100 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
Hoek ’78 (brevicaudatus); Brady ’78 (pulchellus, and strenuus); Herrick ’84; 
Daday ’85 (claudiopolitanus, hungaricus, paradyi, elongatus, and strenuus); Vos- 
seler ’86 (lucidulus, bodamicus, and strenuus); Sostaric ’88 (quadricornis) ; Thall- 
witz ’90 (lucidulus); Lande ’90 (vicinus, and strenuus); Richard ’91; Branly 91 
(abyssorum, vicinus, and strenuus); Schmeil ’91 and ’92. 
This species is said to be one of the most abundant on the continent 
of Europe and assumes a great variety of forms whose relations are 
far from clearly understood. 
The cephalothorax is large, and the fourth and fifth segments pro- 
ject laterally. The abdomen is five-eighths as long and tapers distally. 
The stylets are slender, divaricate, longitudinally ridged above and 
about as long as the last three segments of the abdomen. The two 
median sete are relatively sbort, the inner apical being as long as the 
stylet and twice as long as the inner apical or more. Lateral seta 
small, not far from the end. The antenne reflexed scarcely reach the 
base of the third segment. The fifth foot is two-jointed, the basal seg- 
ment being small, nearly quadrangular and armed with a short ciliate 
seta. The apical segment is longer, with one long apical seta and a 
lateral spine. Length 1.5 to 2.5 mm. Schmeil observed a specimen 
3.2 mm. long. Schmeil unfortunately places no reliance on the arma- 
ture of the feet, which, as Marsh also has shown, are of great import” 
ance and are fairly constant, and his figures and descriptions help but 
little in solving the perplexities of this multiform species. In this 
we are at present the less interested in that the species has not as yet 
been recognized in America. 
Brady gives greater detail and fails to offer valid reasons for sepa- 
rating C. abyssorum and C. vicinus from strenuus, though he inclines to 
believe C. abyssorum a deep sea variety of C. vicinus=C. pulchellus of 
his monograph. 
The formule for the feet in abyssorun are as follows: 
First Foor. 
ex. 2spines. ex. i1seta. 
Outer ramus { ap. 1 spine, 2 setz. Inner ramus + ap. 1 spine, 1 seta. 
in. 3 sete. in. 3 sete. 
THIRD Foor. 
ex. 2 spines. ex. 1 seta. 
Outer ramus jap. 1 spine, 1 seta. Inner ramus ; ap. 1 spine, 1 seta. 
in. 4 sete. in. 3 sete. 
FouRTH Foor. 
(ex. 2 spines. ex. 1 seta. 
Outer ramus ee: 1 spine, 1 seta. Inner ramus 4 ap. 2 spines. 
in. 3 sete (4 sete ?) in. 2 sete. 
The only difference of importance between the two species seems to 
be the shorter antennee of CO. vicinus. 
