On Aquatic Carnivorous Colcoptera or Diji.i.scidce. 301 



and the Canary Islands, (L. iaflatus, Woll.) The species also varies in breadth and 

 size ; the larger and broader individuals are found only in the more southern parts 

 of its area of existence, and were considered a distinct species by Aube, (L. testaceus). 



Europe (Corsica and Sardinia), Algeria, Canary Islands ; extends in the north as far as Lapland. 5G1, 



Group 4. 



129. Laccophilus lewisius, Sharp, Tr. Ent. Soc. Lond., 1873, p. 52. — Ovalis, sat 

 latus, minus convexus, nitidus, prothorace anterius in medio et in basi brevissime 

 nigricante, elytris longitudinaliter fusco signatis, signaturis prgesertim posterius 

 contluentibus, ad basin, ad latera et ad apicem areis esignatis ; antennis palpisque 

 apicibus angustius fuscis ; prothorace basi in medio breviter producto. Long. 4|, 

 lat. 2| m.m. 



In this species the reticulation of the upper surface is quite distinct ; the male 

 has the front and middle tarsi much incrassate, and the last ventral segment more 

 truncate than in the female. The markings of the elytra give this very distinct 

 species a resemblance to Dytiscus maculosus, Germ. (No. 92), but Laccophilus 

 lewisius is smaller and has no trace of a coxal file. 



Japan. 616. 



130. Dytiscus obscurus, Panz. Laccophilus hyalinus, M. C. — Ovalis, sat angustus, 

 minus convexus, nitidus, testaceus, antennis palpisque apicibus infuscatis ; elytris 

 aliquando fusco-variegatis ; prothorace basi in medio minus breviter producto. 

 Long. 4, lat 2| m.m. 



The male has the front and middle tarsi much incrassate. There is no trace of 

 a coxal file in either sex. The species varies as to colour ; the elytra sometimes 

 being infuscate in such a way as to leave a rather complicated set of pale marks. 

 The species may always be at once distinguished from Dytiscus interruptus (No. 128), 

 by the absence of the coxal file, and by the thicker male tarsi, as well as by its 

 narrower form, more acute angle at the base of the thorax in the middle, and the 

 infuscate apices of antennte and palpi. The apical ventral segment of the male is 

 not truncate, and its form differs only very slightly from that of the female. 



Europe, (Corsica and Sardinia), Algeria and Syria; extends as far as Laiiland in the north. 5G2. 



131. Laccophilus diflficilis. Sharp, Tr. Ent. Soc. Lond. 1873, p. 53. -Ovalis, sat 

 latus, minus convexus, nitidus, testaceus, antennis palpisque apicibus infuscatis ; 

 prothorace basi in medio minus breviter producto. Long. 4i, lat. 2i m.m. 



The male has the front and middle tarsi much incrassate. The species differs from 

 the preceding, by its form, which is broader in the middle, and so appears more 



2 R 2 



