94 GEOL. AND NAT. HIST. SU&VEY OF MINNESOTA. 



First Fket. 



ex. 2 spines. (ex. 1 seta. 



Outer ramus -j ap. 2 setje. Inner ramus ■< ap. 1 spine, 1 seta, 



in. 2 setae. I in. 3 sefse. 



Second Feet. 



(ex. 2 spines. C ex. 1 seta, 



ap. 1 spine, 1 seta. Inner ramus < ap. 1 spine, 1 seta, 



in. 3 seise. i in. 3 sette. 



FoL'ETH Feet. 



!ex. 2 spines. f ex. 1 seta. 



ap. 1 spine, 1 seta. Inner ramus < ap. 2 equal spines. 



in. 3 selje. ( in. 2 setai. 



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 C. 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 

 XXXIII. 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 ofiset 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 antennae 

 in this form are about as long as the 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. vernaUs. 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. 



Length 1.4 to 1.5 ram. 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., antennae 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 G. hrevispinosus Herrick, and it is not certain 

 that this has not already happened to some extent. 



