1912} The Pezomachinit of North America 125 
Thorax robust, binodose, with the nodes 
subequal and similar. | Mesothorax fuscous 
somewhat gibbose, with no scutellum indicated. 
Its surface is coarsely punctulate. ‘Meta- 
thorax’”’ piceous, strongly gibbose, with the 
carina indistinct medially, but well defined 
laterally; it is sharply declivous behind the 
carina and this portion bears two longitudinal 
carina on each side. Surface dull and coarsely 
shagreened before the carina, but shining behind. 
The legs are stout and dusky. 
The petiole is dusky and very stout. It is 
flattened dorsally and is somewhat aciculate, 
laterally are two very prominent tubercles 
which bear the spiracles. The remainder of 
the abdomen is ovate, piceous black and shiny, 
with a sparse pubescence. Ovipositor ferru- 
ginous with piceous sheaths; about the same | 
length as the petiole. Fig. 3. P. spiraculus. 
Observations. Described from a single specimen taken at 
Round Knob, N. Carolina. 
This species is easily recognized by its abnormally large 
petiolar tubercles. Typein the National Museum. =: 
Pezomachus dispar sp. nov. 
Three specimens, 2 7 and 1 9 of undescribed species of 
Pezomachus were bred from a spider’s egg capsule taken at 
Twining, Maryland. The @ differed considerably in color from 
the & @ but this appeared to be an insufficient reason for dis- 
associating the sexes. It is proposed however to make the & 
the type of the species, placing the 9 provisionally with it till 
further evidence determines whether this is a valid correlation 
or not. 
Male. Length 5.5 mm., fully winged; slender, head, thorax and 
abdomen piceous except for a divided ferruginous spot on the anterior 
portion of the mesothorax and yellowish apical bands on the first three 
abdominal segments. Legs dusky yellow. 
Head from above transverse, piceous though more ferruginous round 
the eye margins; ocelli large, antennz long and slender, 27—29-jointed; 
yellowish at base, mainly dusky. Face below antennz ferruginous, 
malar lines distinct short, about + to 3 as long as the face is wide at the 
lower angles of the eyes. Mandibular teeth transparent, palpi dusky. : 
Mesothorax well developed, surface shagreened, rather coarsely on 
disc, more finely laterally; clothed with a short pubescence. Parapsidal 
furrows well defined anteriorly, the space between them is of a fer- 
