NEW SPECIES OF ISCHIOSCIA FROM VENEZUELA 
Genital papilla. Ventral shield slightly surpassing terminal spatula 
(Fig. 4, Gen). 
ETYMOLOGY. The species name refers to the conspiciously darker 
profrons, compared to the colouration of the cephalothorax. 
Ischioscia hirsuta sp.nov. 
Figs 5-8 
MATERIAL EXAMINED. Holotype, male (body length 11mm): An- 
des, Mesa cerrada between La Puerta and Timotes, 9°00.26'N 
70°44.20'W 1800 m +/— 200 m, on the bank of a brook under stones 
and moist leaf litter, sugar cane, shrub with climbing plants, Polygon- 
aceae, Poaceae, leg. C. Schmidt 23.03.1998; Paratypes: 14 males, 10 
females (with marsupium), 6 females, 2 immatures: same data as 
holotype; 6 males, 19 females (with marsupium), 15 females/ 
immatures: Andes, road from Timotes to Mérida, 8°53.72'N 
70°47.99'W 3400 m (+/— 500 m), very steep northern slope, covered 
with Bryophyta, Pteridophyta, Poaceae, Ericaceae, between Bryo- 
phyta, leg. C. Schmidt 23.03.1998 (MNHG); 3 males, 2 females (with 
marsupium), 10 females, 2immatures: Andes, 8°43.12'N70°46.04'W, 
on the bank of a brook near cattle meadow, srcub with Asteraceae, 
Rubus, one specimen submerged, leg. C. Schmidt 24.03.1998 
DESCRIPTION 
Colour. Ground colour chestnut with many light markings on 
cephalothorax and pereonites, coxal plates of same colour, dark 
brown band in the medial line of each pereonite, pleon bearing some 
light spots. 
Cephalothorax. Linea frontalis lacking, lamina frontalis and linea 
supra-antennalis prominent. Vertex smooth with plenty flagelliform 
tricorn-like setae, laterally protruding compound eyes composed of 
22 ommatidia in four rows (Fig. 5, Ctf). 
Pereon. Tegument smooth and shiny, bearing many flagelliform 
tricorn-like setae, coxal plates I to [V caudally rounded, coxal plates 
V to VII increasingly pointed, sulcus marginalis present, no gland 
pores nor noduli laterales discernible in light microscope at 400x 
magnification (Fig. 5, Cx4). 
Pleon. Set back from pereon despite neopleurae of pleonite 3 to 5. 
Pleotelson rather pointed, lateral margins concave, some tricorn- 
like setae near the apex. 
Antennula. Similar to other species of genus (Fig. 5, An1). 
Antenna. Flagellum three-articulate, with proximal article long- 
est, somewhat shorter than pedunclular article 5, apical organ longer 
than distal article, length ratio of peduncular articles similar to next 
species (Fig. 5, An2). 
Mandible. Pars intermedia bearing coniform setae and two penicils 
on left, one on right side, additional plumose seat proximally, molar 
penicil consisting of about 7 branches (Fig. 6, Mdl/r). 
Maxillula. Medial endite with two stout penicils apically and a 
short subapical tip, lateral endite with 4+6 teeth apically, 5 of inner 
set cleft, on caudal side, a hyaline lobe, stalk and two subapical teeth 
present (Fig. 6, Mx1). 
Maxilla. Lateral lobe slightly broader than medial, bearing faint 
trichiae and pectinate scales, lateral area of rostral side seta-free, 
medial one densely covered with trichiae, medial setal tuft present, 
apically cuspidate (Fig. 6, Mx2). 
Maxilliped. Basipodite with sulcus lateralis and many tricorn-like 
setae, palp with proximal setal tuft small, medial one stalked, as 
prominent as distal one, proximal article bearing a long and a very 
short seta, endite covered with trichiae, on rostral side with knob- 
like penicil (Fig. 6, Mxp). 
