208 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
DICTYNIDAE. 
AMAUROBIUS, sp. a. 
An immature male and female from Ollantaytambo (9,000 feet, 
July. M.C.Z.150). The abdomen is marked with a distinct median 
longitudinal black stripe of narrowly hastate form and with indented 
edges and with a bright white spot each side of middle of its length. 
Carapace with head dark brown, elsewhere dusky. Sternum dark, 
dusky brown. 
Two immature males apparently of same species from Urubamba 
(9,500 feet, July. M.C. Z. 151). They are darker throughout, the 
sternum being nearly black and the abdomen so dark that the dorsal 
median black line is almost obliterated; but the two white spots are 
conspicuous. 
AMAUROBIUS sp. b. 
One immature female with lateral eyes nearer together than usual 
in the genus. Carapace yellow with each eye enclosed in black. 
Sternum light brown, a little dusky. -Legs yellow, tibiae very ob- 
scurely ringed. Abdomen grey of olive cast; above conspicuously 
marked with a series of dark chevron lines from middle caudad, all 
of which are broken at middle. 
Locality — Urubamba, 9,500 feet, July. (M. C. Z. 152). 
AMAUROBIUS PLATEI Cambridge. 
Journ. Linn. soc. London, 1898, 27, p. 18, pl. 2, f. 3. 
One specimen probably this species was secured at Ollantaytambo, 
9,000 feet in July. (M. C. Z. 166). 
AYMARELLA,! gen. nov. 
Pars cephalica relatively broad, convex, and high. 
Anterior row of eyes substraight or slightly procurved, the medians 
much smaller than the laterals, farther from the laterals than from 
each other. Posterior row of eyes recurved; subequal, the medians 
1 Diminutive of Aymara. 
