472 PROCEEDINGS OF THE ACADEMY OF [1893. 



Our species were monographed a year or two ago; 2 conse- 

 quently I have thought it unnecessary to again give the descriptions 

 of the species in full. The following table, which is to be substituted 

 for that in the above mentioned monograph, will assist in identifying 

 the species. 



FEMALES. 



1 — Metanotum not trisulcate 2 



Metanotum trisulcate 15 



2 — Abdomen black, not banded with reddish 3 



Abdomen banded with reddish 9 



3 — Metanotum punctured or with very fine striatums 4 



Metanotum more or less striated or rugose 5 



4 — Wings blue-black, thorax with black pile abbitarse. 



Wings with the anterior pair fuscous, posteriors except apex hya- 

 line; thorax with pale pubescence albipilosum. 



Wings hyaline, their apical margins and the marginal cell fus- 



cous;thorax and abdomen with a silvery pile excavatum. 



5 — Metanotum with an enclosed space 6 



Metanotum without an enclosed space 7 



6 — Anterior portion of clypeus not strongly carinated, wings except 



apical margin hyaline; posterior tarsi whitish medially 



clavatum. 



Anterior portion of clypeus strongly carinated, wings subfuscous; 



I »osterior tarsi black .projectu >n . 



7 — Metathorax sulcate its entire length, more deeply so posteriorly, 



the furrow somewhat interrupted at apex of metanotum 8 



Metathorax sulcate on its posterior face only, the upper surface 



rugose; clypeus unidentate .frigidum. 



8 — Clypeus with a broad, quadrate tooth medially ...apicalis. 



Clypeus bidentate bide n tat um. 



9 — Metan otum punctured rubrocinctum. 



Metanotum more or less striated 10 



10 — Front with a strong projection; anterior half of clypeus strongly 



carinated tridentatum. 



Front with a longitudinal carina above the antennae 11 



11— Antennae entirely black 12 



Antennae, except apical portion reddish-fulvous 14 



12— Posterior tarsi whitish medially; second segment only red 



rufozon alis. 



Posterior tarsi not whitish medially; more than one segment red 



13 



13 — Third antennal joint rather strongly curved, in length about 

 equal to the space between the eyes at the clypeus, fourth and 

 fifth joints equal in length arizont use. 



2 Trans. Amer. Ent. Soc. XVIII, p. 136-148. 



