84 
—— 
Tare III. Brecon 
This tribe is at once di from the Carabici, 
by the superior length of Oo hinder lage, wid are 
I. OTT Labial weed eternal vipa Sass og tow Am hese 
A. All the tarsi with five joints, last of which is 
47. Dette Gres XLVII, Dytrevs. Geoff. Tig. Latr. 
_ Dyrtiscus. Linn, Fabr, Oliv. Lam. 
Scutellum distinct ; anterior tarsi of the male patelli- 
pl el of the female sulcated ; external maxillary 
the last two joints equal. 
Marginalis. 1. Marginalis. Ovate, olive-black above; lu- 
Bp he he of the same colour 
with the elytra ; whole of’ the thorax, 
ad bender of the red clay-colour ; bifarcatur of 
the sternum lanceolate. 
Inhabits E 
Linnaus considered the sexes of this insect as dis- 
tinct species, under the names Dytiscus semistriatus 
and marginalis. 
Dyliscus circumflexus of Fabricius, the ellatus 
of Latreille, is very abundant near London. It is diss 
tinguished from marginalis by its more elongate shape, 
byte bifurcate Bo igen of the sternum being spine- 
oat and na by th e colour of the scutellum, which is in- 
“ENTOMOLOGY. 
Genus LIL. Hyenyprvs. eniggeapevtiae 74h 
Hypracuna. og ed ‘ 
Dyrtiscus. Linn. Marsh 
‘  aaaly givhaan ib -<tiligha einebing te _ 
Sp. 1. F acaie ctigtbas, teat Fou 
tate ; the base of the elytra ene hea 
base of the suture. ~ 
iscus ovatus. Linn. 
' 5%. Hy- 
 Paypaus, 
= tatoo! Sed a . 
drus ineus. tr. y 
inka ee ooh a eli 9 
ci differs from from the “the abe Laatvata a more 
shining colour, in si hyieetasio distinct~ 
ly and widely p not the above be but | 
sexual distinctions? Such is the opinion of Dr Leach, | 
who-could never find the sexes of each Kind. 
pote aa with a scutellum. 
48. CoLYM- bar in XLVIII. Corymerres. | ‘Clairville. - Genus LIII. Pxuontus. Schénher, Leach, 53. Pate. 
wETED. Dytiscus. Linn, Fabr. Gyll. ‘Hycrosia. Clairville. BIUS, 
Dyrticus. Latreille. Hyrnyprvs. Latreille. 
Scutellum distinct ; anterior tarsi of the male dilated, Dyrtiscus. - Marsham. wih 
but not patelliform ; ‘d of the female not sulcated ; Hypracuna. Fabricius. _ 
exterior maxillary palpi with the last joint longer than ‘canines fst ao ews Sots Nerdiges sti WiicRter Pha 
the one before it. the rest. 
Bupustula- “Sp. 1. Bupustulatus. Oval, depressed, black ; finel Sp. 1. Hermanni. Black ; head, transverse band on Hermanni. 
tus, striated above the elytra with impressed poitits, whi the thorax; base and border of the elytra and feet 
are obsolete ; antenne labrum, two frontal spots; an- ferruginous. 
terior tibiae and tarsi obscure red ; i gray. a! Hermanni.. Marsh. Oliv. 
Dytiscus bipustulatus. Linn. Fab | Hepliras Hermanni. Fabricius, . 
Dyticus bipustulatus. Late. gro Hermanni. Latr. Gen. Crust. a Ins. 
liscus carbonarius. Il. 
Inhabits the European waters every where.  Takabite the marshes of France and Jand. The 
9. Lacco- Genus XLIX. Laccopuius. last segments of the abdomen, when against the 
PHILUS. Dytiscus. Linn. Marsh. G ped a hres a noise. 
Scutellum, none. Antenne, setataceous. Palpi, fili- I]. External maxillary and labial i subulate ; 
form, hinder thighs covered at their base with a shield- 7 
Minutus. Sp. 1. Minutus. Greenish-testaceous ; legs yellow- — plate. 
ish. enus LIV. Hauiretus. [Latreille. 54. Hati- 
iscus Minutus. Linn. Marsh. ‘Gyll. Hopuitus. Clairville. PLUS. 
Laccophilus Minutus. Leach. Cyremipotus.  Illiger. 
Inhabits it waters. Dytiscus. Geoffroy, Marsham. 
50. NoTE- sat L. ciel oy, . Latr. pore grs , hone ; - oval, co oniiradieibir ie 
RUS. tTiscus. Fabr. Mars 7 8 ish or’ . Impressus, 
Dyticus. Latr. with some lete abbreviated punctured strie, and 
Scutellum, none. Antenna, with a fifth or seventh ‘with blackish lines'and spots. 
joint dilated. Labial palpi, bifurcate. Inhabits France, England and Germany. 
Crassicor- Sp. 1. Crassicornis. Oval, convex, brown; ‘head ye Re Ey, . 
nis. and thorax ferruginous ; elytra ed with impress- f 
ed dots ; antenne of the male thick. - Internal palpi com’ compoced of a An- 
Dytiscus crassicornis. Fabr. Oliv. tenne very short. Eyes divides soas to 
Dylicus crassicornis. Latr. Four hinder feet compressed, fSobiaceteen Reeiasil for 
Germany and France. Thorax in each sex, swimming. 
with margined sides, with an impressed longitudinal Genus LV. Gyninus. Linn. Fabr. Latr. Gyll. 55. Gyrt- 
line, Sp. 1. Natator. Oval ; elytra with punctured strice ; pe 
B. The four anterior tarsi, with four’ joints ; > ries Nace op — 
scutellum, rinus Natator. Gyll. 
51. Hy- 
DROPORUS. 
Genus LI, Hyproporvs. Clairville. 
its stagnant waters. 
