344 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
The pleuritcs are membranous, broad, having the spiracles, of which 
there are eight pairs as usual, the last pair minute. 
Fig. (in text) represents the end of the abdomen of the male of 
Panorpa. 
Suborder 2. Trichoptera. Plates LIX, figs. 1-5; LXL 
Limnephilm . 159 (PL LIX, figs. 1-5.) The head differs from all other 
Plnjloptera in being constructed on a plan closely approaching that of 
the lepidoptera. It is short and high, and of the general proportions 
of the lepidopterous head. The vertex is as long as broad ; the orbits 
wide. The clypeus is small, narrow, and situated high up; the labrura 
(Fig. 5) is small, narrow, elongate, sub triangular. (The exact differ- 
ences from the Lepidopterous head are stated in the American Naturalist , 
Xov. 1871, vol. v, p. 711.) The mandibles are not present in Limne- 
philus, unless a slight pointed tubercle on each side of the lower part of 
the orbits (Fig. — , md ?) may represent them. If so, they are consolidated 
with the epicranium, but I am inclined to think that these do not repre- 
sent the mandibles at all, as rudimentary mandibles in the form of a 
movable tubercle are to be seen in Neuroma on each side of the base of 
the labrum. 160 
The maxillary palpi (Fig. 5) are long and slender, directed down- 
ward; the lobe on the side (Fig 4, lac.) hangs down. It may perhaps 
be the homologue of the lacinia. The labial palpi are three-jointed (Fig, 
5), while the menturn, palpiger, and an undivided rudimentary ligula 
are present. 
The genre are broad on the under side, while the gular region is nar- 
row. The submentum is small and narrow ; the mentum is trape 
zoidal, broadest in front. 
the thorax. 
Limnephilus. The pronotum (PI. LXI, fig. 1) is much as in Lepidopt- 
era, being divided into two transversely oval, narrow bosses by a deep 
median suture. 
Mesonotum. (Fig. 2.) The patagia are thick, solid, rounded oval; 
longer than broad. The prsescutum is obsolete. 
The scutum is long and broad, with a prominent acute angle in tho 
middle on each side. Surface with a deeply-impressed median line ex- 
tending to the scutellum, and with a parallel, lateral impressed line. 
In general form there is a close approximation to the lepidopterous 
mesoscutum. It is deeply excavated behind for the reception of the 
scutellum, which is large, a little longer than broad, and subtriangular, 
The postscutelluin is either wanting or it may be represented by a 
transverse ridge. 
The metanotum (Fig. 3) is much as in the lepidopterous type. It is 
169 A common epecies, L. pudicus Hag. ; identified by Dr. Hagen. 
160 In Neuronia they appear to be nearly of the same form aa represented by Savigny in rrhi/fjanM 
grandis (M6moiroa aur lea Animaux aaua Vert^bica. PI. I, Pig. 1.) In the pupa the mandibles are 
■mch larger. 
