318 On Aquatic Carimvorous Coleoptera or Dytiscide. 
[Stigmata of last two) 
| dorsal segments not, 
or but little, broader | 
| than the preceding 
i ones; outline of eye 
notched by the free 
margin of front of 
head. J 
COLY MBETIDES. 
(Vide p. 490.) 
Hind niargins of 
joints of pos- 
nea es Stigmata of last two) 
dorsal segments en- 
tened and ad- 
—secraal GRID larged, each on the 
P : penultimate — seg- 
( 
| 
| 
| 
| 
| 
Inferior spur of 
hind tibia not, 
| 
| 
| 
| 
| 
| 
Prosternal pro-| or but little, | ment being about Dytiscini. 
cess on same! broader than | one-fourth of total (Vide p. 632.) 
plane of di-| the other. | breadth of the seg- 
rection asthe } | ; ment; circular out- 
prosternum ; | | line of eye uninter- | 
front tarsi 5- rupted. J 
jointed. | | 
| Hind margins of) 
| joints of pos- 
| | terior tarsi 
provided ex-} -— HYDATICIDES. 
| | ternally with (Vide p. 647.) 
| | flattened — ad- 
! | pressed ciliz. | 
ee spur of) 
| hind tibia di-! 
| lated, much \ — = CYBISTRINI. 
: | broader than | (Vide p. 700.) 
L 
the other. J 
J. 16.—Genus AMPHIZOA. 
Antennze with the seven or eight basal joints more or less distinctly punctate, 
the others glabrous and shining. Hind coxe connected to the metasternum by a 
nearly straight transverse suture ; metasternum marked in the middle behind by 
an indistinct transverse suture. 
The three rare species are found in the western parts of North America. 
176. Amphizoa insolens, Leconte, M.C. Tom. I.—Nigro-picea, sine pubescentia, 
opaca, rugulosa ; thorace elytris multo angustiore, lateribus serrulatis, pone medium 
sinuatis, angulis posterioribus acutis, medio longitudinaliter canaliculato ; elytris 
punctato-rugulosis, sat distincte striatis; prosterni processu brevi, lato. Long. 
113, lat 6 m.m. 
North America (California). 232. 
177. Amphizoa josephi, Matthews, Cist. Ent. I, p. 119.—Nigricans, sine 
pubescentia, opaca, subdepressa; thorace elytris multo angustiore, lateribus 
