336 REPORT ON /OOLOGY, MDCCCXL1V. 



ulatus, Mull. 11. pundatus, St. Ilydnena. 1. testaceu, Curt. 2. rugosa, 

 new species, from Paris. 3. nigrita, Mull. 4. riparia, Kug. 5. anyus- 

 tata, Dej. 6. gracilis, Mull. 7. flavipes, St. C. Hydroplnliem : upper 

 lip discovered ; corslet as broad behind as the shards, a. Limnobiaires : 

 abdomen with six to seven ventral segments. Limnebius. 1. truncatelliis, 

 Thuub. 2. papposus (mollis, Marsh. ?) 3. nitidus, Marsh. 4. atom/is, 

 Dft. (minutissimus, Germ.) /3. Berosaires : ventral segments five; middle 

 shanks fringed for swimming. Berosus.\. spinosus, Stev. 2. (ericeps, Curt. 

 3. Ittridus, L. 4. affinis, Brulle. y. Hydrophilaires : ventral segments five ; 

 middle shanks without hairs for swimming ; breast keeled. Hydrophiluspiceus. 

 Ilydrous. 1. caraboides, L. 2. flaoipes, Stev. S. Hi/drobiaires : ventral 

 segments five; middle shanks without hairs for swimming; breast simple. 

 t Hydrobiates : jaw-palps shorter than the feelers. Hydrobius. \.convexns, 

 111. 2. oblong us, Hbst. 3. fuscipes, L. 4. bicolor, Pk. 5. (pnews, Stev. 

 6. fflobulus, Pk., (limbatus, F.,) JJ Laccobius minutus L. ff Philydrates : jaw- 

 palps longer than the feelers. HelocJiares (at first Helop/iilus, subsequently 

 changed with propriety, on account of the genus of Diptera so named). 1. 

 lioid/ts, Forst. 2. melanoplitlialmus, Duf., from Spain (previously described 

 by Erichson as Hydrobius liicidm, from Angola). PhUydrus. 1. melano- 

 ceplialus, Oliv. 2. margincllus, F. E. Cyllidiaires : but four ventral seg- 

 ments visible : CyUidium seminulum, Pk. 



B. Geophilides : first joint of the hind feet longer than the second : Splu?- 

 ridiem. a. Splia>ridiaires : mid-breastplate (rnesosteruum) much narrower 

 than it is long. Cydonotum orbiculare, F. Sphceridium. 1. scambteoides, L. 

 2. bipustulatum, with which the author joins Sph. marginutmn, F., without 

 good grounds in my opinion. Cercyon. 1. obsoleium, Gyll. 2. hcemorrlwidale , 

 F. 3. Juemorrliowm., Gyll. 4. laterals, Steph. 5. unipunctatum^. 6. 7s- 

 qnilimn, L. (he confirms the doubt which I have suggested respecting the 

 generally received assumption that this is but the $ of the last species ; 

 both sexes of each occur). 7. centrimaculatum, Sturm. 8. pygmceum, El. 

 9. litorale, Gyll. 10. aquaticitm, Steph. 11. favipes, F. 12. mela- 

 nocephalum, L. 13. minutum, F. 14. lugiibre, Pk. 15. <*;*#/<?, Pk. 

 Pelosoma, new genus, distinguished from Cercyou by the form of the mid- 

 breastplate, which is neither linear nor fusiform, but elongate pentagonal. 

 P. lafertei, new species from the district of Chinon. (3. Ncgasternaires : 

 mid-breastplate broader than long. Two new genera, the first with rhom- 

 boidal, the second with pentagonal, fore-breastplate : Ncgasternwn boUtoplia- 

 gum, Marsh. ; Cryptopleiirum atomarium, F. 



The last three genera, and with them the last group, appear to me to be 

 divided from Cercyon artificially. 



Mulsant (Ann. Scicnc. Phys. Nat. Lyon vii, p. 167) has illustrated the 

 genus Cydonotum in a Monograph, derived chiefly from the species of 



