508 PROCEEDINGS OF THE ACADEMY OP [1893. 



7 — Front, though distinctly punctured, yet not coarsely so; space 

 between eyes at top about equal to the length of antennal joints 



2-4 united 8 



Front coarsely punctured; space between eyes at top greater than 



the length of antennal joints 2-4 united 9 



8 — Thorax with silvery pubescence; front with an indistinct, medial 



impressed line acutus. 



Thorax without silvery pubescence; front with a distinct, medial, 



impressed line nigrior. 



9 — Abdomen ventrally rather strongly punctured; metapleura 1 



coarsely striated apiealis. 



Abdomen ventrally very finely punctured; metapleura? finely 



striated fusus and terminatus. 



10 — Occiput remarkably depressed in the middle, so that the portion 



behind each eye is much swollen inusitatus. 



Occiput normal 11 



11 — Metapleura? coarsely striated. 



Antenna? elongate, the third joint fully twice longer than broad; 

 space between the eyes at top less than the length of joints 3 



and 4 united amplus. 



Antenna? short, stout, the third joint about as broad as long; 

 space between eyes at top about equal to the length of antennal 



joints 3-5 united texanus. 



Metapleura' not coarsely striated 12 



12 — Space between eyes at top about equal to joints 3 and 4 united . 13 



Space between eyes at topless than the length of joints 3 and 4 . 17 



13 — Flagellum rather short, stout, thickened medially . . . spisHcitus. 



Flagellum long, slender, not thickened medially 14 



14 — Metathorax above reticulated consimilis. 



Metathorax above not reticulated, at the most finely granulated. 



15 



15 — Abdomen entirely red tarsatus. 



Abdomen black apically 16 



16 — Size small, slender; front finely granulated. Length 6 mm. . . . 



parvulus. 



Size medium, robust; front more punctured than granulated. 



Length 10 mm com pacta*. 



17 — Upper surface of metathorax as long as the dorsulum; form slen- 

 der dubius. 



Upper surface of metathorax shorter than the dorsulum; form 



stout 18 



18 — Front coarsely and distinctly punctured montanus. 



Front granulated, or else it is so very closely punctured that it 



appears so 19 



19 — Upper surface of metathorax coarsely and irregularly wrinkled. 



quebecensis. 



Upper surface of metathorax not wrinkled 20 



