78 K. T. CRESSON. 



39. ]fl. sabara J, .— Length 10-12 mm.— Black ; head and thorax closely and 

 rather (ioarsely punctured, metathorax reticulated ; the head above, pro- and 

 mesothorax, and abdomen above behind base of second segment, clothed with 

 short black pubescence, longer on sides and apex ; face, clypeus, cheeks and 

 thorax beneath with pale glittering pubescence. Eyes rounded, convex, promi- 

 nent. Scutellum depressed, the pubescence long and erect, lateral teeth promi- 

 nent, suberect, polished; pleura without tubercle beneath tegulte; metathorax 

 with a patch of dense whitish tomentose on disk, sometimes separated into two 

 spots. Wings pale fuscous, extreme base and a streak beneath stigma pale; mar- 

 ginal cell scarcely as long as second and third submarginal cells combined, rounded 

 at tip ; second submarginal a little longer than high, narrowed one half above, 

 receiving the recurrent nervure before the middle; third submarginal subtri- 

 angular, not extending beyond tip of marginal. Legs with pale glittering pubes- 

 cence, more dense on tibise and tarsi ; calcaria white. Abdomen shining behind 

 first segment, which is nodose at apex and subconstricted, thinly clothed with 

 long white hair, the apical half densely silvery sericeous tomentose; second and 

 following segments feebly punctured, the pubescence black, base of second seg- 

 ment with a narrow band of dense silvery sericeous pile, broadened laterally ; 

 sides of segments 3 and 4 with a patch of long white pubescence; venter shining, 

 clothed with pale glittering pubescence, more dense on apical margin of segments 

 2-4; apex black; second segment feebly and sparsely punctured, without discal 

 fovea. 



Chapada ; Santarem. 



40. M. taboca % . — Length 10-12 mm. — Closely allied to snhara and may be 

 only a variety, but differs by the pubescence of the legs, except tarsi, being black, 

 and the third abdominal segment above has a silvery sericeous pubescent band, 

 generally more or less broadly interrupted medially. 



Chapada. 



41. 91. inara(>a %. — Length 12-14 mm.— Slender, black, shining. Head 

 rather finely and closely punctured, clothed with glittering griseons pubescence, 

 more dense and silvery on clypeus and cheeks; eyes large, ovate, prominently 

 convex. Thorax coarsely punctured, metathorax reticulated ; mesothorax with 

 short black pubescence, on prothorax, pleura and metathorax it is silvery seri- 

 ceous, dense on metathorax above, which latter is also clothed with long pale 

 silky hair; a prominent subacute spine beneath tegulie; scutellum reticulated, 

 convex, lateral teeth long, prominent, the somewhat hooked tips directed in- 

 ward; metathorax broadly rounded posteriorly and prominent laterally. Wings 

 hyaline, apex broadly and tip of basal cell subfuscous; marginal cell broadly 

 rounded at apex, as long as second and third submarginal cells combined ; sec- 

 ond submarginal elongate, narrowed one-fourth on marginal, receiving the recur- 

 rent nervure between middle and base; third submarginal small, triangular, 

 reaching almost to apex of mai-ginal. Legs rather slender, the pubescence silvery 

 sericeous, most dense on tibise and tarsi ; calcaria white. Abdomen slender, the 

 first segment elongate, narrow, nodose at apex, clothed with dense, appressed, 

 silvery sericeous pubescence, interspersed with long white silky hair; second 

 segment feebly punctured, polished, basal half and sides covered with dense ap- 

 pressed silvery sericeous pul)escence, as are also segments 3 and 4, and base of 5, 



