64 E. T. CRESSON. 



11. M. catinga %. — Length 12 mm. — Black, sparsely pubescent. Head and 

 thorax roughly sculptured with large discoidal punctures; clypeus smooth and 

 flat on apical middle, with two longitudinal carinas arising close together at ex- 

 treme base, slightly diverging to about the middle, and then obliquely directed 

 towards base of mandibles, and when viewed from beneath the clypeus appears 

 rather deeply emarginate and with two small teeth at the point of discal diver- 

 gence; eyes emarginate; front between antennte and clypeus thickly (clothed 

 with silvery-white pubescence. Lateral anterior angles of prothorax acutely 

 carinate, the posterior margin prominent; mesothorax longitudinally carinate; 

 scuteUum flattened, strongly produced, shield-shaped, with carinate sides, the 

 apex deeply emarginate, the lateral angles being prolonged, incurved and sub- 

 acute, the disk carinate on apical middle; metathorax densely silvery tomen- 

 tose, the lateral margin serrate, the apical middle with a prominent, rather long, 

 subporrect, obtuse tooth or spine ; a strong, subcompressed, obtuse tooth on pleura 

 beneath tegulae, the latter minutely alutaceous, with a shining subcarinate tuber- 

 cle at base. Wings subhyaline, with a strong violaceous reflection, fuscous on 

 apical and costal margins, nearly clear at base and in the third snbmarginal and 

 second discoidal cells; neuration much as in the proceding species. Legs slender, 

 the pubescence sparse and pale; calcaria white. Abdomen slender, subpetiolate ; 

 first segment twice longer than wide, of equal width, blue at base and densely 

 silvery-white tomentose, with long, sparse white hair; second and following seg- 

 ments purple, polished, with scattered pale hair laterally, sparsely punctured, 

 the punctures few and scattered on basal middle of second segment; segments 

 3-7 with a longitudinal central carina; venter black with scattered pale pubes- 

 cence, second segment blue, deeply, sparsely ])unctured, the apical segment pale 

 testaceous. 



Santarem. Two specimens. A very distinct species, easily recog- 

 nized by the shield shaped scutellurn, strongly toothed at apex, and 

 by the purj)le abdomen. 



12. fl. abadia ^ . — Length 9-12 mm. — Form much as in caiinga, but more 

 thickly pubescent ; the head, prothorax and pleura much less coarsely punctured ; 

 clypeus without the triangular open space at apex, the two longitudinal cariuse 

 on basal middle longer and ending in two acute teeth near anterior margin ; 

 mesothorax irregularly costate ; scutellurn conical, prominent; the central apical 

 tooth on metathorax more obtuse and compressed ; pleura protuberant, with a 

 median obtuse tubercle; tegulse more or less pinched at base; wings paler, the 

 third submarginal cell larger and broader beneath, receiving the recurrent nerv- 

 ure at about the middle, while in catinga it is received between the middle and 

 tip; legs more thickly pubescent; abdomen black, the first segment slightly 

 wider at apex, the second segment shining, strongly punctured, flattened and 

 almost smooth on basal half above, the apical margin fimbriate with white pubes- 

 cence, and the sides of remaining segments more thickly pubescent; beneath en- 

 tirely black with pale pubescence ; no testaceous spot on apical segment; other- 

 wise as in catinga. 



Santarem. 



13. M. Oiica % . — Length 8 mm.— Black ; head and thorax deeply punc- 

 tured. Head with pale golden pubescence, whitish on clypeus, eyes emarginate. 



