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Photo#394841
Glowworm beetle - Zarhipis integripennis - male

Glowworm beetle - Zarhipis integripennis - Male
Marin County, California, USA
May 11, 2010
Size: 18 mm body length
I caught this beetle with fancy antennae flying out of an oak tree. I suspect it is Zarhipis, but it differs from the Western Banded Glowworm with its black head and much larger size. The California Academy has two other species in its collection from California, Z. tiemanni and Z. truncaticeps. Any opinions?

Images of this individual: tag all
Glowworm beetle - Zarhipis integripennis - male Glowworm beetle - Zarhipis integripennis - male

Moved
Moved from Zarhipis.

Here is some text...
From "Field Guide to Beetles of California" by Arthur V. Evans, James N. Hogue, found by Google.

"The Western Banded Glowworm (Z. integripennis) (males 12.0 to 23.0 mm) (pl. 127) is found in Western Oregon and Washington south through much of California into Baja California and southwestern Arizona. In California it is distributed in all regions below 6,000 ft except in the Great Basin and the Colorado Desert. The color of the upper surface of the head varies from entirely orange to entirely black, except for a small orange area around the mouthparts. The pronotum is usually orange and is occasionally marked with black splotches. The elytra are black to reddish brown. The lower surface of the abdomen is usually orange, or orange with the last two segments black, or mostly reddish black overall.

...

"Zarhipis truncaticeps (12.0 to 16.0 mm) has a black head with a light brown area adjacent to the mouthparts. The pronotum is yellowish orange, while the elytra are black. The abdomen is always black ftom above, while below it varies from yellow with a blackish tip to entirely yellowish orange. The male is attracted to lights in the deserts of southern California and southwestern Arizona from March through May. Zarhipis tiemanni (17.0 mm) is known from the northern Mojave Desert, southern Nevada, and northeastern Arizona. It is found with Z. integripennis in eastern Kern County and is easily distinguished by the much shorter and more pointed elytra."

So it seems like Z. integripennis is used for all Northern Californian specimens, regardless of size/color?

charming; i'll ask around; no idea how variable the color may be
type specimen of Z. truncaticeps is dark-headed, too -- but both the elytra and pronotum look quite diff. to me; that third sp. is apparently not represented in collections available to the California Beetle Project team [zero records], i. e. must be very rare

Moved from Glowworm Beetles.

 
Thanks for the information!
You are right about that one looking more similar to my beetle with the dark head, but it is true that the shape of the pronotum is way off. The beetle in that photo doesn't seem to have as prominent "click beetle corners" to the pronotum as mine does, but perhaps that's just because of the angle of the photograph and position of the specimen.

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