On Aquatic Carnivorous Coleoptera or Dytiscide. 309 
152. Laccophilus posticus, Aubé. M.C.—Ovalis, sat latus et convexus, nitidus, 
rufo-testaceus, prothorace anterius et posterius in medio infuscato, elytris lineis 
undulatis, haud interruptis, confluentibus, nigris; abdomine pectoreque nigri- 
eantibus. Long. 4, lat. 25 m.m. 
This species is closely allied to Laccophilus complicatus, but is much smaller, 
and has the black marks on the elytra more confluent, and the breast darker. The 
male has the front and middle tarsi much inerassate; the structure of the last 
ventral segment so far as I can see in the very imperfect examples at my disposal 
is pretty similar in each sex to what it isin Laccophilus complicatus. 
Madagascar. 575. 
153. Laccophilus irroratus, Aubé. M.C.—-Ovalis, sat latus, subdepressus, 
pernitidus, rufo-testaceus, prothorace anterius et posterius longius infuscato, 
elytris lineis undulatis nigris; abdomine pectoreque nigricantibus. Long. 43, 
lat. 22 m.m. 
In this species the infuscation of the thorax is extensive so that the marks on the 
front margin nearly or quite connect. The black marks of the elytra are very 
waved, and cover it pretty equally, except that at the base they are more or less 
abbreviated, so as to give rise to a more or less distinct appearance of a pale fascia 
there. In the male the front and middle tarsi are but little incrassate, and the 
last ventral seement is truncate, but a little produced in the middle: in the female 
this segment has the middle part very broad, but it issinuate on each side, although 
the side angles are not produced. 
Mauritius. 576. 
154. Laccophilus medialis, n. sp.—Ovalis, subdepressus, pernitidus, testaceus, 
elytris in medio fascia lata. fusca et ad apicem parcius fusco-irroratis. Long. 32, 
lat. 2 m.m. 
In this species the dark marks of the elytra are so much abbreviated that there 
is a very broad pale fascia occupying the base, and only very slightly divided at 
the suture ; the apical portion of the elytra is broadly pale, but the dark marks again 
appear near the extremity in the form of some irregular irrorations. I have seen 
only the female, in which the sides of the last ventral segment have the appearance 
of being simply curved, owing to the middle part being very prominent, and sub- 
compressed laterally. 
Siam, (Bangkok). 577. 
155. Dytiscus variegatus, Germ. Laccophilus variegatus, M.C.—Ovalis, angus- 
tulus, minus convexus, nitidus, rufo-testaceus, prothorace anterius et posterius in 
QE See, 
