CHROMOSOME-NUMBERS OF SOME BRENTID AND CURCULIONID WEEVILS FROM PUERTO-RICO AND THE US VIRGIN-ISLANDS

Chromosomes of 24 curculionoid species from the Greater Puerto Rico Re gion, including the U.S. Virgin Islands are listed. Seven are endemic and eight are notable agricultural pests. The male meioformula of the broad-nosed weevils (Brachyderinae, Otiorhynchinae) as well as of the brentid Cylas formicarius elengantulus is the expected 10 + Xy(p), exc ept for the phyllobiine Lachnopus kofresi from Mona Island (16 + Xy(p) ). Representatives of the other curculionid subfamilies had higher aut osomal numbers and primitive sex bivalent, Xy(p).An exception was Anth onomus eugenii, which has a sex trivalent (X1X2Y) In the male. For mor phological and cytological reasons, Lachnopus coffeae montanus Marshal l, L. seini Wolcott, and L. yaucona Wolcott were synonymized with L. c offeae Marshall (NEW SYNONYMIES). One species of Ischionoplus (Brachyd erinae) is new to science and it is endemic for Mona Island.