AKT. 3 NEW SPECIES OF WATER BEETLES OCHS 6 



ilar to those in G. natator nafator^ evident to the suture and not very 

 strongly impressed outwards. The convexity of body is very strong, 

 the pronotum is rehitively long and with only slight impressions. 



Type.— FQm^lQ (Cat. No. 41243, U.S.N.M.) from China, Szechuan, 

 Kuanshien August 19, 1924, 13,000 feet altitude (D. C. Graham), in 

 the United States National Museum. There is another female from 

 Szechuan between Chengtu and Kuanshien, July 2-5, 1924 (D. C. 

 Graham), which exhibits the same characters. 



GYRINUS RUGIFER, Regimbart 



Gyrinus ruffifcr Regimbart, 1883, Ann. Soo. Ent. France, ser. 6, vol. 3, 

 p. 179. — Fleutiaux and SallI-;, 1889, Ann. Soc. Ent. France, ser. 6, 

 vol. 9, p. 374.— RfioiMBABT, 1907, Ann. Soc. Ent. France, vol. 76, p. ISO.— 

 OcHS, 1924, Ainer. Mus. Nov., No. 125, p. 3. 



Specimens in the United States National Museum from Haiti, 

 Le Trou, September, 1925 (Hoffman). Hitherto only known from 

 Guadeloupe, Dominica, and Porto Rico. 



m GYRINUS COLOMBICUS Regimbart 



Gyrinus colomhicus Regimbart, 1883, Ann. Soc. Ent. France, ser. 6, vol. 3, 

 p. 180 ; 1907, Ann. Soc. Ent. France vol. 76, p. 178. 



Specimens from Bolivia, Limon, September, 1923 (Harrington), 

 in the United States National Museum agree very well with Regim- 

 bart's description. The species was mentioned by the describer 

 from Colombia and Venezuela. I have seen, besides the above men- 

 tioned, only a few specimens from Colombia (Coll. Sharp, in the 

 British Museum) and from Bogota (Coll, Klages, in the Carnegie 

 Museum), which can probably be referred to that species. 



GYREIES BOUCARDI Sharp 



Gyretes boucardi Sharp, 1882, Biol. Centr. Araer., Col., vol. 1, pt. 2, p. 51. — 

 REGIMBART, 1883, Ann. Soc. Ent. France, ser. 6, vol. 3, p. 407 ; 1907, Ann. 

 Soc. Ent. France, vol. 76, p. 188. 



In the females the hairless part of elytra is generally strongly 

 alutaceous, although polished specimens were mentioned by Regim- 

 bart in 1907,^ as variety dlmorphogynus. 



Of the latter I had only seen a single specimen from Guatemala 

 (from Coll. Donckier, Peschet leg., now in my collection). The 

 United States National Museum possesses another specimen of this 

 kind from Mexico, Tapachula, May, 1923 (W. M. Mann). 



These are very similar to Gyretes Tnexicanus Regimbart, but may 

 easily be distinguished by the exterior apical angle of elytra, which 

 is obtuse in meadcanus, angular in dimorphogynus ; moreover the 



» Add. Soc. Ent. France, vol. 76, p. 188. 



