228 TENTH ANNUAL EEPORT 



same gathering (for m so far as we have observed they occur together 

 where circamstaiices permit a full development,) the corona t us -form is 

 larger and carries more numerous eggs. No 3^oung with the serrated 

 antennae have been seen, though searched for diligently. On the other 

 hand j^oung forms of tenulcornis abouud, and we have seen females 

 with incompletely grown antennae with egg-sacs. In view of these 

 and similar facts, we feel justified in considering coronatus probably a 

 post-imago ol teiuiicorms. 



Cephalothorax broad; abdomen rather slender; antennae reaching 

 about to base of throax, attenuated at the end; terminal joint with a 



knife-like ridge; formula — ^^ ^^ — r^-' — v^v^s^^^^^^^^ 



— ; fifth foot composed of a long basal joint bearing a long spine and 

 a terminal three-spined division; caudal stylets over twice as long as 

 last abdominal segment; setc^ all nearl}' terminal, inner one much 

 longer than usual, length I'oj cm. 



Common in America, England and continental Europe. 



CYCLOPS ATER, U. Sp. 



(Plate III, figs. 9-12.) 



Length about ili) cm; antennae as long as cephalothorax, /uj cm., slen- 



-der and gradually tapering; formula* — — ^^ -^ — ^ ^ ^ ^^ r 



— ^^ ; terminal joints rather short; the last joint furnished 



with a knife-like ridge as in tenulcornis; second antennae much as in 

 tenulcornis; maxillipeds rather large; fifth foot one-jointed, armed with 

 'three subequal spines; abdomen rather short, last segment very short; 

 stylets somewhat elongated; setae rather short, lateral seta near the 

 ■end; eggs pale; color deep blue or gray. 



This beautifiil and very distinct species is found in '' Mud Lake " in 

 Hennepin county, with Cyclops signatus. The large very dark cephalo- 

 thorax and shortened abdomen make it conspicuous. The one-jointed 

 fifth foot, shape of the operculum vulvae in connection with the short- 

 ened joints of antennae and characters of the caudal stylets, make the 

 species sufficiently distinct from any other. 



CYCLOPS INGENS, Sp. nOV. 



(Plate ly, figs. 1-8.) 



A large species perhaps too near C gigas, or C. brevicornis Glaus, 

 but differing from the former as to the length of antennas and stylets 



*lVoTE The accent marks are used to signify that joints represeated by them (counting ft'ora base) 

 . are either long — , short ^, medium :=:• 



