II Y D 
tirely olive or dull green, fmooth, glabrous; antenna: 
and thighs piceous; (pine on the fternum nearly as long, 
as the body. Inhabits Coromandel. 
3. Hydrophilus atratus : black; (hells ftriate rounded,; 
fternum fpinous behind. Body gloffy-black ; (hells ftriate', 
punftured ; club of the antenrtas ferruginous. Inhabits 
South America ; fize-of H. olivaceus. 
4. Hydrophilus caraboides : black, poliftied ; fliells fub- 
ftriate. Inhabits Europe. 
5. Hydrophilus lateralis : gloffy-black ; edges of the 
thorax and fliells yellow. Sternum projecting backwards 
into a (harp point, with a yellow dot in the middle ; legs 
ferruginous. Inhabits South America ; half the fize of 
the laft. _ _ . 
6. Hydrophilus rufipes: (liining black; legs rufous, 
fternum with a recurved fpine. Antennse ferruginous, 
the club brown ; body glabrous, immaculate. Inhabits 
China; half the fize of H. caraboides. 
7. Hydrophilus emarginatus: dufky-brown ; (liicld emar- 
ginate. Body gibbous, opake ; (liield widely emarginate. 
Inhabits Europe; adheres to aquatic plants. 
8. Hydrophilus fcaraboides : black ; (hells ftriate ; legs 
piceous. Inhabits Europe. 
9. Hydrophilus picipes: black; legs piceous; (hells 
fmooth. Body fmooth, glabrous. Inhabits Germany. 
10. Hydrophilus orbicularis: roundifh ; body glabrous, 
black. Quite fmooth, and (liining. Inhabits Germany. 
11. Hydrophilus fubrotundus: roundifh; glabrous, 
black; (hells ftriate, Inhabits America; a little lefs than 
the laft. 
12. Hydrophilus bicolor: ovate; above yellowilh, be¬ 
neath black. Fore-feelers longer than the antennae; legs 
yellow. Inhabits Denmark ; larger than H. collaris. 
13. Hydrophilus collaris : black; mouth, fides of the 
thorax, and a few abbreviated lines on the (hells, ferrugi¬ 
nous. Antennas and legs brown; edge of the (hells fer¬ 
ruginous; body gibbous. Inhabits South America. 
14. Hydrophilus undatus : ovate, black ; thorax pale ; 
fliells ftriate, grey. Head gloffy-black; antennas and feel¬ 
ers yellow ; thorax with a double black dorfal line; (hells 
obfcurely waved with black ; body black; legs yellow. 
Inhabits South America; rather larger than H. luridus. 
15. Hydrophilus erythrocephalus : ovate, black; head, 
thorax, and border of the fliells, rufous. Legs rufous ; 
thighs black. A little lefs than II. collaris. 
16. Hydrophilus haemorrhoidalis : black ; fliells ftriate, 
tipt with ferruginous; (hanks ferruginous. Inhabits 
Germany ; lefs and more oblong than H. orbicularis. 
17. Hydrophilus marginellus: gloffy-black; thorax and 
fliells edged with rufous. Shells fmooth ; legs black; 
tarfi ferruginous. Inhabits Germany; fize of the laft. 
18. Hydrophilus ftriatus : glofly-biack ; (hells ftriate, 
ferruginous at the bafe and tip. Head and thorax fmooth, 
immaculate ; legs fubferruginous. Inhabits Germany. 
19. Hydrophilus luridus : thorax brown ; (hells ftriate, 
and cinereous-brown ; body black. Inhabits Europe. 
20. Hydrophilus minutus: ovate, black; (hells and 
legs grey. Inhabits Europe ; makes a buzzing nolle to¬ 
wards night. 
21. Hydrophilus grifeus: above cin'ereous, beneath 
brown ; legs cinereous. Inhabits Saxony ; ftze of H. mi- 
nutus. 
22. Hydrophilus bipunclatus: thorax black, edged 
with grey ; (hells brown, with a wliitifh margin and dot 
behind. Head black, with a grey marginal dot each (ide ; 
dot on the'fliells fometimes hardly vifible. Inhabits Eu¬ 
rope ; (mall. 
23. Hydrophilus pygmreus: grey; head black behind ; 
thorax yellowilh. Shells fmooth, grey, immaculate ; body 
and legs darker. Inhabits South America ; very minute. 
24. Hydrophilus tricolor: body black; fliells piceous, 
"edged with black and ochraceous ; legs tawny. Inhabits 
Berlin. 
25. Hydrophilus cordiger: body black; (hells, and 
edge of the thorax red ; in the middle of the fnelis a black 
VOL. X. No. 691. 
