1912] The Pezomachini of North America 137 
Pezomachus americanus Ashm. 
Theroscopus americanus Ashm. 
This Virginian species described as Theroscopus americanus 
by Ashmead (Trans. Amer. Ent. Soc. Vol. 23, p. 211) also belongs 
to the genus Pezomachus. 
Pezomachus kukakensis Ashm. 
Theroscopus kukakensis Ashm. 
This species, described by Ashmead with the preceding, 
from Kakak Bay must also be transferred to Pezomachus. 
Micromeson nov. Sub-genus of Pezomachus. 
Head large, wider than the thorax, but not very transverse. Antennz 
of 2 not very slender, longer and more slender in the &. Thorax sub- 
cylindrical. Prothorax greatly enlarged and swollen, larger than the 
much reduced mesothorax, the mesonotum of which only covers the 
median area of the basal half of the anterior thoracic node. Scutellum 
defined as a small indistinct tubercle in the 9, but more definite in 
the co. 
“Metathorax”’ strongly gibbous with no carina. Females apterous. 
Male apterous in only known species. 
Petiole very long and unusually slender, somewhat longer than the 
“metathorax,”’ with or without prominent spiracles. Ovipositor 
shorter than the petiole. 
There are three species belonging to this group: 
Pezomachus texanus (Cress.) Can. Ent. Vol. 4, p. 64. 
Se annulatus (sp. nov.) 
lymensis (sp. nov.) 
“ec 
They fall into a class so distinct from the other named Pezo- 
machi that they certainly deserve a separate subgeneric if not 
a new generic name. 
The most conspicuous characters are: 
1. The much reduced mesonotum, and correspondingly swollen prothorax. 
2. The elongated, slender petiole, associated with the uncarinated ‘‘metathorax’”’ 
Micromeson annulatum sp. nov. 
Female 6-6.5 mm. A large conspicuous species with head and 
thorax entirely clear ferruginous. The abdomen is of a somewhat 
darker ferruginous color and has a very conspicuous black basal band 
on the third segment, and a less distinct one on the second segment. 
Remaining segments with very narrow inconspicuous apical bands. 
Head from above shagreened, dull, not quite twice as wide and thick 
along the median line. Anterior, ot facial, border rather concave and 
sunken between the eyes. The margined occiput is but slightly excavated. 
Antennz 23-25 jointed, concolorous with the head, though rather more 
