No. 463] NORTH AMERICAN INVERTEBRATES. 441 
basis rather slender, or ordinary neni 14 proboscidial nerves; cere- 
bral sense organs very large . pacificus Coe, B', A', C!, 47-97. 
9. With numerous spots and € on peas surface. 
Rather broad and flat ; whitish, thickly mottled with dark brown blotches 
and dots; ventral surface whitish ; basis of central stylet bell-shaped. 
broad and flattened posteriorly ; stylets slender; 17 proboscidial nerves 
A. nebulosus Coe, A. 
10 
9. Dorsal surface without distinct spots . ; 
10. Red, orange, brown, or purplish above; RET or whitish ur 22. 
10. Whitish, flesh-color, yellow, or pale reddish 12. 
11. With 17 to 20 proboscidial nerves ; basis of odes proportions ; 
body short and broad ; dark purplish or chocolate brown above, with a 






A B E D 
Fic. 6.— Outli f heads, showi and arrangement of ocelli. 
A, itt oc and si cel of anh = ventral ec of head respec- 
Que de dorsal re + cee; m, lateral n 
B, Amph P atus. 
^ A. bima: 
D, As de: c, cerebral sense organ. 
triangular white spot on each vm of head ; ventral surface pinkish or 
; flesh-color . A. angulatus (Fabr.) Verrill, B, A, P, X. 
11. With 10 to 12 oiobestiüial n nerves ; body small, rather short and broad ; 
reddish or orange, paler beneath ; ocelli usually only 4 to 8 on each 
side of head ; basis conical, stylets slender. 
A. cali fi Coe, S, S’, 50. 
12. With 10 or 1I Arie nerves 13 
12. With 15 proboscidial ne 
Whitish ; very slender ; ER glands " developed ; intestinal 
caecum short A. paulinus Punnett, B. 
13. Small; of moderate caoporions | whitish, “pale flesh-color, yellowish, 
ochre, or pale orange ; ocelli commonly 10 to 50; basis of central stylet 
bell-shaped ; 10 or II proboscidial nerves . A. flavescens Coe, C, S. 
. Very small and slender ; whitish ; ocelli commonly 10 to 20, in four 
groups; I to 3 accessory stylets in each pouch; 10 proboscidial nerves 
A. similis Coe, C. 
H 
(A) 
14. Central stylet about three fourths as long as basis. 
