frass expulsion

Rudy Benavides rbenavid at hotmail.com
Sat Aug 4 10:17:02 EDT 2001


Liz,

Looking at the process in a later growth stage monarch cat, 2nd instar (@ 
6mm), it only elevates the tip of abdomen slightly and expels frass just a 
few mm away from its body....nothing like the 1st instar's more distant 
'slinging' expulsion.

Cheers,

Rudy/MD
------------------------------

>From: "Rudy Benavides" <rbenavid at hotmail.com>
>Reply-To: rbenavid at hotmail.com
>To: LEPS-L at lists.yale.edu
>Subject: Re: frass expulsion
>Date: Sat, 04 Aug 2001 08:14:44 -0400
>
>Liz asked:
>>Do most caterpillars shoot their frass out like this?
>
>A 1st instar monarch caterpillar (< 2 mm)that I have in a petri dish is
>doing just that.  It raises the tip of its abdomen (scorpion-like) and 
>fires
>the frass away from itself.
>
>Rudy/MD
>
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