1912] The Pezomachint of North America Thy 
Thorax short and broad. Mesonotum piceous, similarly shagreened 
to the head, somewhat gibbous and with an obsolete median furrow. 
No indication of a scutellum. ‘“‘Metathorax”’ black, strongly declivous 
posteriorly. Transverse carina incomplete medially but with the 
apophyses produced into extremely prominent projections, which gives 
the posterior face of the “‘metathorax’’ a concave appearance. There 
are two longitudinal carinze on either side. Surface rather coarsely 
shagreened and clothed with long white outstanding hairs. 
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Fig. 1. Thaumatotypus spinulatus. 
Petiole very long and not much expanded, as long as the thorax, 
‘strongly aciculate and with but shghtly projecting spiracles. Remainder 
of abdomen elliptical, with the apex sharply pointed. Surface black, 
smooth and shining, with a sparse long pubescence. Second segment 
greatly enlarged, covering 34 of the length of the abdomen, the third 
segment covers most of the remainder. The apex of the fourth is all 
that is exposed of the remaining segments. There is an indefinite 
testaceous band near the apex of each segment. Viewed from the side 
the dorsal sclerites are seen to be much produced below the body of the 