Pereopods. Slender with many sensory spines on medial margin 
(Fig.7, PE1—7), pereopod | carpus with antenna-grooming brush, 
143 
propus with antagonistic device, dactylus with long inner claw, 
dactylar seta apically plumose (Fig. 8, Dac). Sexual differentiation. 
Pereopods | to 3 with subequally enlarged carpus and setal field 
rostrally, merus | to 3 with medial setal field, propus 2 with small 
setal field. Pereopod 7 ischium with prominent setal brush on 
proximal half medially, very long trichiae inserted on the more 
rostral surface, distally connected with a small cuticular clasp, 
bordered by small depressions, caudally a row of small trichiae, 
medio-distally with a lobe covered with short trichiae, laterally two 
sensory spine, third spine more caudodistally, basis 7 medio-distally 
with setal field around distal sensory spine. 
Pleopods. Pleopod endopodites slightly bilobate, exopodites with 
about 10 sensory spines laterally, pleopod 5 with creel of three rows 
of pectinate scales caudally, protopodites 3 to 5 with medial protru- 
sion, protopodites 4 and 5 lacking rudimental epipodite (Fig. 8, 
PL1-—5). Sexual differentiation. Male pleopod | exopodite triangular 
with rounded medial edge, lateral point small, incision proxmally 
bordered by small protrusion, endopodite slender with lateral row of 
spines, apex with prominent tooth rostrally, faint trichiae caudally, 
medial protrusion subapically. Pleopod 2 exopodite as in other 
species, with minute pectinate scales medially, endopodite pointed. 
Uropod. As in other members of the genus. 
Genital papilla. Ventral shield slender, terminal spatule not sur- 
passing ventral shield (Fig. 8, Gen). 
ETYMOLOGY. The species is named for its long tricorn-like setae 
on the pereonites, giving it a hairy appearance. 
Ischioscia colorata sp.nov. 
Figs 9-12 
MATERIAL EXAMINED. Holotype, male (body length 14 mm): 
Aragua, Parque Nacional Henri Pittier, Road from Rancho Grande 
to the seaside, near Capilla Virgen del Carmen, mist forest, near 
brook and cascade in moist leaf litter and under stones, leg. C. 
Schmidt 14.03.1998. Paratypes, 10 females (with marsupium), 2 
females, 2 immatures: same data as holotype; 6 males, several 
immature males, 8 females, 4 immatures: Parque Nacional El Avila, 
10°33.01' N 66°53.88' W, high in the mountains at 1700 m (+/— 200 
m), within leaf litter near cliff, leg. C. Schmidt 10.03.1998. 
DESCRIPTION 
Colour. Pereonites chestnut with coxal plates slightly darker, many 
light spots of the muscle insertions and other light areas on coxal 
plates and neopleurae conspicuous, umber medial line, cephalothorax 
chestnut with light patches. 
Cephalothorax. Like other Venezuelan species of this genus, linea 
frontalis reduced, linea supra-antennal conspicuous, slightly bent 
above antennal sockets, compound eyes large, comprising about 26 
ommatidia, vertex bearing several long tricorn-like setae (Fig. 9, Ctf). 
Pereon. ‘Tergites smooth and somewhat shiny, sparsely covered 
with tricorn-like setae, coxal plates fused without groove. Coxal 
plates 1-3 caudally rounded, 4~7 increasingly pointed. No noduli 
laterales visible in light microscope at 400x magnification (Fig. 9, 
Cx4). 
Pleon. Set back from the pereon, neopleurae of pleonite 3—5 well- 
developed. Pleotelson pointed with latero-distal margins concave. 
Tip of telson tapered, bearing tricorn-like setae of various length. 
Antennula. Three-articulate, first article strongest, with distal 
shield, distal article coniform, bearing at least 5 rows of aesthetascs 
(Fig.9, An1). 
Antenna. Flagellum composed of three articles, proximal article 
of half the lentgh of flagellum, distal one shorter, bearing slightly 
longer apical organ. Peduncular articles 4 and 5 almost subequal, 
