16 E. T. CRES80N. 



tured, and on each side of disk at base a crest of about six erect obtuse, com- 

 pressed teeth. 



Head, pro- and mesothorax black, with erect black hair; mandibles, base of 

 antennse, and legs fuscous; metathorax and pleura covered with a fine dense 

 pale golden sericeous pile, and clothed above with long pale erect hair; calcaria 

 white ; abdomen at base and sides with long pale erect hair, the second segment, 

 when viewed from above, honey-yellow, with a black X-shaped mark covering 

 the crests and confluent posteriorly on apical margin : third and following seg- 

 ments densely pale golden sericeous, and clothed with erect, pale hair; venter 

 fuscous, with pale glittering pubescence. 



Rio de Janeiro. One specimen taken in October. Easily recog 

 nized by the crested second segment of the abdomen having a black 

 X-shaped mark. 



4. M. iraciiiifla 9- — Length 8 mm. — Head and thorax above densely, 

 coarsely and coufluently punctured; head transverse, scarcely broader than 

 thorax, eyes rounded, very prominent, almost globose, smooth and polished ; 

 thorax fiddle-shaped ; mesothorax with three teeth on each side, one at anterior 

 angle and two near posterior margin ; metathorax with four or five acute teeth 

 on lateral margin, the second one large and directed posteriorly ; the spine at tip 

 of posterior tibiaj long, porrect, thick at base and abruptly slender at apex ; abdo- 

 men ovate, about as long as head and thorax together, basal segment broad, de- 

 pressed, apical margin subconstricted, baud-like, with a transverse, subapical row 

 of tubercles or teeth ; second segment depressed, and on each side the sur- 

 face is obliquely elevated, crest-like, covered with subdepressed tubercles, al! 

 pointing backward ; on each side behind the crest the surface is broadly depressed 

 and densely punctured. 



Black, with erect black hair, pale on face and silvery on cheeks ; sides of thorax 

 silvery sericeous; the stigmatic tubercles at base of metathorax ferruginous; basal 

 segment of abdomen with silvery hair, a few long black hairs near apical mid- 

 dle, the depressed apical margin silvery; the depressed surface of second segment 

 above ferruginous, opaque, arranged in three large spots, that on basal middle 

 being smallest and subcordate, the other two very large and separated on disk by 

 a narrow black line; third and following segments silvery sericeous; beneath, 

 the second segment is shining, with rather large sparse punctures; calcaria pale. 



Santarem. One specimen. A very distinct species, easily recog- 

 nized by the color and sculpture of the second abdominal segment, 

 which is tuberculate and having three large, opaque, depressed, fer- 

 ruginous spots. 



5. iVI. Nediicta J.— Length 10 mm. — Eobust ; head transverse, as broad as 

 the thorax, densely and confluently punctured ; eyes large, ovate, depressed, dis- 

 tinctly netted; thorax quadrate, rather longer than broad, sides parallel, not 

 narrowed medially, but somewhat sinuate, unarmed, above longitudinally ru- 

 gose; posterior face of metathorax broadly but not deeply concave, shining, lat- 

 eral margin serrate ; flanks of thorax more or less excavated, smooth, shining and 

 pale sericeous ; abdomen broadly ovate, first segment very broad, flattened, sessile 



