506 PROCEEDINGS OF THE ACADEMY OF [1893. 



the base; tarsi strongly spiuose, especially the first joint of the 



posteriors , spinosus. 



Hind legs black 4 



4 — Anterior margin of the clypeus strongly crenated . . . crenulatus. 

 Anterior margin of clypeus not crenated, at the most with two 



teeth laterally 5 



5 — Greater part of abdomen reddish 6 



Abdomen black, or equally red and black 9 



6 — Pygidium scarcely twice as long as it is broad at the base .... 



triquetrus. 



Pygidium decidedly more than twice longer than it is broad at 



base 7 



7 — Antenna? long, not setaceous scarcely acuminate apically . . . 



antennatus. 



Antenme as usual, acuminate apically 8 



8 — Anterior margin of clypeus not or but very slightly emargiuate. 

 Dorsulum very closely punctured; metathorax above finely coria- 

 ceous; front finely granulated tarsatus. 



Dorsulum shining, with the punctures separated; metathorax 

 above finely granulated; front rather coarsely granulated . . . 



semirufus. 



Anterior margin of clypeus distinctly emargiuate; front exceed- 

 ingly finely granulated exsectus. 



9 — Longer spur of hind tibi&e shorter than the first joint of hind 



tarsi; abdomen about equally red and black 10 



Longer spur of hind tibiye decidedly longer than the first joint of 

 hind tarsi; abdomen with segments broadly testaceous, with at 



least four silvery bands mundus. 



10— Metathorax above granulated; distance between the third trans- 

 verso-cubital nervure and the apex of marginal cell is usually 

 greater than the width of the third submarginal cell at the top. 



tenuipunctus. 



Metathorax above more or less longitudinally striated or wrinkled; 

 distance between the third transverso-cubital nervure and the 

 apex of the marginal cell less than the width of the third 



submarginal cell at the top decorus. 



11 — Space between eyes at top equal to or greater than the length of 



an tennal joints 3 and 4 united 12 



Space between the eyes at top less than the length of an tennal 



joints 3 and 4 united 15 



12 — Anterior margin of clypeus produced medially into a short lobe. 13 

 Anterior margin of clypeus not at all produced iuto a lobe ... 14 

 13 — Wings hyaline, iridescent; metathorax granulated above . fusus. 

 Wings, except base, fuscous; metathorax above coarsely reticu- 

 lated fumipennis. 



14 — Metathorax, above, granulated; usually the last two abdominal 

 segments red terminatm. 



