4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
Veckham — Revision / of the Attidce of North America. 377 
Spines under tibia I 2-2 or more. 13 
Less than two pairs of spines under tibia I, sometimes one 
pair and one or two serially behind (Admestina, 
Agassa, Salticus, Icius similis, Habroeestum pulex, 
Marchena minuta $, Marchena sissonii, Pseudicius 
monticolus, Pseudicius piraticus) . 5 
Four spines under tibia I, one pair and two, serially, be¬ 
hind; legs 4312. Habroeestum pulex 
Less than four spines under tibia I. 6 
No spines on tibia I . 7 
Tibia I with at least one spine . 8 
Cephalic part occupying only 1-3 of cephalothorax; tibia 
I enlarged; legs 4132 ... Admestina 
Cephalic part occupying a little more than 1-3 of cephalo¬ 
thorax; tibia I not enlarged. Abdomen either entirely 
covered with iridescent scales or marked with trans¬ 
verse or oblique white bands . Salticus 
Tibia I with one anterior lateral spine only. 9 
Tibia I wjth at least one spine below. 10 
Abdomen with narrow white longitudinal band on each 
side of middle. Marchena sissonii 
Abdomen with wide central longitudinal band . 
Pseudicius piraticus 
Cephalic part plainly longer than thoracic; one spine or 
rarely two under tibia I . Agassa 
Cephalic part plainly shorter than thoracic; three spines 
under tibia I . 11 
Legs white with dark longitudinal lines . Icius similis 
Legs brown or yellowish-brown, more or less ringed, not 
lineate .. 12 
Fourth leg longest, third next . Marchena minuta $ 
First leg longest, fourth next. Pseudicius monticolus 
Two pairs of spines under tibia I, rarely with one anterior 
lateral (includes Metacyrba, Sassacus Papenhoei, 
Habroeestum acerbum, part of Icius similis and part 
of Pellenes) . 14 
More than four spines under tibia I . 18 
Third leg longest . 17 
Fourth leg longer than third . 15 
Eye-region occupying 1-2 cephalothorax, plainly wider be¬ 
hind. Fern. I much enlarged . Sassacus Papenhoei 
Eye-region occupying less than 1-2 cephalothorax . 16 
Eye-region with sides nearly parallel. Femur patella and 
tibia of first leg much enlarged . Metacyrba 
Eye-region wider behind. Fern. I slightly enlarged... Icius similis 
Abdomen very wide and short, marked with a white basal 
band above a black band, two round white spots on 
middle, and, further back and more widely separated, 
two smaller white spots. $ 2.5 mm., $ 4.5 
mm. Habroeestum acerbum 
Size larger, and form and marking of abdomen -different 
from the above.part of Pellenes 
