Body large (about 4mm long), elongate oval. Coloration green to yellow green, with dark striations on dorsum, with a thin layer of clear wax. Without an ovisac, eggs laid underbody of female and hatch immediately after being produced. Occurring on the stems and leaves of the host.
This species was intercepted at U. S. ports-of-entry 8 times between 1995 and 2012, with specimens originating from Puerto Rico and U.S. Virgin Islands. No older quarantine specimens were examined. ScaleNet lists hosts in 14 plant families. It has been intercepted on a variety of plants. ScaleNet distribution records for P. howertoni include The United States of America (Florida) in the Nearctic zoogeographic region and Guatemala in the Neotropics. Phalacrococcus has only one valid species.