1898.] NATURAL SCIENCES OF PHILADELPHIA. 73 



Elaphroptera plagiata Sui. {==Thynnus plagiatus Sm.) 



One specimen. Both this and decora were collected at Chapada 

 (October). 



Elaphroptera cribraria n. sp. 



9. — Black; legs reddish testaceous, a curved yellow line over 

 the base of each antenna ; head large, twice as wide as broadest 

 part of mesothorax, covered with deep, regularly separated punc- 

 tures (the punctuation is almost sieve-like), covered with a rather 

 long, pale, erect pubescence ; cheeks behind eyes almost impunctate ; 

 scape shining, strongly punctured, bearing some stiff, golden hairs 

 beneath, as do also the mandibles; mandibles falcate, when closed 

 apparently not dentate ; mesothorax above with large, sparse punc- 

 tures, emarginate and depressed anteriorly in the middle, pleurae 

 polished ; scutellum punctured ; middle segment finely punctured, 

 subconvex, not excavated or depressed ; hind femora beneath, be- 

 fore apex, with a long tooth or spine ; tibia? and tarsi very strongly 

 spinose ; tarsal claws cleft; abdomen large, with strong, sparse 

 punctures and long, pale pubescence beneath ; second dorsal seg- 

 ment bearing four sharp, transverse carinas, the first dorsal trans- 

 versely sulcate at apex ; sixth segment in the form of a narrow, lon- 

 gitudinal carina. Length 13 mm. 



Rio de Janeiro (November). One specimen. 



Elaphroptera brunnea n. sp. 



9 . — Brown, the head in front, thorax and legs in part, and two first 

 abdominal segments, palest, the remainder castaneous or blackish- 

 brown ; mandibles basally, a spot before and behind the eyes, sides of 

 clypeus, fore femora internally, spot at apex of medial femora, stripe 

 on fore tibia? externally, and on medial tibia? internally, yellow. 

 Head medium, wider than thorax, finely though distinctly punctured, 

 with sparse long hairs; occiput high and sharply margined, sparsely 

 punctured ; scape strongly punctured with some golden bristles be- 

 neath ; mandibles slender, falcate, without teeth ; mesothorax above 

 with two concavities, the portion dividing them formed into a tooth- 

 like process posteriorly ; middle segment rather squarely cut off be- 

 hind, the upper surface in the middle posteriorly with a tubercle or 

 prominence; thorax is not distinctly punctured; tibia? and tarsi 

 strongly spinose; hind femora scarcely dentate at apex beneath; 

 first dorsal segment of abdomen sharply truncate anteriorly, the 

 truncation bounded posteriorly by a carina, behind which in the 



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