PHALANGES OF THE UNITED STATES. 39 



SYNOPSIS OF THE KNOWN NORTH AMERICAN 

 PHALANGES. 



Family PHALANGID-SJ. 

 GENUS I. PHALANGIUM Linn. 

 Cephalothorax with two eyes. 



* Second pair of legs over 2.25 inches long. 



1. P. DORSATUM Say. Dorsu/n somewhat tuberculate, reddish 

 brown or grayish with a strongly pronounced blackish central mark- 

 ing. Palpi reddish brown, with edges strongly crenulate. Tro- 

 chanters black. Length of body, ?,0.3; <J, 0.2. Length of second 

 pair of legs, ?,3; $, 2.4. 



2. P. VITTATUM Say. Dorsum as in last, more tuberculate, harder. 

 Palpi very 'long, reddish brown, edges strongly crenulate. Tro- 

 chanters reddish brown. Length of body, ?,0.4; $, 0.25. Length of 

 second pair of legs, ?, 3.2; $, 3.2. 



3. P. NIGROPALPI Wood. Dorsum reddish brown, in male uniform ; 

 in female with an illy pronounced central marking. Palpi, in male, 

 blackish; in female brownish, not strongly crenulate. Length of 

 body, ?,0.3; <?,0.2. Length of second pair of legs, ?,3.1; $, 3.1. 



4. P. EXILIPES Wood, $. Dorsum reddish brown, uniform, or with 

 light spots, minutely tuberculate. Palpi light grayish brown, with 

 very small blackish tubercles. Trochanters dark reddish brown. 

 Length of body, 0.25. Length of second pair of legs, 2.7. 



5. P. CINEREUM Wood. Dorsum with spinous tubercles, grayish, 

 with a central dark vase-shaped marking. Palpi light brown, with 

 numerous short rigid black hairs. Trochanters grayish. Length of 

 body, ? , 0.35 ; ~$, 0.3. Length of second pair of legs, ? , 2.00 ; $, 2.6. 



** Second pair of legs not more than 2.25 inches long. 



6. P. CALCAR Wood, $. Second joint of palpi with a long robust 

 spur-like process. Dorsum reddish brown. Length of body, j).25. 

 Length of second pair of legs, 2.20. 



7. P. BICOLOR Wood, ? . Dorsum blackish, uniform. Ventral sur- 

 face whitish. Palpi with scattered tubercles. Length of body, 0.2. 

 Length of second pair of legs, 2.1. 



13. P. VENTRICOSUM Wood, $ % Dorsum reddish brown, with an 

 obscure central marking. Trochanters light brown. Length of body, 

 0.4. Length of second pair of legs, 2.2. 



