1893.] ■ NATURAL SCIENCES OF PHILADELPHIA. 4<S9 



7 — Deep-black, not sericeous; metathorax above rather finely trans- 

 versely striated; winy- dark fuscous tenuicornis. 



Clothed with sericeous pile; metathorax above very coarsely, trans- 

 versely plicated or rugose; wings subfuscous discreta. 



8 — Wings subhyaline; form rather slender conferta. 



Wings dark fuscous; form stout 9 



9 — Antcnn;e long, setaceous, in length greater than head and thorax 



united divisa. 



Antennte short, stout, in length by no means as great as head and 

 thorax consimilis. 



MALES. 



1 — Space between eyes at top not greater than the length of auten- 



nal joints 2 and 3 united 2 



Space between eyes at top decidedly greater than the length of 

 antenna! joints 2 and 3 united, as great or greater than the 



length of joints 3 and 4 3 



2 — First joint of flagellum but little shorter than the second; front 



coarsely sculptured aurulenta. 



First joint of flagellum nearly one-tbird shorter than the second; 

 front finely sculptured (abdomen varying from entirely black 



to red and black) distincta. 



3 — Wings clear; space between eyes at top about equal to the length 



ofantemial joints 3 and 4 united conferta. 



Wings dark fuscous 4 



4 — Space between eyes at top as great, or greater than, the length of 



antennal joints 2-4 united 5 



Space between eyes at top less than the length of antennal joints 

 2-4 united (deep-black, shining) tenuicornis. 



5 — Clypeus closely punctured throughout; dorsulum opaque, com- 

 pactly punctured 6 



Clypeus rather sparsely punctured; dorsulum shining with the 

 punctures tolerably fine and separated vegt ta. 



6 — Antenna} shorter than head and thorax united; basal abdominal 



segments red 7 



Antennae about as long as head and thorax united; at the most 

 the second abdominal segment only red (or the abdomen en- 

 tirely black); abdomen finely, though distinctly punctured 

 basally; sculpture of vertex coarser than that of front . rugosa. 



7 — Basal abdominal segments distinctly punctured; last dorsal seg- 

 ment not keeled laterally; metathorax above transversely rugose 



divisa. 



Basal abdominal segments not punctured; last dorsal segment 

 distinctly keeled laterally; metathorax above indistinctly stri- 

 ated consimilis. 



32 



