832 CHARLES Paut ALEXANDER 
The larvae were conspicuous by their dark coloration and, when placed 
in water, by their active, snakelike movements, in this regard being very 
different from somewhat similar larvae of certain Eriopterini which they 
resemble superficially because of the five subequal lobes surrounding the 
spiracular disk. The indoor pupal period is six days (May 8 to 14, 1917). 
Larva.— Length, 9-11.2 mm. 
Diameter, 0.75-0.9 mm. 
Coloration dark brown, sutures pale; pale spots on dorsum and on sides of body; spiracular 
disk pale, lobes marked with darker. 
Form rather stout, terete (Plate XX XI, 132). Body densely covered with a long, appressed, 
dark pubescence. Prothoracic segment narrowed in front, long, divided into two rings by 
a faint constriction; mesothoracic and metathoracic segments gradually Jonger. First 
abdominal segment shorter than last thoracic segment; abdominal segments 2 to 7 long, 
each divided into two narrow annuli by a deep constriction which is destitute of hairs but 
has just before it a sharp, transverse ridge of stiff hairs; short, incomplete ridges of these 
stiff hairs on dorsum of anterior ring; anterior ring about half as long as posterior ring; on 
ventral side of each of segments 2 to 7 on anterior ring, a transverse swelling, these swellings 
becoming more convex and prominent on posterior segments; swellings appearing aimost 
smooth, being covered only with microscopic, roughened points; posterior ring with a sharp 
ridge of hairs at about two-thirds its length. Chaetotaxy as follows: dorsal segments with 
short setae at about midlength of posterior ring; a single rather stout, black bristle on pleura 
of anterior ring, immediately above transverse swellings; a similar seta on posterior ring; 
two groups of very long, delicate setae on ventral face of posterior ring, one on each side of 
the ridge of erect bairs; thoracic segments approximately similar to abdominal segments, but 
sternal setae at about midlength even more prominent. Last segment of body elongated, the 
spiracular disk (Plate XX XI, 136) surrounded by five lobes; dorsal lobe the smallest, rather 
blunt, inner face with a brownish, triangular-oval mark; lateral lobes of medium length, 
inner face suffused with brown, which is darkest, almost black, on lower edge of lobe; ventral 
lobes the longest, inner face of each with two broad, parallel, blackish lines, separated by 
a somewhat narrower pale line; entire disk fringed around with long, dark-colored hairs, 
which are longest near tips of lobes, where they are strongly recurved, almost pencil-like; 
fringe continuous between dorsal and lateral lobes, but between ventral and lateral lobes, 
and between the two ventral lobes, hairs toward base of each lobe very short to lacking; 
ventral lobes just before tips with a single long sensory bristle. Spiracles large, subcircular, 
situated at base of lateral lobes, dark-colored, narrowly margined with pale. Anal gills 
consisting of two pairs of pale, stout, cylindrical lobes, tapering toward tips, before which 
there is a slight constriction. 
Head capsule massive and compact, of the normal generalized limnobiine type. Labrum 
large, conspicuous, transverse, densely fringed with long hairs; on epipharyngeal region, 
a large, dense tuft of moderately elongate hairs on either side of median line. Mentum 
(Plate XX XI, 133) not completely divided, but with a very deep split behind, a large median 
tooth, and two smaller teeth on either side; behind (dorsad of) elongate median tooth, a 
slightly wider flattened lobe whose margins extend beyond those of outer tooth. Hypo- 
