COLEOPTERA. ELATERIDZ. 25 
PTOSIMA Serville. Acritus p. Esch. 2sp.  Bupr. 9-maculata Linn. ~ 
Scutel distinct, rounded; thorax truncate at the base; mentum with a long 
central tooth. Pz. 68. 17. 
AGRILUS Megerle. Agritus A. Steph. 4sp. Bupr. viridis Linn. Curt. pl.67. 
Scutel distinct, triangular ; thorax sinuated at base; tarsi with pulvilli beneath 
the four basal joints; tarsal claws toothed. ; 
APHANISTICUS Latr. Burrestis p. Fab. 1 sp. Aph. pusillus Gyll. 
Middle legs wide apart; body linear; head notched; antennz with the four 
terminal joints dilated. Curt. 262. 
TRACHYS Fab. Burrestis Don. 3 sp. Bupr. minuta Linn. Donov. 8. 256. 
Short, broad; antenne free, serrated towards the tips; scutel wanting; thorax 
posteriorly trilobed. 
Family 2. HUCNEMID Westw. 
Subfamily 1. Hucnemides Latreille. 
MELASIS Oltv. Exarer p. Linn. 1sp. El. buprestoides Linn. Curt. 55. 
Antenne distant at base, flabellate in the g; body cylindric; legs flattened. 
MICRORHAGUS Esch, Evucnemis Steph. 1 sp. Euc. pygmeus Mann. 
Body narrow, depressed ; antennz quite close together at the base; antenne J 
ramose; legs slender. Mann. Eue. pl. 2. f. 4, 5, 6. 
Subfamily 2. Cerophytides Latreille. 
CEROPHYTUM Latr. Crrarornytum Lea. 1 sp. _ Cer. elateroides Latr. 
Body ovoid; antennx g strongly pectinated ; tarsal fourth joint bilobed. Guérin, 
Icon. Ins. pl. 12. f. 6. 
THROSCUS Laér. Trixacus Gyll. 2 sp. Elat. dermestoides Linn. Curt.163. 
Elliptic, depresssed ; antenna terminated by a 3-jointed perfoliated club; palpi 
clavate ; fourth tarsal joint triangular. 
Family 3. ELATERID Leach. (Elater Linn.) 
ADRASTUS Esch. Cararuacus A. p. Steph. 2sp. El. limbatus Fab. 
Plates at the base of the hind legs gradually dilated within; the sides of the 
thorax acutely marginate in the middle; body nearly linear ; ungues denticu- 
lated. Herbst. Col. pl. 165. f. 11. 
DALOPIUS Esch. Carvarnacus A. p. Steph. 1 sp. El. marginatus Linn. 
Basal plates abruptly dilated within; sides of thorax acutely margined in the 
middle; antenne serrate; body more robust. Oliv. 31. pl. 8. f. 83. 
AGRIOTES Esch. Cataruacus A. Steph. 4 sp. El. sputator Linn. 
Antenne submoniliform, second joint long; sides of thorax not acutely margined 
in the middle; forehead and thorax very conyex ; body oblong. Pz. 93, 13. 
SERICOSOMUS Serv. Srricus Esch. 4 sp. El. brunneus Linn. 
Antenne short, serrate, second and third joints short; basal plates broad, equal; 
body more or less cylindric ; thorax short, conyex. Herbst. 112. 27. b. 
ECTINUS Esch. Enarer A. a. p. Steph. 1 sp. El. aterrimus* Linn. 
Antenne elongate ; basal plates rather broader within ; body very convex ; fourth 

* Eschscholtz gives the Elater aterrimus Fab. as the type of his Ectinus, but 
Dejean and Latreille place the Aterrimus Linn. in this genus, giving the former 
insect, which is distinct, and is the Niger of Linn., in the genus Athous. Mr, Ste- 
phens has also adopted this arrangement. 
