HYDROPHILIDil^:. 
Ins, 35 
this darkening appears to have some connection with the black colour of 
the insect itself. The appearances induced by various reagents are 
described. 
Bedel, Bull. Soc. Ent. Fr. (6) i. pp. xciv. & xcv., remarks on species 
described by Brull^, Hydrnphilus ensifer and ovalis, B,, = ater, Oliv. ; 
H. medius and irinus, B., belong to HydrocTiaris ; Tropisternus dorsalis 
and lepidus, B., = sellatus and scutellaris, Cast., respectively ; Philhydrus 
pallipeSy gihhiis, and fejnoratus^ B., belong to llelochares ; F. striatus, B., 
belongs to Helopeltis, Horn ; Trichopoda cassidiformis, B., belongs to 
Dactylosternum. 
Hydrcena pallidipennis, Cast., = Ochthebius marinus, Payk., var.; Em- 
pleurus opalisans, Motsch., Helophorus acutipalpus, Muls., and subcos- 
tatus, KoL, = H. micans, Fald. ; Hydrmna striata, Cast., is an Ochthebius ; 
Hydrobius artensis, Montr., is a Sternolophus ; Laccobius atrocephalus, 
Reitt., and nigriceps, Thoms., = sinuatus, Motsch. ; L. Jciesenwetteri, 
Reitt., == Anacoina bipustulata. Marsh. ; id, 1. c. pp. Ixxxvi. & Ixxxvii. 
Ilydrophilus piceus and Hydrobius fuscipes, egg-cases redescribed ; 
Laker, Ent. xiv. pp. 82-84. 
Hydrophilus setiger, Germ., = Tropisternus glaber, Herbst ; Berg, 
S. E. Z. xlii. p. 63, and Exped. Rio Negro, Zool. p. 98. H. triangularis, 
Say, egg-case and larva, especially the tracheal system of the latter, 
described ; Garman, Am. Nat. xv. pp. GGO-663, figs. : transformations 
described and figured; Riley, op.cit. pp. 814-817, figs. 
Hydrobius sahariensis, Fairmaire, noticed by him ; R. Z. (3) vii. p. 179. 
Limnoxenus grandis, Motsch., = Hydrobius convexus, Brull4 ; Bedel, 
I. c. p. cii. 
Anaccena, Thoms., = Greniphilus, Motsch. ; Des Gozis, Bull. Soc. Ent. 
Fr. (6) i. p. cxxxv. 
Philhydrus agrigentinus, Rottenb., noticed and figured by Ragusa, Nat. 
Sicil. i. p. G, pi. i. fig. 4, from Sicily. 
Limnebius atomus, Gerh., nec Duftschm., renamed aluta, Bedel, Fauno 
Col. Seine, i. p. 315. 
Helophorus borealis, Sahib, {pallid \pennis, Thoms.), — pallidus,Q(AA, ; 
H. elegans,'^d\\., ? = micans, Fald. {subcostatus, Kol. ; id. Bull. Soc. Ent. 
Fr. (G) i. p. cii, H. griseus, Er. {nec Herbst), = granularis, Thoms, {nec 
Linn.), renamed H. brevipalpis ; id. Faune Col. Seine, i. p. 301. 
Ochthebius numidicus, Reit., redescribed by Fairmaire ; R. Z. (3) vii. 
p. 182. 
Sphceridium. Notes on 6 Fabrician species ; Bedel and Waterhouse, 
Bull. Soc. Ent. Fr. (6) i. p. Ixxxi. S. dytiscoides, F., is a Dactylosternum ; 
S. atomarium, F. {nec Linn.), probably = Cercyon impressus, Sturm ; 
S. hcemorrhoidalis, F., = Cercyon Jlavipes, auct. ; but S. hcemorrhoidalis, 
auct. rec., = impressus, Sturm ; S. quadripustulatum, F., is a Scaphidium ; 
S. fimetarium, F., is a Phalacrus, and S. minutum, Fabr., is a Crypto- 
pleurum ; Cercyon minutus, auct., must now take the name of tristis, 111. 
Sphceridium melanum. Germ., = Hydrobius gibbosus. Say ; S. melan- 
opterum, Monir. ? — Dactylosternum dytiscoides, Fabr.; Cercyon ovillum, 
Motsch., = melanocephalus, Linn. ; G. posticatus, Mannerh., is a Mega- 
