SMULYAN: NEW ENGLAND TENTHREDELLA. 391 
both the occiput and the foramen are the extensive postgenae 
which extend to the vertex above and more narrowly between 
the maxillae and cheeks, or genae proper, to the lower margin of 
the latter below, and constitute the greater part of the wall of 
the hinder aspect of the head. 
The maxillae and labium are of the usual mandibulate type, and 
their respective palpi are composed of six and four segments. 
The maxillary palpi are much longer. 
The antennae (PI. 5, fig. 8) are generally long and slender and, 
as a rule, distinctly longer than the head and thorax (taken from 
the anteriormost portion of eye to posterior margin of the meta- 
episternum). Sometimes, however, as in redimacula (Mac- 
Gillivray) , they are but slightly longer than the head and thorax, 
and sometimes, again, as in xaniha (Norton), they are about 
equal to the same. They are always composed of nine segments. 
The first or basal segment is subcylindrical, short, stout, and is 
borne upon a contracted basal portion or stalk. The second is 
somewhat beaker-shaped, and is the s*hortest of the nine segments. 
The third segment is the longest, and is always considerably longer 
than the next succeeding or fourth segment. The relative length 
of these two segments varies among the individuals of the same 
species and is apparently valueless as a specific character. The 
apical segments are more slender, and are more or less attenuated 
at the end, giving the antennae a setaceous appearance. 
The head (excepting the clypeus, labrum, and mandibles, 
which see) is rather densely clothed with short, fine, erect, silvery 
hairs which issue from minute punctures. The vertex is usually 
more coarsely punctate. On the antennae beyond the second 
segment the hairs are very short and only sub-erect. 
Thorax. 
Plate 5, figs. 7, 9. 
Prothorax. — The pronotum conveniently divides itself into 
two parts: (1) an anterior region, narrow dorsally but broadened 
out laterally, which occupies the cervical or neck region ; and (2) 
a posterior region — the collar, — which extends to the meso- 
thorax. The collar is deeply emarginate medially on the dorsal 
surface, so that it consists principally of two dorso-lateral lobe- 
like pieces, one on each side, each of which extends back as far as 
