19 
HALIPLID A. 
G. R. CrotcH.—Revision of the Dytiscide of the United States. 
<Trans. Amer. Entom. Soc., Vol. LV, 1872~73; Haliplides, pp. 
383-385. 
DYTISCID &. 
G. R. CrotcH.—[ Work just cited; Dytiscides, pp. 385-424. | 
DAvip SHARP.—On aquatic carnivorous Coleoptera or Dytiscide. 
<Trans. Royal Dublin Soc., 1882, Ser. 2, Vol. II, pp. 179-1003, 
plates. 
A monograph of the Dytiscidz of the whole worid. 
GYRINID A. 
JOHN L. LE ContE.—The Gyrinide of America, north of Mexico. 
<Proc. Ac. Nat, Se. Phil., 1868, pp. 365-373. 
M. ReEGIMBART.—Essai monographique de la famille des Gyrinides. 
<Ann. Soe. Ent. de France, 1882-83, with eight plates. 
Treats of the Gyrinide of the whole globe. 
HYDROPHILID A. 
JOHN L. LE ConTE.—Synopsis of the Hydrophilide of the United 
States. <Proc. Acad. Se. Phil., Vol. VII, 1855, pp. 356-375. 
GEORGE H. HorN.—Revision of the genera and species of the tribe 
drobiini. <Proc. Amer. Philos. Soc., 1873, pp. 118-137. 
SILPHID A. 
JOHN L. LE ContE.—Synopsis of the Silphales of America, north of 
Mexico. <Proc. Ac. Nat. Sc. Phila., Vol. VI, 1853, pp. 274-287. 
GEORGE H. HORN.—-Synopsis of the Silphide of the United States, 
with reference to the genera of other countries. <Trans. Amer. 
Entom. Soce., Vol. VIII, 1880, pp. 219-322, Pl. V-VII. 
SCYDM AINID ZA. 
JOHN L. LE CONTE.—Synopsis of the Scydmeenidz of the United States. 
<Proe. Ac. Nat. Se. Phila., Vol. VI, 1854, pp. 149-157. 
PSELAPHID As, 
JOHN L. LE ConTE.—On the Pselaphide of the United States. <Bos- 
ton Journ. Nat. Hist., Vol. VI, 1850, pp. 64 110. 
EM1L BRENDEL.—Synopsis of the genera and species of the family Pse- 
laphide. <Proc. Ent. Soc. Phil., Vol. VI, 1866-7, pp. 31-38. 
