46 E. T. CRESSON. 



stripe on each side at apex of first abdominal segment, a spot on apical middle of 

 segments 2-5, forming a stripe, a double line on extreme sides of segment 2, a 

 spot on sides at apex of segments 2 and 3, and fringe on apical segment, all of 

 silvery pubescence; a small, more or less oblique, subpyriform, smooth, polished, 

 yellow, rarely reddish, spot on each side of second segment towards apex, and 

 two narrow longitudinal spots of same color at base, placed opposite to the silvery 

 stripes on first segment ; venter shining, with apical margin of segments 2 and 3, 

 sometimes 4, fringed with whitish pubescence; apical segment with black pu- 

 bescence. 



Chapada. Common. Recognized by the fulvous stripes on thorax, 

 and by the two posterior pale shining spots on second abdominal 

 segment being more or less oblique and subpyriform. 



68. M. crixa 9-— Length 9-13 mm.— DifTers from cA-n^at/a as follows: ver- 

 tex with a transverse line or spot of silvery pubescence between the eyes; stripes 

 on thorax above narrower, silvery pubescent, and extending only a short distance 

 forward on the mesothorax ; pubescence on legs mostly pale ; the smooth shining 

 red or yellow spots on second abdominal segment larger and broader, the two 

 posterior ones subquadrate or rounded, not oblique; the extreme lateral margin 

 of segment 4 has a silvery pubescent spot as well as 2 and 3. 



Chapada. Common. 



69. M. compar Andre (Bull. Soc. Ent. de France, 1895, p. cccxxi).— ?.— 

 Length 10-13 mm. — Much like crixa, but differs as follows: the vertex has a sil- 

 very subarcuate band from eye to eye; the slender silvery stripes on thorax gen- 

 erally extend forward nearly or quite to prothorax ; the two smooth orange-red 

 spots on base of second segment of abdomen are round, not elongate, and those 

 on posterior part transversely quadrate or rounded and placed closer together; 

 segments 4 and 5 only have a silvery pubescent spot on apical middle. 



Corumba. 



70. IW. vagabunda Smith (Descr. New Spec. Hym Brit. Mus., 1879, p. 214). 

 9.— Length 11-14 mm. — Rather slender; head transverse, not broader than 



thorax ; eyes round, prominently convex ; thorax elongate, considerably narrowed 

 behind the middle, slightly notched in front of the metathoracic spiracles; nieta- 

 thorax rounded above, not abruptly declivous behind, subcompres.=ed and flat- 

 tened laterally, the lateral edges subserrate ; first abdominal segment small, 

 transversely subnodose and subconstricted at apex ; the four small, smooth, 

 raised spots on second segment above polished and with a few scattered punc- 

 tures, the apical spots trausvei'se, those at base narrow, longitudinal ; apical seg- 

 ment longitudinally striated ; first ventral segment with a prominent, compressed, 

 truncated, dentiform carina on middle, second segment with large deep .scattered 

 punctures. 



Velvety black, the pubescence very short, appressed and black ; a spot on ver- 

 tex, two narrow stripes on metathorax extending slightly on base of mesothorax, 

 a stripe on lower margin of flanks, a spot on apical corners of first abdominal 

 segment, extreme lateral margin of second, spot on lateral apical corners of seg- 

 ments 2-4, and spot on apical middle of 2-5, forming a central longitudinal 



