804 CHARLES PauL | ALEXANDER 
orange bodies which are very conspicuous, these possibly being fatty in nature; welts on the 
abdomen dark brown; in preserved specimens general coloration fading to a dull yellow. 
Form elongate (Plate XX, 57), tapering behind. Surface with a dense, appressed pubes- 
cence and scattered erect hairs. Prothorax long, narrowed in front, anterior orifice margined 
with dense, fine pubescence; sides of prothorax with numerous long, erect, pale hairs. 
Mesothorax and metathorax indistinctly divided into two approximately equal annuli; 
anterior annulus with a few lateral setae. First abdominal segment short, the setae arranged 
as follows: dorsal, two small grouped setae near posterior margin, laterad of each of these, 
but in alinement, a solitary stout seta, proximad of each of these a stout seta, and cephalad 
of each of these another strong seta, the principal setae of each side thus forming a rough 
triangle; a long, delicate pleural seta on each side; ventral, two small groups of setae, with 
an arrangement similar to that of the grouped setae of dorsum. Abdominal segments 2 to 7 
each indistinctly divided into two annuli by a transverse constriction, the anterior ring abaut 
half the length of the posterior ring and bearing medially a transverse elongate-oval (dorsal) 
to short-oval (ventral) welt, covered with microscopic points; ventral welts very convex 
and swollen; pleura with a long seta; posterior ring with setae arranged as described above 
for first abdominal segment; setae of posterior segments of body longer, but occupying same 
relative position; small solitary inner seta of dorsal posterior line becoming large and prom- 
inent on seventh segment; segment 8 with six powerful setae in alinement on ventral surface, 
situated at base of gills, two being pleural and four ventral in position; dorsum of segment 
8 with a rounded median lobe. Gills four, long, delicate, divided into lobes by constrictions 
(the two caudal lobes, as well as the gills, have taken on a respiratory function). Caudal 
ventral lobes two (Plate X XI, 68) very long, parallel, with scattered setae arranged as fol- 
lows: at tips, six or seven; at about two-thirds length, three; at about one-third length, a tuft 
of from fifteen to twenty long and short setae on lateral and dorsal faces; a small solitary seta, 
dorsal in position, at base of lobe; a similar bristle on ventral face at about midlength of lobe. 
Like remainder of body, cauda covered with an abundance of delicate appressed pubescence; 
on dorsal side, at base of each lobe, a rounded spot, and just inside this a narrow, longitudinal 
line which is destitute of pubescence. Only dorsal lobe the median one of eighth segment, 
mentioned above. Spiracles lacking. 
Head capsule (Plate XX, 58) moderate in size. Lateral plates thin, double, inner one the 
longest, outer one forming mental plate. Dorsal plate broad in front, narrowed behind, 
posterior margin bluntly notched; in front of this plate, two broad plates, rather widely 
separated medially, presumably belonging to clypeus. Labrum broad, cephalic margin and 
ventral face with transverse rows of short hairs. Mentum (Plate XX, 59) conspicuous, deeply 
split behind but not entirely divided as in the Pediciini; an outer flattened, circular median 
lobe whose outer face is covered with small, scalelike roughenings; behind (dorsad of) this 
outer lobe the mentum proper, roughly triangular in outline, conspicuous, margin with a 
broad, blunt, median tooth which is sometimes (Plate X XI, 66) bilobed to form two subequal 
apical teeth; besides this median tooth, four lateral teeth, the outermost one broad with its 
lateral angle rounded. Hypopharynx (Plate X XI, 64) forming a ring into which ducts of sali- 
vary glands open; anterior part, somewhat resembling mentum in shape, a narrow blade 
with anterior margin having about eight teeth; posterior part a transverse, arcuated band 
with anterior margin having about twenty teeth. (In the figure, the two parts of the hypo- 
