98 U. S. NATIONAL MUSEUM BULLETIN 216 



Hind femur black, broadly white or yellow basally on the outer side, or some- 

 times the white or yellow covers entire femur except for an apical black 

 mark which is most extensive on inner side; facial shield about 1.05 as high 

 as wide; space between facial shield and clypeal margin about 0.13 as great 



as height of shield 3 



3. Second recurrent vein with one bulla; tergites 4 to 6 apically white or yellow, 

 rarely mostly yellow (figs. 186,a,b) 1. pollinctorius Say 



Second recurrent vein with two bullae; tergites 4 to 6 yellow with a discal pair 

 of black spots (fig. 186,c) 2. bellus Cresson 



1. Metopius (Tylopius) pollinctorius Say, new combination 



Front wing 7 to 13 mm. long; facial shield broadly rounded below, 

 without a trace of a basal point, the shield about 1.05 as high as wide 

 and separated from margin of clypeus by about 0.13 its height; 

 second recurrent vein with one bulla; abdomen moderately broad, its 

 fourth tergite about 0.77 as long as wide; second tergite densely punc- 

 tate, the interspaces reduced to lines; sixth tergite of female about 

 1.0 as long as wide, with rather coarse evenly spaced punctures; 

 seventh tergite of male with coarse, evenly spaced punctures. 



This species is very close to the Palaearctic Metopius pinatorius 

 Brulle (see fig. 169, a), which may prove to be a subspecies of it. 

 It is represented in North America by two subspecies as described 

 below: 



1. Hind tibia entirely or largely black; body markings whitish; range: East of 

 100th meridian and westward to the Pacific in Canada and the northern 



United States la. pollinctorius pollinctorius Say 



Hind tibia entirely yellow; body markings yellow; range: Washington, Nevada, 

 and California lb. pollinctorius nevadensis Cresson 



la. Metopius (Tylopius) pollinctorius pollinctorius Say, new combination 



Figure 186,a 



Peltastes pollinctorius Say, 1836, Boston Journ. Nat. Hist., vol. 1, p. 245 (Leconte 

 ed., vol. 2, p. 700); d\ ?. Types: Indiana and Pennsylvania (destroyed). 



Metopius cordiger Brulle\ 1846, in Le Peletier de Saint-Fargeau, Histoire naturelle 

 des insects. Hymenopteres, vol. 4, p. 120; o". Type: cf, Carolina (Paris). 



Biology: Schaffner and Griswold, 1934, Misc. Publ. U. S. Dep. Agr., No. 1881, 

 p. 144. 



Male: Black, the abdomen usually with a dark metallic blue tint. 

 Face, interantennal process, side of frons, often most of clypeus, 

 often most of cheek, mouthparts except apex and margins of mandible 

 and usually the labial palpus, under side of scape and pedicel, large 

 lenticular mark along upper edge of pronotum, usually a large ver- 

 tically elliptical mark on upper part of mesopleurum next the prepectal 

 carina, sometimes a narrow stripe on subtegular ridge, apex of scutel- 

 lum and usually its basolateral appendage, transverse band on post- 

 scutellum, spot at apex of area dentipara, most of trochanters and 

 bases of femora (including the basal 0.5 db of hind femur in front), 



