In recent years a great deal of research efforts in ship hydromechanics have been devoted to practical navigation problems in moving larger ships safely into existing harbors and inland waterways. An area of particular concern is the prediction of ship squat in shallow or restricted waters at different speeds. Squat may cause grounding of the ship which result in severe damage to the ship, and ...

The taxonomy of an invasive pest species, the Argentine ant, is reviewed. Linepithema humile (Mayr) 1868 is conÞrmed as the valid name for the Argentine ant.Morphological variation and speciesboundariesofL.humileareexamined,withemphasis onpopulations fromtheantÕs native range in southern South America. Diagnoses and illustrations are provided for male, queen, and worker castes.Collection record...