MERSHON EXPEDITION TO CHARITY ISLANDS. 83 



Tropisternus nimbatus Sa\'. One specimen found hy (Iredjiinfr 

 pond, July 17. One found swimming in a rock \)(H)\, on llic 

 northeast shore, July 17. 



Tropisternus mixtus Lee. Ten specimens taken by drcHlging 

 among roots of the water plants in the pond, July 17. 

 Tropisternus glaber Hbst. One specimen found swimming in 

 the rock pools, on the northeast shore, June 23. One in a rock 

 pool, July 17. 



Tropisternus sublaevis Lee. One specimen taken in a rock pool, 

 on the northeast shore, June 21. 



Hijdrocharis obtusatiis Say. Two specimens found in the water 

 of the ba}', near the northeast shore, June 21. Three crawUng 

 up from the Avater, July 16. One swimming in a rock pool, 

 July 17. 



Berosus striatus Say. One specimen found under a board on tlie 

 wet sand, on the northeast shore, June 24. 



Berosus infuscatus Lee. One specimen found on the wet rocks, 

 on the northeast shore, June 21. Two found in rock pools, 

 June 23. Four found in rock pools, July 17. 

 Cymbiodijta blanchardi Horn. Two specimens taken by dredging 

 the pond, July 17. 



Philhydrus bifidus Lee. Five specimens found in the rock pools, 

 on the northeast shore, June 23. Fifteen found in the rock pools, 

 on the northeast shore, July 17. 



Helochares maculicoUis Muls. Three specimens taken by dredg- 

 ing at edge of pond, July 17. 



Philhydrus ochraceus Mels. One specimen taken on wet rocks, 

 on the northeast shore, June 26. One found swimming in rock 

 pools, on the northeast shore, July 17. One found by dredging 

 the pond, July 17 



Philhydrus cinctus Say. One specimen found on a stone, on the 

 northeast beach, June 17. 



Philhydrus hamiltoni Horn. Four specimens taken by dredging 

 the mud of the small pond, near southwest shore, July 17. 



Hydrobius tessellatus Ziegl. Three specimens taken on the sand, 

 on the northeast shore, June 20. 



Hydrobius fuscipes Linn. Three specimens fouiul swinuning in 

 the rock pools, on the northeast beach, June 21. Seven found 

 in the rock pools, on the northeast beach, July 17. 



Creniphilus subcupreus Say. One specimen taken in rock pool, 

 on the northeast shore, June 26. ( )ne in pool on rocks, on north- 

 east shore, July 17. 



