DU SO ar ee Re CUM! Perl) Ha ts eee ae a ea 
94 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
FIRST FEET. 
ex. 2 spines. ex. 1 seta. 
Outer ramus 4 ap. 2 sete. Inner ramus jap. 1 spine, 1 seta. 
in. 2 sete. in. 3 sete. 
SECOND FEET. 
ex. 2 spines. ex. 1 seta. 
Outer ramus < ap. 1 spine, 1 seta. Inner ramus ; ap. 1 spine, 1 seta. 
in. 3 sete. in. 3 sete. 
FOURTH FSET. 
ex. 2 spines. ex. 1 seta. 
Outer ramus jap. 1 spine, 1 seta. Inner ramus ; ap. 2 equal spines. 
in. 3 sete. in. 2 sete. 
The fifth foot is two-jointed, the basal joint being short, broad, and 
armed with one seta, while the apical segment is short, fusiform with 
a long seta and short spine. The foot is very like that of ©. viridis, 
but the basal joint is smaller. The abdomen is rather slender, the 
first joint being rather longer than the remaining joint exclusive of 
the stylets. The latter in the average form are rather short and the 
lateral seta is over one-fifth their length from the apex. The outer 
apical seta is three-fourths the length of the inner. The inner median 
seta considerably longer than the outer. In addition to the ordinary 
form with short stylets there are frequently found others which have 
the stylets considerably elongate. Such a form is figured in Plate 
XXXIIT. In this case the stylets are six times as long as wide and 
equal in length the last two and half of the next abdominal segments. 
The small lateral spine is more than a fourth the length from the end, 
and there is a slight unserrated offset at the basal one-fourth exter- 
nally. The inner seta is nearly as long as the stylet, the outer two- 
thirds as long. The inner median seta is three times as long as the 
stylet, and the outer is but twice as long as the stylet. The antenne 
in this form are about as long asthe first segment, which forms nearly 
half the length of the thorax. The abdomen without the stylets is 
half the length of the thorax. 
The form of the receptaculum is transversely oval, very similar in 
fact to C. vernalis. Unfortunately the printer in the preceding edi- 
tion made the description of Plate 24 so read that the figure of this 
structure was credited to C. adolescens. 
Length1.4to1.5 mm. The following measurements of the elongate 
form are given to illustrate the proportions: Length 1.37 mm., thorax 
0.85 mm., first segment 0.41 mm., abdomen (exclusive of stylets) 0.41 
mm., stylets 0.19 mm., antennz 0.45 mm., longest seta 0.50 mm. 
It is possible that the elongate form, which is found in association 
with the type, is to be regarded as a post-imago. There is danger of 
confusing this form with C. brevispinosus Herrick, and it is not certain 
that this has not already happened to some extent. 
