1968] 
Crabill — Eurytion 
229 
Eurytion tenebrosum 4 differs from all known South American 
members of the genus in at least two regards: the second maxillary 
coxosternum bears a pair of lappets; the second maxillary circum- 
foraminal ring, which is notably elongate, is bordered by a vague 
hyaline suture. 
Eurytion tenebrosum (Meinert) 
general. Length, 40 mm. Leg pairs, 55. Color, brownish 
yellow. Shape: last 10 segments slightly attenuate; anteriorly not 
so. antennae. Filiform, not flattened. First 7 articles sparsely 
clothed with long setae; 8-14 densely, shortly setose, cephalic 
plate. Much longer than wide, 24 : 19. Frontal suture absent. 
clypeus. Much wider than long. Fenestra minutely punctate, not 
areolate, with 1-2 inclusive setae. Setae: prefenestrals absent, para- 
fenestrals 1-1, intrafenestrals 1-2, postfenestrals and midclypeals ca. 
6-6. Plagulae absent. labruIm. Small subtriangular midpiece com- 
pletely separating sidepieces. first maxillae. Telopodite lappets 
slightly longer than telopodite. Coxosternal lappets present but 
short, second maxillae. Isthmus shallow, narrow, hyaline, not 
areolate. Mesodistal process absent. Pore surrounded by sclerotized 
rim. Telopodite: basal condyles both present, equal; articles without 
denticles; claw long, simple, curved. 
prehensor. Flexed, projecting well beyond head margin. Tar- 
sungular edge smooth, not serrulate. Denticles : article 4 with prom- 
inent basal tooth ; articles 2 and 3 unarmed ; article 1 with two 
denticles, the distal larger than the proximal, prosternum. An- 
terior denticles yellowish. Pleuroprosternal sutures parallel to sides 
of prosternum. Pleurograms absent, legs. Without dense vestiture; 
articles 4 and 5 each with 3 exceptionally long setae. Parungues: 
anteriors very short, about 1/4 as long as claws; posteriors minute, 
nearly suppressed, sternites. Porefields on 2 through penult; each 
single, subcircular on anterior body third, thereafter double and as- 
suming more posterior positions. 
ultimate pedal segment. Pretergite laterally non-fissate, fused 
with its pleurites. Presternite midlongitudinally weakly suturate. 
Sternite: sides slightly excurved, rear straight. Each coxopleuron 
with three gland complexes, each heterogenous in the form of a 
vague rosette. Telopodite: very slightly crassate, about 1/4 longer 
4 The gender of the generic name has been expressed variously; some 
have considered it neuter, some masculine. That Eurytion is the name of a 
male mythological figure does not alter its being a neuter Greek substantive. 
