4C8 NEW YORK STATE MUSEUM 
base is a branched hair. The mandibles forming the sides of the 
mouth opening; each possess two stout, elongate, and four or 
five shorter black teeth at the apex, a little below which is a 
ridge with a serrated edge (not shown by Nuttall). Overhang- - 
ing the teeth are three scythe-shaped rays, and between their 
bases and the base of the teeth are a number of brown hairs and 
one or more curved spines with a serrated inner edge. Project- 
ing inward from about the middle of the mandikle is a fan of 
hairs, and usually also several branched hairs are to be found 
on the outer margin. 
The maxillae (first pair) each consist of a quadrangular piece 
with curved hairs on the cephalic, and straight ones on the inner 
margin. On the inner cephalic angle are several stout setae; the 
palpus is a conical process covered with short hairs, with three 
elongate spines at the tip connected by a web, and several 
shorter bristles. Laterally, near the tip, is a hair having four 
branches, each branch with several twigs. The maxillae 
together with the labium (underlip of Meinert) form the floor 
of the mouth cavity. The labium is a chitinized piece with seven 
to nine teeth on the cephalic margin, forming a continuation of 
the ventral wall of the head, to which it is articulated [pl.42, 
fig 3]. A small toothed piece, in outline resembling the labium 
but with fewer teeth, lying just inside of the latter, is what I 
take to be the hypopharynx (not shown in figure). Meinert in 
his work on Myggelarver [pl.41, fig.24], shows both of these, the 
one slightly displaced in dissection. The thorax is rounded, its 
segments obliterated. Twelve long feathered hairs stand on 
the dorsal surface besides some smaller- ones and several sim- 
ple hairs [pl.42, fig.2]. The nine segmented abdomen is provided 
with a number of feathered hairs besides many bristles. The 
first two segments each have two long feathered hairs on each 
side, the third has one(in all specimens examined); the fourth and 
fifth on each side, each with three or four simple hairs united at 
the base, the sixth, seventh and eighth, with but one or two, be- 
sides these there are two or three short feathered hairs, and sev- 
eral short, simple ones on each side of each segment. The only 
difference which I have observed in the hairy armature of the ab- 
domen of this species and maculipennis [figured by Nuttall, 
Journal of Hygiene, v.1, pl.2, fig.4] is the presence of one or two 
more of the long, simple hairs on the sides of segments 4 
and 5. The “palmatte hairs” on the sides of 3,to 7 mentioned 
by Nuttall are also present in this species [pl.42, fig4a]. On 
the posterior half of the dorsal surface of the eighth segment 
is the complex respiratory apparatus which surrounds the two 
stigmata [p1.42, fig.1]. In front of the two stigmata is a brown, 
