G. C. DAVIS. 199 



Basal segment oval and black, except apical corners; scutellum 

 broadly yellow at apex ; hind tibiae piceous. 



xanthostigina Asbm. 

 Basal segment pyramidal, mostly yellow: apex of scutellum nar- 

 rowly yellow. 

 Postertor tibise and tarsi black, or witb faint yellow line beneath. 



polliiict4»i'iiis Say. 



Posterior tibiie and tarsi yellow nevailensis Cress. 



Segment two with yellow band at apex. 



Wings fuliginous; basal segment pyiamidal robiistus Cress. 



Wings yellowish hyaline ; basal segment oval. 



Abdomen at base and most of legs rufous COiiiptlis Cress. 



Abdomen at base and legs black and yellow scitiiliis Cress. 



Abdomen with apical segments entirely, or almost entirely yellow. 



Segment two black with lateral yellow margins, segments 4-6 with black 



dorsal spots bell lis Cress. 



Segment two black, with apical margin red or yellow; segments 4-6 



rarely with black spots nioiifaiius Cress. 



Thorax and bead rufous, with yellow, or yellow and black markings. 



pulcliellus Cress. 

 IVIetopius ultimatum n. sp. 



% . — 15 nnn. Black, with yellow markings as follows : facial shield, mandi- 

 bles, second segment of maxillary palpi, scape beneath, orbits opposite, line in 

 front of tegulje, scutellum at sides, postscutellum, large and small spot above hind 

 coxae, apex of four anterior coxae, trochanters and femora, four anterior tibiae and 

 tarsi, posterior coxae above, trochanters, femora at apex and tibiae at base, apical 

 half of abdominal segment one and apex of segments 3-5; posterior tarsi, palpi 

 and antennae dusky; wings reddish fuscous throughout; facial shield with a 

 distinct median vertical carina. 



One specimen from Illinois (type coll. Amer. Ent. Soc). 



MetopiiiN rufipes Cress., Proc. Ent. Soc. iv, 270. 



9 . — 15 mm. Black, with legs, two basal segments of abdomen, antennae, palpi 

 and mandibles, rufous; margin of facial shield, line before and large dot beneath 

 tegulae, large spot above posterior coxfe and smaller one within, scutellum and 

 broad apical margin on all the abdominal segments, yellow ; wings yellowish 

 fuscous, hyaline at apex, costal margin fulvous. 



One specimen from Colorado (type Amer. Ent. Soc). 



IVIetopiiis basalis Cress.. Proc. Ent. Sec. A. N. S., 1879, xxvii. 



J. — 23 mm. Black, with margin of facial shield, front of posterior femora, 

 except at apex, stripe on four anterior tibiae, apical half of abdominal segment 

 one and large apical spots in corners of segment two. yellow : antennae tapering 

 toward apex ; facial shield concave ; wings uniform fuliginous; abdomen slender, 

 with distinct median carina; segment one with only a shallow channel between 

 the two elevations ; abdominal segments biemarginate. 



Type from Florida (coll. Amer. Ent. Soc). 



9Iet(>piiis errantia n. sp. 



9. — 10 mm. Black, with the following yellow markings: border of facial 

 shield, anterior orbits, scape beneath, small spot in front and another l)eneath 



TRANS. AM. ENT. SOC. XXIV. JULY. 1897. 



