200 On Aquatic Carmcorcus Cohoptcra or Dyiiscidce. 



1 26. Laccophilus quadrivittatus, Aube., M.C.— Ovalis, minus latus, subde2:>ressus, 

 pernitidus, Isevigatus, rufo-testaceus, thorace anterius in medio et posterius, ulytris- 

 que summa basi iufuscatis, his fascia lata mediali nigro-fusca. Long. 3^, lat. 

 vix 2 m.m. 



In this species, the broad yellow apical portion of the elytra is more or less 

 infuscated across its middle portion, so as to give the appearance of a subapical 

 yellow fascia ; the male has the tarsi but little thickened ; in this sex the apical 

 ventral segment is rather more truncate than in the female, and appears slightly 

 sinuate-truncate on each side. The species is a very smooth and shining one, and 

 the oblique striae or scratches on the ventral segments are not conspicuous. 



Antilles, Porto Rico. 55 G. 



127. Laccophilus gentiUs, Lee, ]\I.C. — Ovalis, angustulus, subdepressus, nitidus, 

 rufo-testaceus, prothorace anterius in medio et posterius obscuriore, elytris sub- 

 tiliter punctulatis, fuscis, vage rufo-signatis. Long. 3^, lat. 1| m.m. 



In this species the markings are ill defined ; there is on the elytra a more or less 

 complete sub-basal pale band, and a spot on the middle of the side, and another 

 subapical one, the apex also being pale. The sculpture of the elytra though very 

 fine is distinct, and the scratches on the ventral segments are rather conspicuous. 

 The male has the front and middle tarsi rather thicker than in the female. There 

 is but slight sexual difference in the form of the apical ventral segment. 



A female specimen (from Cuba ?) in the collection of the Brussels Museum, is 

 rather larger and shows some other slight differences, so that it may prove to be 

 another species. 



Korth America, Louisiana. 557. 



• Group 3. 



128. Dytiscus interruptus, Panz. Laccophilus ininutus, M.C. — Ovalis, sat latus, 

 minus convexus, pernitidus, Irevigatus, testaceus, elytris plus minusve infuscatis, cum 

 sio-naturis testaceis plus minusve indistinctis ; prothorace basi in medio brevius 

 producto. Long. 45, lat. 2| m.m. 



In the male the front and middle tarsi are only very slightly incrassate ; the 

 apical ventral segment is rather more truncate in the male than it is in the female 

 and is very slightly sinuate on each side. There is a coxal file, composed of rather 

 numerous strife, which are separated by wide but only very slightly elevated spaces. 

 This file is about equally as distinct in the female as it is in the male. The species 

 varies in colour, and when the infuscation of the elytra is very slight the yellow 

 marks are of course less evident. The darker specimens come from Corsica, Sardinia, 



