1895. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



599 



ov\y. Tliese serrated iiiaruiiis present a iiotcli in the male (Fiy. S c), 

 but there is none in the female. 



Fig.S. 

 BYBLIS SERRATA. 



(a ) MaxiUipe.l nf fenird.-, ventr.il M.rfa.v ; ( /.) I^ft i.,;in,lihlH of female, median surfa.-e ; (,•) left i.!e,.)>...los of male, only basal portion of 



A eom])arison of tlie sexes may be facilitated by tlie following table 

 exliibitin.u' some of the (liffei'ences: 



Se.nial diffcnuiccx of Jiiibli.s Ntrratd. 



Leiigtli, 11 tnra. 



Superior antennfc one-tliird Icnath ot'bmly. 

 Peduncle: hairs not in tufts. 



No tViiiizc of loiiij hairs at base of (iaoellnin. 



Inferior anteima' tliree-fourtlis U'liuth of boilj'. 

 IVduucle: four-tiftliH of liairs on venfral side; m 

 tufts of liairs; third, joint not swollen. 



Coxie: serration of teetli acute. 

 Incubatory jxiucli present. 



Superior autenniP two-fiftln length of body. 

 Peduncle: brushdilie tufts of liairs. 

 Friimc of lono; bail's at base of ilagelluni. 



Inferior antenna' I4 length of bodj". 

 Peduncde: four -fifths of hairs on dorsal side; 

 brush like tufts of hairs : third joint swollen. 



Coxa': serration of teeth blunt. 



Incubatory poucli absent. 



Last three segments of pleon separated from pe- ' Last three segments of pleoii separated from pe- 



reion by a slight annular constriction: ultinuUe j reion by a deep anmihir constriction; tilliniate 



and antepennltiniate segments without dor al [ and antepenultimate segments with dorsal ele- 



elevations. vations. 



Last i)air of api)endages very diHerent in male and female. 



BYBLIS AGASSIZI, new species. 



About June 20, I obtained a dozen Am])iiipods that mi,uht be readily 

 taken for the males of lUjhIi.s lo7ujicoriiis, for their inferior anteiniie 

 Avere longer than their bodies and they lacked pigment eells. 



Type.—yo. 18919, U.S.N.Ar. 



The male of />. lo)u/icornis has not, so far as I can lind, been desciibed. 

 It might therefore appear that these specimens were the undiscovered 



