THE CANADIAN ENTOMOLOGIST. 339 



the genus and the group at large increases. They are Diplotiychus 

 columbice, Spinola ; D. putictatus, Stai, and D. rectus, Mayr, the two first 

 of which I am acquainted with in nature, and the latter by description. 

 They may be separated as follows : 



Key to the Species of Diplonychns, Laporte. 



1. (2) Anterior tarsi furnished with two claws oi equal 



length Ill, ?-ecius, Mayr. 



2. (i) Anterior tarsi furnished with two claws of ?(!//^^//(?/ length. 



3. (4) Disk of prothorax punctate, with two pronounced round fovese, 



hemelytra more or less punctate II, pundatus, St°ai. 



4. (3) Disk of prothorax slightly punctate, with two shallow foveae and two 



sulci converging posteriorly toward the transverse sulcus, 

 hemelytra impunctate I, columbice, Spinola. 



I. — Diplonychus coluinbice. Spin. 

 Hydrocyrms columbice. 



1850. — Spin, Mem. Nat. Soc. Modena, XXV, 146. 



1863.— Duf, Ess. Mon. Bel., Ann. Soc. Ent. Fr. (4), III, 385. 



1864. — Lucas, Ann. Soc. Ent. Fr. , IV., 2 28. 

 — Signoret, op. c, 224. 



1865. — Mayr, Reise der Novara, Hem., p. 183. 



187 1. — Ibid, Die Belostomiden, Verh. Zool.-bot. Ges. Wien, XXI, 

 439, part. 



1886.— Uhler, Ch. List, p. 28. 



1895.— Schmidt (Schwedt), S. B. Ges. Nat. Freunde Berlin, p. 38. 



1900. — Montandon, Bull. Soc. Sci. Nat. Buc. An. IX, No. 2 

 and 3, p. 4. 



1901. — Champion, Biol. Cent. Am., Het., II, 362. 

 Belostorna grande. 



1849 — Lucas, Hist. Nat. An. Art. Alg., Ill, 43. 



1862. — Ibid, Ann. Soc. Ent. Fr., II, 404. 



1864. — Ibid, op. c, IV, 227. 

 Ilyotrephes herculeus. 



1853.— Si°ai, Ofv. Vet. Ak. Forh., V, 264. 

 Hydrocyrius herculeus. 



j866.— Siki, Hem. Afr., Ill, 181. 

 Belostorna algeriense. 



1855. — Duf., Mem. Soc. Ac. Sci. Liege, X, 187, pi. I, f. 1. 



1862. — Lucas, Ann. Soc. Ent. Fr. II, 404. 



