More caterpillar help needed

[Jeffrey Glenn Schultz]

I recently received a caterpillar, from a teacher in my school
district, whose ID has me baffled. Your assistance will be greatly
appreciated.

This critter is a hornworm of some 70 mm in length. Green is the basic
ground color (lightish to medium. Dorsolaterally the areas to be a two
rows (one on each side) of brownish lines that merge into eyespots
dorsolaterally. The frontal eyespots are enlarged and become more so when
the larva is at rest. 

I believe the larva to be a Tersa Moth larva(Sphingidae) as I tentatively
ID the host plant as _Penta_ or star cluster. However, I can  not find a
photo of the larva anywhere. 

TIA  :-)

jeff schultz
science center teacher
r.a. vines science center
spring branch isd
8856 westview
houston, tx  77055
ph: 713-36504175
fx: 713-365-4178
jschultz at tenet.edu