BajaNomad

Have you seen this beetle?

bugdude - 12-7-2006 at 08:42 PM

Just keeping thread current as any records/specimens of rain beetles from Baja would be very significant toward my research.

After the first good soaking rain in the fall, male Pleocoma beetles make their appearance. Commonly called "rain beetles," Pleocoma (plee-oh-coma) typically are active during the winter season and are often seen flying just before, during or shortly after rainfall. The best time to collect Pleocoma is during early morning flights when males will be actively seeking the females. They will also fly at dusk and for a few evenings subsequent to rainfall. They are often attracted by porch lights or other sources of light at night/morning. Adult beetles are about 1-inch long (about the size of an olive), dark brown or black, and very hairy (see photos below). They are harmeless and do not sting or bite.

The Pleocoma family contains about 30 different species scattered throughout the wooded hills and mountains between northern Baja California (but probably occur farther south - hence my inquiry) and southern Washington. They live as grubs in the soil, surviving on roots of trees and shrubs, or in rotting plant material. They don't seem to cause a problem to the plants however, since they don't dig, but chew their way through the soil.

The best chance to see them is at night or early morning during or after any significant rains. If you find one, would you please put it any suitable container with some dry tissue paper and keep it in the refrigerator (or a cool place). They do not need to be kept alive. Specimens are needed for scientific studies.

An "ancient" record (1940s) in the literature is from Alamos, BC.

Muchas gracias.

pleo99.JPG - 27kB

BajaWarrior - 12-7-2006 at 08:51 PM

Bugdude, we're heading back down on the 15th till Xmas, then back again till New Years, there hasn't been any rain, but we'll keep an eye out for them in the San Felipe area as per our conversations last month.

bugdude - 12-9-2006 at 02:13 AM

BW --

Thanks for your interest and efforts. Good luck.

Best wishes to you and your family during the holiday season.

BD