On Aquatic Carnivorous Coleoptera or Dytiscide. 301 
and the Canary Islands, (L. inflatus, 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 Aubé, (L. testaceus). 
Europe (Corsica and Sardinia), Algeria, Canary Islands ; extends in the north as far as Lapland, 961. 
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 preesertim posterius 
confluentibus, ad basin, ad latera et ad apicem areis esignatis; antennis palpisque 
apicibus angustius fuscis; prothorace basi in medio breviter producto. Long. 43, 
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 te 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 23 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 antenn 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 Lapland in the north. 562. 
131. Laccophilus difficilis, 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. 42, lat. 23 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 
2R2 
