08 mm), the posterior pair is anteriad
of anterior fr-orb.
Pronotum: Much wider than long, strongly declivous anteriorly; anterior collar distinctly developed, delimited posteriorly by a deep transverse furrow, lateral portions thickened; lateral margin narrowly explanate, not projecting anteriad and ventrad, but distinctly elevated dorsad around its middle, distinctly emarginated anteriad of humeri in dorsal view; humeral angle rounded, obtuse, distinct; posterolateral angle very broadly rounded, obsolete (Figs.
Head ochraceous, mandibular plate broadly margined with brown laterally along entire length and medially at its apical portion; clypeus dark brown; base of head blackish brown, outline of blackish area projecting anteriad before ocellus.
Belonuchus aluticollis may be identified by its head as long as wide, the second antennal segment shorter than the following segment, the pronotum slightly narrowed anteriad
and the front tarsus as long as the front tibia.
Penis: Glans bent dorsad to shaft, stylus slightly anteriad
Genus description, worker: Head slightly to clearly longer than wide, narrowing anteriad
Additionally, in the Recent sample available (in both ROM Mammalogy and Palaeobiology), the anteriad
curvature of the anterior enamel portion of each buccal bay suggests Lemmus, as this enamel portion is straighter in both Synaptomys species.
1A) has six dorsal stripes with colors grading from cream anteriad
to tan posteriad, a partial tan vertebral (seventh) stripe extending from the occipital region to one-sixth the length of the trunk, cream-beige spots in the upper lateral and dorsolateral fields, bluish-brown dorsal surfaces of the hind limbs and tail, bluish-gray ventral surfaces of the throat, abdomen and distal one-half of the tail, 88 granules around midbody, 209 granules from occiput to rump, five granules separating the paravertebral stripes, 5.
5 times as wide as head at widest point; pronotum slightly narrowed anteriad
to parallel-sided (Figs.
TEXTURE: Impunctate, polished, callosite region of pronotum and corium anteriad
to orangish brown marking, shagreened.
Skin of top of head and back smooth as is skin of upper surfaces of limbs, becoming feebly granular laterally on head and body as well as on lowermost back; no dorsolateral folds; skin of throat smooth, that of venter and posteroventral surfaces of thighs areolate; discoidal folds present, well anteriad
of groin; no ulnar tubercles; palmar tubercle bifid, much larger than oval thenar; supernumerary palmar tubercles low, numerous; subarticular tubercles subconical, round; fingers bearing lateral fringes or keels; disks round, about 1 1/2 times width of digit below disk (narrower on thumb), bearing complete ventral pads; males lack nuptial pads.
Skin of dorsum finely shargeen with scapular tubercles and thin dorsolateral folds (least evident posteriorly); skin of flanks bearing more numerous larger tubercles on shagreen background; skin of venter smooth but with granulations posterolateral and posteriorly; discoidal folds evident, well anteriad
to groin; no anal sheath; pair of conical supraanal warts (Fig.