716 On Aquatic Carnivorous Coleoptera or Dytiscida. 



aud when this is the case the following joint or two also show the rudiments of 

 similar pubescent bands. 



North America, and Mexico; (Pennsylvania, Louisiana, Kansas, Georgia, sec. Crotch). 1050. 



1120. Cybister ellipticus, Lee, Tragus ellipticus, M.C. — Oblongo-ovalis, parum 

 latus, supra viridi-olivaceus, capite anterius prothoraceque lateribus testaceis, ely tris 

 margine laterali testaceo lato, vix ad apicem attenuato ; corpore subtus rufo-piceo, 

 antennis pedibusque anterioribus testaceis. Long. 28, lat. 142 m.m. 



This species seems very closely allied to Dytiscus fimbriolatus, and shows in each 

 of its sexes almost the same sexual characters as does that species ; it is however 

 of narrower and more parallel form, and is different in colour, the undersurface 

 being more dilute, and the upper surface green, while the yellow band on the elytra 

 is very broad and distinct, and is continued at the apex to the suture ; at about 

 the middle of the wing-case the breadth of the yellow vitta is 2f m.m. being just 

 about one-half of the width of the green ground colour. 



North America, (California). 1051, 



1121. Cybister flavocinctus, Aub4 Tragus fiavocinctus, AI.C. — Ovalis, sat latus, 

 posterius parum dilatatus, supra olivaceo-niger, capite anterius prothoracisque 

 lateribus testaceis, elytris vitta laterali etiam versus apicem argute determinata 

 testacea ; corpore subtus piceo, abdominis lateribus flavo-maculatis, antennis pedibus- 

 que anterioribus rufis, tarsis intermediis pedibusque posterioribus piceis. Long. 

 29 m.m., lat. 15 m.m. 



This species is excessively close to some of the varieties of Dytiscus fimbriolatus 

 (No. 1119) ; the form however is more parallel in outline, and the yellow band of 

 the sides of the elytra is more definite and distinct in its terminal portion, at the 

 apex it reaches nearly or quite to the suture being however thinned out to a point 

 at its termination. The male characters seem to be almost the same as in Dytiscus 

 fimbriolatus, but the sexual distinctions in the female are less, the head behind 

 the eyes and the sides of the thorax bear fine scratches, but the elytra appear quite 

 smooth, on careful examination however there are found a few very fine short 

 scratches placed on the basal portion of the yellow lateral band ; the sexual flatten- 

 ing and obliquity of the epipleurae is also less than in Dytiscus fimbriolatus. 



Mexico, (Corafalce, Madame SaUe) ; Texas (coll. Castlenau sub nom. 0. pilati, Dup.) 1052. 



