Gymnandrosoma leucothorax (Adamski & Brown) (Tortricidae: Olethreutinae: Grapholitini)
FWL: 7.9-9.0 mm (males); 9.1-11.2 mm (females)
Head dark brown, terminal segment of labial palpus white; thorax usually (but not always) with mesonotum and mesoscutellum white; male without sex scales on hind tibia; ground color of forewing brown to reddish-brown, fasciaefasciae:
plural of "fascia"
poorly-defined, postmedian dot present, white; hindwing brown.
Male genitalia are characterized by the absence of an uncusuncus:
a sclerotized process which is fused to the posterodorsal margin of tergum IX
and sociisocii:
a pair of lightly sclerotized setose lobes
, distally-swollen valvaevalvae:
plural of "valva"
with short, evenly-spaced spines on the laterallateral:
to the side
margin, and a slender, pistol-shaped phallusphallus:
the male intromittent organ (penis); see "aedeagus" 
. Female genitalia are characterized by simple, narrow papillae analespapillae anales:
the female ovipositor lobes 
; a scobinatescobinate:
rasplike
patch near the junction of the corpus bursaecorpus bursae:
a dilated membranous sac at the anterior end of the bursa copulatrix
and ductus bursaeductus bursae:
a membranous tube connecting the ostium bursae to the corpus bursae
; ductus bursaeductus bursae:
a membranous tube connecting the ostium bursae to the corpus bursae with a single spiral; and a pair of large, knife-like, opposed signasigna:
plural of "signum"
.
Although not described, larvae are assumed to be similar to other species in the Cryptophlebia-Ecdytolopha group, with an enlarged L-pinaculum on the prothoraxprothorax:
the most anterior thoracic segment
that extends beneath (and usually beyond) the spiracle.
Gymnandrosoma leucothorax can be easily separated from other species of Gymnandrosoma by the conspicuous white scaling on the thorax of both sexes.
Adults have been reared from the fruits of guava (Psidium guajava) in Puerto Rico. If they are anything like other members of the genus, they likely bore in the fruits of other plants as well. Records exist from June through October.
| Host plant | Host plant family | Reference(s) |
| Psidium guajava | Myrtaceae | USNM collectionUSNM collection: USNM collection. Based on identified reared specimens in the collection of the National Museum of Natural History, Washington, D.C.; Adamski & Brown 2001 ; APHIS interception (bardcode) |
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Gymnandrosoma leucothorax is distributed throughout the Greater Antilles (records from Cuba, Jamaica, Hispaniola, and Puerto Rico) at elevations up to 1500 m.
