On Aquatic Carnivorous Coleoptcra or Di/tiscidce. 291 



The markings in this species are similar in their general character to those of 

 Dytiscus maculosus (No. 92), but are more indistinct, and there is a large dark mark 

 before the extremity while the apex is entirely pale and unspotted : in the male there 

 can be generally distinguished obscure basal marks, somewhat as in D. maculosus, 

 in the female these are even more indistinct. The sexual characters are much 

 those of D. maculosus ; the coxal file in the male is rather coarse, and is quite 

 distinguishable in the female. 



o 



North America; Philadelphia; (Georgia, Indian Territory, Califoi-nia, fide Crotch). 534. 



99. Laccophilus apicalis, Sharp, Ent. Mo. Mag. x, p. 53. — Ovalis, satconvexus et 

 nitidus, testaceus, elytris nigro-suftusis, versus apicem late nigris, apice pallido, 

 lateribus basique testaceo-signatis ; pectore utrinque parum obscuriore. Long, vix 

 5, lat. vix 3 m.m. 



This species is very closely allied to Laccophilus fasciatus, but is broader and 

 more convex, and the dark colouration of the elytra has a greater extension; the 

 base of the thorax is more produced in the middle : the male characters are much 

 the same in the two species, the tarsi being much incrassate and the coxal file 

 coarse ; in the female I am scarcely able to see any traces of the file. 



Central America; Nicaragua, Chontales; Guatemala, S. Geronimo, Champion. 535. 



100. Laccophilus salvini, n. sp. — Ovalis, sat convexus et nitidus, testaceus, 

 elytris nigro-sufl:usis, versus apicem nigris, apice pallido, lateribus basique testaceo- 

 signatis; pectore abdomineque nigricantibus. Long. 4^, lat. 2| m.m. 



Closely allied to Laccophilus fasciatus, rather narrower and more convex, and 

 with the under surface darker ; the front portions of the elytra are darker, so that 

 the transverse black band is less distinctly defined in front ; the thorax in the 

 middle of the base forms a slightly more acute angle. The male has the coxal file 

 much finer than it is in the same sex of L. fasciatus ; in the female it appears to be 

 entirely absent. 



The species is quite distinct from L. apicalis, by the darker colour, by the smaller 

 size, by the finer coxal file ; none of the individuals have any trace of pale longi- 

 tudinal marks on the basal pai-t of the wing-cases, and the apical pale spot is smaller 

 than in L. apicalis. A variety occurs in which the hind legs are pitchy in colour. 



Guatemala. (Found by Osbert Salvin, Esq., at an elevation of 5,000 feet ; Guatemala city, Duenas, and 

 S. Geronimo, Champion). 536. 



101. Laccophilus americanus, Aube, Spec. p. 422. — Ovalis, sat latus, minus 

 convexus, nitidus, testaceus, elytris impunctatis, fusco-irroratis, maculis irregu- 

 laribus ad margines magis conspicuis testaceis. Long. 4i, lat. 2i m.m. 



TBANS. EOT. DUB. SOC, N.S , VOL. U. 2 Q 



