y -r\r**«"*« y$ 



Oblongus. Deprefled, black, polifhed: (hells ftriate: body oblong. 

 Inhabits Sweden under the bark of the roots of the afh tree. 



Abbrevia- Black ; (hells with crenate ftrise, the inner ones abbreviated. 

 &** Inhabits America : iize of H. pigmasus. 



Sinuatus. Black ; fhells with a (inuate rufous fpot in the middle. 

 Inhabits Germany. Oli<v.Infi i, 8. tab. i,fig. 5. 

 Shells ftriate on the inner edge, fmooth at the future. 



Cruciatns. Black ; (hells teftaceous with a common black crofs. 

 Inhabits Barbary ; iize of H. finuatus. 



Shells fmooth, polifhed, the future and fpot croffing it in the 

 middle black, hind margin black. 



*2-macula- B j ack . fa^ ftriate with a red fpQt behind# 



Inhabits Europe. Cliv. Inf. 1, 8. tab. 2. fig. 12, 



*$-macula- Black ; (hells with 2 red fpots on each. 

 tus - Inhabits Europe. Oli<v. Inf. 1, 8. t. 3, /. 15. 



*u€neus. BrafTy ; (hells ftriate at the bafe, punctured at the tip. 

 Inhabits Europe. Geoff. Inf. 1,8. tab. 2, fig. 10. 



Detritus. Black, mining ; (hells pitchy, du(ky at the tip. 

 Inhabits New Holland. Oli<v. Inf. 1,8. /. 2. f. 16. 

 Shells with 4 oblique ftriae at the bafe, the tip dulky and punctured , 



Oblong, black : (hells very (hort : antennas and legs pitchy. 

 Inhabits Germany. Oliv.Inf. 1,8. t. 2. fig. 14. 

 Shells abbreviated and not ftriate. 



Black ; thorax with a tranfverfe groove : antennae fer- 

 ruginous. 

 Inhabits Germany. Herbfi Arch. t. 36. /. 3. 



Apterus. Tawny; wings o. 



Inhabits Italy. Scopol. Ent. n. 3. 



9. GYRINUS. Antennae cylindrical : jaws 



horny, 1 -toothed, fharp-pointed: eyes 



4, 2 above and 2 beneath : thorax and 



Jhells margined, the latter (horter than 



the body ; legs formed for fwimming. 



Water-flea. 



Thcie 



