A nth essius — I LLG 
367 
pansions. Anterior and posterior margins of 
segment about equal width, greatest lateral ex- 
tent over 3 times width of anterior margin. 
Median mass of segment not notably intruded 
on by reproductive structures, these occupying 
most of each strong lateral protrusion. Dor- 
sally on each lateral process 1 or 2 spermato- 
phores usually seen in persistent attachment. 
Each spermatophore elongate, ovoid, length 
about 3 times greatest width, with gradual taper 
to apical filiform attachment stalk, about .3 times 
as long as spermatophore proper. 
Elongate egg sacks, about .73 as long as the 
body and with width only .05 length, hence of 
pronounced filiform aspect, attaching near pos- 
terior margin of each process of genital segment. 
In remainder of urosome anterior 2 of 3 ab- 
dominal segments subequal, much smaller than 
anal segment. Latter almost 2 times as long as 
next anterior and with distinctive flaring out- 
line, greatest width, just subterminal, 1.5 times 
width of anterior margin of segment. 
Antennule ( Fig. 93 ) long, somewhat flat- 
tened, 7-segmented, fifth segment with notable 
expansion of outline. Approximate proportional 
lengths of segments, basal to distal: Segment I, 
2.5; II, 4; III, 1; IV, 3.3; V, 2.7; VI, 1.7; VII, 
1.4. Setae varying in length. Count of setae, per 
segment: Segment I, 4 setae; II, 7 setae near 
base of segment, 8 around distal end; III, 5 setae; 
IV, 3 setae; V, 4 setae, 1 aesthete; VI, 2 setae, 
1 aesthete; VII, 6 setae, 3 on basal prominence of 
segment, 3 setae and 1 aesthete apical. 
Antenna (Fig. 94) with segmental composi- 
tion much obscured by flexures, involving in- 
tegumental folds, and torsions of regions of 
appendage, probably essentially 3 segments. 
Basal segment not clearly defined, apical articu- 
lation incomplete, 1 short external seta apically. 
Second segment with very complicated distal 
articulation, this proceeding diagonally across 
appendage; 1 short seta on external margin. 
Terminal segment with cuticularized ridges and 
folds and with very broad distal margin furnish- 
ing insertion for 4 elaborately articulated claw- 
like elements and 2 setae. Another seta near 
distal margin. A subapical group of 4 setae of 
diverse lengths. Total elements: 4 claws, 7 setae. 
Mouthparts compactly and intricately ar- 
ranged in oral area (Fig. 95). Labrum with 2 
lobes, overlying blades of mandibles. Basal struc- 
tures of labrum complex, associated with other 
sclerotized pieces located postorally, to form an 
intricate mouth apparatus (Fig. 96). 
Mandible (Fig. 97) a flat plate, with very 
cuticularized anterior and posterior margins. Ap- 
pendage terminating in long lashlike blade with 
complicated marginal ornamentation. Most basal 
elements of ornamentation flat platelike struc- 
tures articulating with margin of appendage. 
Remainder of ornamentation a long graduated 
row of denticles. On anterior margin of man- 
dible articulated a long lashlike auxiliary seta 
with conspicuous marginal cuticularization. Basal 
two-thirds of outer margin bearing graduated 
row of spinules. Between apical lash and auxil- 
iary seta a flat cuticular piece with indented 
distal margin, forming an outer lobe with acumi- 
nate apex and an inner lobe with rounded ter- 
minal outline. 
Maxillule ( Fig. 98 ) of characteristic type for 
genus, an elongate lobe with flaring apex. On 
apex a more medial spine and very long lateral 
seta. A medial apical indentation setting off a 
blunt medial subapical lobe. Margins of ap- 
pendage much sclerotized, produced into spine- 
like cuticular processes apically and on medial 
lobe. 
Maxilla (Fig. 99) with very long articulation 
with body, resulting in characteristic basal seg- 
ment, on which articulates flattened apical seg- 
ment, with heavily cuticularized margins. Apex 
produced in sharp angle anteriorly with tooth- 
like expansions of marginal cuticle forming a 
medial saw-edge. Five to 7 large teeth formed 
by flangelike protrusions of cuticle. Apex pro- 
duced as more elongate spinelike process. In- 
serted at base of angle of curvature of this 
segment and lying on surface, a stout, short 
articulated spine. 
Figs. 104—116: Anthessius fitchi, new species. The scales accompanying certain figures represent 0.1 mm. 
Female: 104, first leg; 105, second leg; 106, third leg; 107, fourth leg; 108, fifth leg; 109, sixth leg; 110, 
caudal ramus. Male: 111, first leg; 112, second leg; 113, third leg; 114, fourth leg; 115, fifth leg; 116, 
caudal ramus. 
