310 WILLIAM J. FOX. 



base there is a transverse i-ow of large fossse; tibise not at all aprnose; petiole 

 of abdomen a little longer than the first joint of the hind tarsi. Abdomen 

 shining, with very sparse and fine punctures, the punctures stronger and closer 

 on the apical segment ; colored like the female; the pale hair is denser and more 

 obvious; face with silvery pile. Wings subhyaline throughout, iridescent, ner- 

 vures testaceous, costal vein and stigma black. Length 8 mm. 



North we&t territory (Say); Colorado; New Hampshire; Masaa- 

 chusetts. 



2. Pe nip lire do II »iig^ularis n. sp. 



9 • — Anterior margin of the clypeus in the middle produced into a strong an- 

 gle ; front longitudinally wrinkled and punctured r top of bead and cheeks with 

 large, sparse punctures; ocelli situated in slight pits, especially the anterior one; 

 vertex without a longitudinal impression. Head from alx)ve scarcely as long as 

 in concolor, narrowed more behind ; clypeus with large, sparse punctures; third 

 joint of antennae fully one-third longer than the fourth ; dorsulum as in concolor, 

 but the wrinkles are not so coarse, and are more distinct; scutellnm with large, 

 coarse punctures; enclosure on metathorax above not or very slightly depressed, 

 distinctly channeled medially, with coarse, irregular wrinkles, which are strongest 

 aud most widely separated basally ; tibiae not so distinctly spinose as in concolor ; 

 petiole of aMomen but little, if anything longer than the first joint of the hind 

 tarsi. Abdomen shining, very sparsely and finely punctured, the apical segment 

 above flat, not furrowed ; black, very sparsely clothed with pale hairs, which are 

 most obvious on the cl.ypeus, cheeks, metathoi-ax and petiole; wings subhyaline, 

 nervures and stigma testaceous. Length 12 mm. 



% . — Anterior margin of clypeus with a wide, rounded emarginatiou ; front 

 with coarse, dense punctures and a few indistinct wrinkles laterally; vertex and 

 cheeks with large, separated punctures, which are equally close on the cheeks 

 as on the vertex ; bead from above fully twice as broad as it is long in the mid- 

 dle, not near so much narrowed behind as concolor; antennse almost reaching 

 the tegulne, joints 6-9 rounded out beneath, especially the seventh and eighth; 

 dorsulum with large, separated punctures, which are most dense anteriorly; 

 scutellura also coarsely punctured, furrowed down the middle; enclosure on 

 upper face of metathorax indistinctly channeled, the rugse strongest on basal 

 portion; tibiae not at all spinose; petiole of abdomen about equal to the first 

 joint of the hind tarsi in length. Abdomen shining, with very sparse and fine 

 punctures; colored like the female; the pale hair denser; face silvery. Wings 

 slightly fuscous on apical portion, nei-vures and stigma testaceous. Length 10 mm. 



New Hampshire. Greatly resembles concolor, but is narrower. 



3. Penipliretloii Rileyi n. sp. 



9- — Anterior margin of the clypeus strongly emarginate in the middle: front 

 with strong, dense punctures, which become sparse on the sides and towards the 

 vertex; top of head and cheeks with large, sparse punctures, those on the cheeks 

 closest; ocelli slightl.v pitted. Head from above nearly quadrate, very slightly 

 narrowed posteriorly; third joint of antennae fully one-third longer than the 

 fourth; dorsulum with large, shallow punctures atid in addition with distinct, 

 irregular wrinkles; scutellura also with wrinkles and puuctures ; enclosed space 

 on metanotuni longitudinally striated, indistinctly channeled medially, the pos- 

 terior face of metathorax punctato-rvxgose. Legs rather robust, the tibiae moire 



