Forewings are gray to light gray with dark-brown to black markings. Many individuals have a row of black dots or dashes along the termen and a white dot below two dark markings on the apex. Hindwings are brown.
Adults may appear similar to many other species of Cydia. A genitalic dissection can be used to confirm identity.
Larvae are whitish and unmarked with a brown head. Although similar to those of many other Cydia, larvae are unlikely to be encountered outside of a Euphorbiaceae seed.
Larvae tunnel inside the seeds of the host plant and feed inside. The seeds eventually drop from the host plant during the summer rainy season. Larvae are able to move or "jump" the seeds, or "beans," by rapid twitching; this behavior is triggered by temperature and may be a mechanism to move the seed to a more favorable location (such as out of direct sunlight). Larvae overwinter within the seed and pupation occurs the following spring. Adults emerge from the seed through a circular "door" that is cut by the larva prior to pupation.
Larvae of Cydia deshaisiana feed inside the seeds of various species of Euphorbiaceae.
Sebastiania bilocularis S. Watson
arrow poision plant
Sebastiania pavoniana (Mull. Arg.) Mull. Arg.
Mexican jumping bean
Cydia deshaisiana is a native of Mexico and is found in the northern states of Sinoloa and Sonora. The "Mexican jumping bean capitol of the world" is supposedly near the town of Alamos, Sonora.
"Mexican jumping beans" are frequently imported into the U.S., occasionally in large numbers. Several websites are available that supply the "beans," complete with live larvae, on a commercial scale. Such sites include: http://www.jbean.com/ and http://www.jumpingbeansrus.com/.