate, slightly broader than thorax, extended behind the eyes fully 

 their diameter, with rounded posterior angles; clypeus nasutiform, obtuse, deeply 

 notched in middle; mandibles broad, robust, produced and carinate at base be- 

 neath ; eyes rather small, round, convex, polished ; scutellum convex, punctured, 

 with a small smooth spot on disk; pleura silvery sericeous tomentose; anterior 

 angles of prothoi-as obtusely rounded ; metathorax short, broad and transverse 

 above, abruptly declivous behind, the upper surface densely silvery-white to- 

 mentose; tegulse small, round, polished, nigro-fuscous. Wings fuscous, marginal 

 cell broad, sublanceolate, the apex broadly truncate; fii-st and second submar- 

 ginal cells about equal in length, the latter pointed at base; third subniarginal 

 incomplete. Legs with pale pubescence ; calcaria white. Abdomen shining, 

 feebly punctured ; first segment very short and broad above, like a narrow band 

 or collar, densely silvery-white tomentose, sessile with base of second segment, but 

 not conforming in outline therewith, anterior face flat and abruptly declivous; 

 second segment polished and impunctured, very feebly punctured at apex ; sides 

 of segments 2-5 with pale sericeous pubescence, apical margin of segments 2-4 

 and apex with black pubescence; venter shining, the pubescence pale, silvery 

 tonientose on apex of second segment; apical margin of segments 2-4 fimbriate 

 with white pubescence; base of second segment gibbous and polished. 



Santarera. One specimen. Easily recognized by the robust, sub- 

 parallel form, the very short, broad, transverse basal segment of the 

 abdomen, which is nearly as broad as base of second segment, which 

 latter is smooth and polished above. 



The following nineteen species have the abdomen petiolate or sub- 

 petiolate, the first segment long, more or less nodose and constricted 

 at apex ; head not wider than the thorax ; eyes round or short ovate, 

 prominently convex ; scutellum generally convex, with a more or 

 less prominent tooth on each side at base, often hidden by the pu- 



