NORTH AMERICAN HYMENOPTERA. 309 



Heiul from alwve fully twice as broad as it is loug in tlie middle, not nnuh 

 narrowed behind ; petiole about equal to the first joint of the bind tarsi 



in length aiigularis. 



Clypens with two eniarginations medially; enclosed space on metanotuni 

 longitudinally striated ; petiole distinctly longer than the first joint of 



the bind tarsi nearoticus. 



Joints 3-8 of the flagellum more or less angular or denticulate beneath. 



Enclosed space on nietanotum longitudinally striated throughout; apical 

 margins of ventral abdominal segments 2-5 whitish ; lu-tiole nearly as 



long as the first two joints of the hind tarsi united Uileyi. 



Enclosed space on nietanotum strongly excavated or depressed on basal half, 

 this portion with longitudinal ridgesorstriations, the apical half smooth ; 

 ventral aljdominal segments entirely black ; petiole a little longer than 



the first joint of hind tarsi conffertim. 



The recurrent nervures both received by the first submarginal cell. 



Head from above fully twice as broad as it is long in the middle, therefore 

 it is very transveree; pale hair on head and thorax very conspicuous. 



inoriiatus. 



Head from above not by any means twice as broad as it is long in the 



middle, therefore it is almost quadrate ; pale hair on head and thorax 



inconspicuous leiiax. 



1. Pempliredoii coiieolor Say. 



9.— Anterior margin of the clypeus in the middle subtruncate; front and 

 vertex with coarse dense punctures, which become sparse and less strong on the 

 occiput and cheeks, in addition the front has a few wrinkles laterally; ocellar 

 region slightly raised, alongside each of the hind ocelli there is an oblique, dis- 

 tinct impression and another longitudinal one on the vertex behind them ; head 

 from above almost quadrate, not very much narrowed behind ; clypeus with 

 large, sparse punctures: third joint of the antennre fully one-third longer than 

 the fourth ; dorsulum with coarse, close wrinkles, which originate in the medial 

 furrow, extending transversely a short way and then turn backwards; scutellum 

 and postscutellum with longitudinal wrinkles ; enclosure on metathorax above 

 depressed, channeled medially and with coarse irregular rugfe ; the tibite with a 

 few spines: petiole of abdomen nearly as long as the first two joints of the hind 

 tarsi uuited, roughened above, furrowed on the sides. Abdomen shining, with 

 very sparse and fine punctures, the apical segment above with a rather deep 

 channel, which is broadest basally; black, covered sparsely with pale hairs, 

 which are most obvious on the clypeus, cheeks, metathorax and petiole ; basal 

 half of wings hyaline, the remainder fuscous! nervures and stigma dark testa- 

 ceous. Length 13 mm. 



% .—Anterior margin of clypeus broadly and roundly emarginate ; front with 

 coarse, dense punctures, those on the vertex and cheeks sparse; no impressions 

 in the vicinity of the ocelli. Head from above scarcely twice as broad as it is 

 long in the middle, much narrowed behind ; autennte. long, almost reaching the 

 tegulfe. thiid joint but little (about one-fifth) longer than the fourth, joints 6-9 

 rounded out beneath, especially the seventh and eighth; dorsulum with large, 

 separated punctures, which are closest anteriorly; scutellum also coarsely punc- 

 tured ; enclosure on upper surface of metathorax not so much depressed as in 

 the female, with irregular, coarse rugjc, indi.stinctly channeled medially, at the 



TRANS. AM. ENT. SOC. XIX. DECEMBER, 1892. 



