36 Ins. 
OOLEOPTERA. 
p. 6, pi. i. fig. 4. II. notula , var. similis described ; Ragusa, Nat. Sicil. i. 
p. 209, pi. xi. fig. 4. 
Rhantus latitans, Sharp, noticed as new to France ; Bedel, Bull. Soc. 
Ent. Fr. (6) ii. p. clxxiii. 
Colymbetes sobrinus, Motsch., = Agabus brevicollis , Lee. ; Schaufuss, 
Bull. Soc. Ent. Fr. (G) ii. p. clxxiii. 
Agabus fusco cenescens , R6gimb., redescribed ; Ragusa, l. c. pp. 227 
& 228. 
Cybister binotatus , Klug, and senegalensis, Aub6, noticed ; Ragusa, l. c. 
pp. 249 & 250. 
Dytiscus fasciventris , Say, found in a glass of water after a shower ; 
Murtfeldt, Am. Nat. xvi. p. 600. D. latissimus, Linn., variation noticed ; 
Dohrn, S. E. Z. xliii. pp. 470 & 471. D. marginalis : note on parasites ; 
Laker & Blake, Sci. Goss, xviii. pp. 46, 90, 91 & 208. D. punctulatus , 
var. maurus from Dresden noticed ; Schaufuss, l. c. p. clxxiii. 
New genera and species : — 
Notomicrus , Sharp, Tr. Dubl. Soc. (2) ii. pp. 261 & 833. Allied to 
Noterus ; anterior tibiae destitute of a curved spur, and with indefinite 
outer apical angle ; posterior coxal cavities but little separated, coxal 
notch scarcely visible. To include N. Icevigatus , pi. ix. fig. 107, p. 260, 
suturalis , Australia, brevicornis , Brazil, and traili , Tapajos, p. 261, spp. nn. ; 
add N. gracilipes and politus, Sharp, Biol. Centr. Am. Col. i. (2) p. 3, 
Guatemala. 
Pronoterus f id. Tr. Dubl. Soc. (2) ii. pp. 263 & 835. Allied to Noterus, 
front tibiae with acute outer apical angle ; curved spur small. Type, P. 
punctipennis , sp. n., 1. c. p. 263, pi. ii. fig. 109, Brazil. 
Synchortus, id. 1. c. pp. 264 & 835. Allied to Noterus , anterior tibiae 
with indefinite outer apical angle, with elongate curved spur, antennae 
slender, hind tibiae broad and flattened. To include S. simplex , acicu- 
latus , sparsus y Africa, and duplicatus , pi. ii. fig. 110, p. 264, spp. nn., and 
Hydrocanthus asperatus, Fairm., and rugoso-punctatus , Wehncke. 
Canthydrus, id. 1. c. pp. 269 & 838. Allied to Hydrocanthus, prosternal 
process only moderately broad, not broader than long; swimming legs 
rather slender. To include several species described by authors under 
Hydrocanthus , Suphis , &c. ; and C. sculpturatus , vicinus , p. 269, ovatus , 
grossus , rotundatus, Brazil, insularis, San Domingo, punctipennis , Carolina, 
p. 270, subsignatus, Panama, p. 271 ,dilutus, Bahia, rem[ig~\atory Uruguay, 
curtus, Amazons, p. 272, brevicornisy Parana, rvfipes, Cuba, Amazons, 
p. 273, centralis , Guatemala, grammicus , Amazons, concolor , ^Madagascar, 
p. 274, arabicus, Hedjaz, ornatus , Persia, p. 275, frontalis , Arabia, Bom- 
bay, sexpunctatuSy Tranquebar, p. 276, angularis, Singapore, p. 277, 
proximus , Siam, nitidulus, N. China, Formosa, and flammulatus , Siam, 
Celebes, p. 278, spp. nn. ; add C. simplex , pi. i. fig. 3, varians , Guatemala, 
p. 5, and majusculus , Panama, p. 6, spp. nn., id. Biol. Centr. Am. Col. 
i. (2). 
MacrovatelluSy id. Tr. Dubl. Soc. (2) ii. pp. 282 & 840. Allied to Vatel- 
lusy size moderate ; ventral sutures normal, mesosternum largely exposed 
between the prothorax and metasternum; outline of thorax and elytra 
