82 SERRICORNIA. 
1. Margin of the front elevated behind the labrum ; 
size smaller. 
A. Prosternal spine truncate behind; scutellum 
cordiform ; larva with the abdominal segments 
widely separated by membranous divisions 
B. Prosternal spine acute; scutellum oval ; larva, 
as a rule, with the abdominal segments ap- 
proximate. 
a. Posterior angles of thorax spiniform; pro- 
sternum broad, with sutures single . . . 
b. Posterior angles of thorax produced, but not 
spiniform ; prosternum moderate, with su- 
tures double. 
a*, Prosternal sutures excavated in front; 
second joint of antenne shorter than third 
b*. Prosternal sutures not excavated in front. 
at. Antenne strongly serrate, with the 
second joint much shorter than third . 
b+. Antenne more feebly serrate, with the 
second joint about equal to third . . 
2. Margin of the front not elevated behind the 
labrum ; ; second and third joints of antenna very 
short . 
. Coxal pli ites gradually dilated inwards. 
"y Elytra without ventral epipleuree; eyes more or 
less sunk in thorax. 
A. Front not convex; mouth not inferior ;* an- 
tennz with the first joint not elongate. 
a. Claws serrate . 
b. Claws simple. 
a*. Tarsi with the first joint elongate . : 
b*, Tarsi with the first joint not or only 
slightly longer than second. 
a}. Thorax with posterior angles short, not 
overlapping the shoulders of elytra; 
anterior coxal cavities narrowly ape 
behind. . . a ey del i 
bt. Thorax with posteri ior r angles long, over- 
lapping the shoulders of elytra ; anterior 
coxal cavities broadly open behind 
B. Front convex; mouth inferior ; antenne with 
the first joint elongate, forming a scape. 
a. Claws pectinate. 
a*, Tarsi with the fourth joint strongly lobed 
beneath ; thorax longer; size much larger 
b*. Tarsi with the fourth joint not lobed; 
thorax shorter; size very small 
b, Claws simple. 
a*, Sides of thorax obtuse, margin deflexed 
in front; second joint of antenne longer 
than third Peer 
b*. Sides of thorax acute, margin straight i in 
front; second joint of antenne ; ae to 
third fs 
2. Elytra with the ventral epipleurse narrow but 
* In Sericosomus the mouth is deflexed and almost 
therefure be regarded as an exception. 
| Elateride. 
Carpiopnorws, Esch. 
CryYPTOHYPNUs, Esch, 
ELATER, L. 
IscHNoDES, Germ. 
MEGAPENTHES, Kies. 
Lupivs, Latr. 
Metanotus, Esch. 
Atnous, Esch. 
Limontivs, Esch. 
Sericosomus, Redé. 
Synaptus, Esch. 
ApRastus, Esch, 
Aariotrs, sch. 
Dotorius, Esch. 
inferior; the genus must 