H Y D 62 0 
heart-fhaped fpot; legs brown, and finely toothed. Inha¬ 
bits Berlin. 
26. Hydrophilus rufus: rufous ; fliells very fmooth, 
darker ; the outer edge whitifh, two-toothed before. In¬ 
habits Italy. 
27. Hydrophilus obfcurus: livid;- abdomen black; 
(hells gloffy, with crowded dots. Is properly no more than 
a variety of H. luridus. Inhabits Denmark. 
28. Hydrophilus puflllus : black; fliells very fmooth ; 
antennse and tarfi brown. Inhabits Denmark. 
29. Hydrophilus pilula : black; above poliftied with 
crowded dots. Inhabits Europe. 
30. Hydrophilus niger: gloffy-black; fliells finely ftriate, 
with diltant dots; antennse and ends of the legs ferrugi¬ 
nous. Inhabits Europe. 
31. Hydrophilus ater: black, glabrous; antennae and 
(hanks reddifti. Inhabits Europe. 
HYDROPHO'BIA, [from vowg, Gr. water, and <po€ev, 
to fear.] A, dread of water ; a lymptom of the difeafe 
caufed by the bite of a mad dog. The principal and ori¬ 
ginal feat leems to be about the ftomach, and parts con¬ 
tiguous to it. Dr. Seleg thinks that it is feated in the par 
vagum and intercoftal nerves ; for mod of the fymptoms 
happen where thefe nerves are interfperfed. When a dog 
is affeCted with madnefs, he becomes dull, folitary, and 
endeavours to hide himfelf, feldom barking, but making 
a murmuring noife, and refufing all kinds of meat and 
drink. He flies at ftrangers; but, in this ftage, he re¬ 
members and refpedts his mafter; his ears and head hang 
down ; he -walks as if overpowered with deep ; and a bite 
at this period, though dangerous, feldom conveys the dif¬ 
eafe. After thele fymptoms, the dog begins to pant; he 
breathes quick and heavy ; hangs out his tongue to dif- 
charge a great quantity of froth from his mouth, which he 
keeps perpetually open ; fometimes he walks (lowly, as if 
half afleep, and then fuddenly runs, but not always directly 
forward ; at length he forgets his mafter ; his eyes look 
difpirited, dull, full of tears, and red; his bark is hol¬ 
low and hoarfe; his tongue of a lead colour; he grows 
faint, thin, and weak, often falls down, again riles, at¬ 
tempts to fly at every thing, and foon grows furious ; 
this fecond ftage feldom continues thirty hours ; death by 
that time putting an end to the difeafe, and a bite received 
at this time is the mod: dangerous. For the effects of this 
dreadful malady on the human fubjeff, and the moft ap¬ 
proved methods of prevention and cure, fee the article 
Pathology, in this Encyclopaedia. 
HYDROPH'ORA, [ in botany, a genus of the clafs 
cryptogamia. order fungi. The generic chara&ers are— 
Fungus globular, watery; on a nearly-ered: capillary (tern. 
Species. 1. Hydrophora minima: colourlefs, item yel- 
lowifli. 
2. Hydrophora tenella: colourlefs, ftera grey. 
3. Hydrophora ftercorea: head and item dirty yellow'. 
HYDROPHO'RIA,y; in Grecian antiquity, a feftival 
in memory of thole who periihed in the deluge. 
HYDROPH'YLAX, f [from vfrwg, Gr. water, and Ot/Aaf, 
a keeper or guardian.] In botany, a genus of the clafs te- 
‘trandria, order monogynia, natural order of rubiacese, juff. 
The generic characters, are—Calyx: perianthium one- 
leafed, upright, four-parted,: fuperior, permanent; leg¬ 
men ts ovate, acute, margined, fqmewhat flefliy. Corolla : 
one-petalled, funnel-form ; tube longer than the calyx ; 
limb angular, four-cleft; fegmehts ovate, revolute ; throat 
bearded. Stamina : filaments four, placed on the tube, 
decurrent, upright, longer than the corolla ; antherse fub- 
haftate. Piflillum: germ oblong, inferior ; ftyle filiform, 
curved; ftigma bifid. Pericarpium : berry juicelefs, ovate, 
compreffed, with three ribs on each fide, the middle one 
higher, with an attenuated margin, a little bowed in, fun¬ 
gus two-celled ; with a tranfverfe partition. Seeds: foli¬ 
tary, oblong, bowed in a little, three-fided, two-grooved 
on the inner (ide, lbmewhai rugged.— EJfential Char after. 
Calyx four-parted ; corolla funnel-form ; fruit ancipital, 
om-feed eel. 
Hydrophylax. 
X 
