14 ADEPHAGA. 
six coarse, short ruge. The form of the hind margin of the last ventral segment 
differs very little in the two sexes, it being distinctly but not greatly truncate, and 
projecting very little in the middle, so that there is scarcely any sinuation. 
17. Laccophilus championi. 
Ovalis, angustulus, convexus, pernitidus, politus, testaceus, prothorace antice et postice in medio elytrisque 
nigro-fuscis, his fascia lata subbasali, macula laterali in medio, fasciaque abbreviata postmediali testaceis ; 
prosterni processu apice elongato ; abdomine substrigoso. 
Long. 14, lat. 1 lin.) . 
Hab. Guatemana, Paso Antonio, 400 feet (Champion). 
The surface in this elegant little species is highly polished, and has no trace of 
reticulation; the basal fascia of the wing-cases is very conspicuous, and has its margins 
waved or angulate, it does not quite touch the suture on each side; the marginal pale 
spot is large and distinct ; the postmedial fascia is far from reaching the suture, and is 
more or less broken into spots. 
The individuals before me are all males. ‘The tarsi are only very slightly incrassate ; 
and there is a very obscure coxal file consisting of four or five short, coarse, but not deep 
ruge; the hind margin of the last ventral plate is but little truncate, and is scarcely 
sinuate at the side. 
18. Laccophilus ovatus. 
Laccophilus ovatus, Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 303. 
Hab. Guatema.a, Paso Antonio, 400 feet (Champion).—Brazit, Santa Cruz, Bahia. 
The Central-American specimens differ a little from the Brazilian individuals, 
inasmuch as they are a little smaller, and have no postmedial pale bund; but as the 
sexual characters seem to be quite the same; and as the pale bands in these species 
are evidently subject to a good deal of variation, it is probable that they are but 
one species. 
Series DYTISCI COMPLICATI. 
HYDROVATUS. 
Hydrovatus, Motsch. Et. Ent. 1855, p. 82; Sharp, Trans. Roy. Dubl. Soc. n. s. il. p. 848 (1882). 
Oxynoptilus, Schaum, Nat. Ins. Deutsch. i. 2, p. 28 (1868). 
This is an extensive genus of obscure species, well represented in most of the 
continental regions of the two hemispheres, though apparently South America is 
poorer in species than most other parts of the world; indeed both the Antilles and 
North America appear at present to have more species of the genus than has the 
whole of South America. 
