14 354 



2. C. lacustris nob. ($). 



Annulus genitalis fæminæ brevior et latior, margine postico recto; cauda longior, gra- 

 cilior; seta ultima pedum quarti paris longisssima, haud serrata. 



3. C. Balistæ nob. [$ $). 



Annulus genitalis fæminæ formå fere præcedentis, margine postico tamen profunde 

 concavo, maris semilunaris, margine posleriore valde concavo et inciso, angulis externis 

 acutis ; cauda brevis, lata; setæ pedum quarti paris omnes eadem fere longitudine, 

 graciles, longissimæ. 



**) Pedes abdomioales quarti paris quinque setis instrueti, cauda plus minus elongata, 



biarticulata vel unarticulata. 



4. O. productus Dana (%.) 



Annulus genitalis lageniformis, margine posteriore profunde inciso; cauda elongata, 

 biarticulata; pedes quarti paris ramo biarticulato, setæ ejusdem leniter curvatæ, 

 longitudine sensim crescentes, ultima ceteris vix longior. Setæ plumosæ in pedibus 

 primi paris nullæ! 



5. C. isonyx nob. (|j>.) 



Annulus genitalis lageniformis, margine posteriore recto; cauda brevior, haud articulata ; 

 pedes quarti paris ramo triarticulato , setæ leniter curvatæ, prima ceteris, longitudine 

 sensim crescentibus, paulum inæqualibus nonnihil major. 



6. C. rapax M. Ediv., Baird. ($ $.) 



Annulus genitalis fæminæ lageniformis, margine posteriore recto, maris ovalis ; cauda 

 fæminæ brevior haud articulata, maris longior, biarticulata, articulo primo breviore; 

 seta prima pedum quarti paris fere recta, ceteræ leniter curvatæ, ultima ceteras vulgo 

 plus duplo superans. 



b. Foliolis caudalibus anum haud superantibus. 



7. C. Coryphænæ nob. ($ $). 



Hamuli accessorii antennarum desunt; spina ad basin rami externi pedum tertii paris 

 plane recta; annulus genitalis fæminæ elongatus, supra figura scutiformi dorsuali 

 notatus, angulis posterioribus in lobos sat magnos productis, maris latus, brevis, angulis 

 posticis prominentibus; cauda fæminæ elongata, quadriarticulata, maris brevis biarticulata; 

 setæ caudales latissimæ; setæ plumosæ filiformes, longissimæ in apice antennarum primi 

 paris nec non in angulis posterioribus annuli genitalis in utroque sexu; pedes quarti 

 paris ramo triarticulato, setæ quinque leniter curvatæ, pectinalæ. 



