Larva and puparium: Anterior fold with a narrow spicule band. Crochets of metathoracic prolegs forming a U-shaped band. Metathorax with lateral folds bearing broad setae at sensilla 4 and 5. Anal lobe with spicules. Posterior breathing tube with AP 1.5¥ length of TR, smooth, shining and tapering. Pupal spiracles about 0.94¥ length of AP.

Taxonomic notes: Copestylum limbipenne is most similar to other members of the Marginatum group in having the AP longer than the width of the TR. It is distinguished from all these species except C. truncatum sp. nov. by the narrow band of spicules on the anterior fold and U-shaped arrangement of crochets on the mesothoracic prolegs. It is separated from C. truncatum by the tapering AP, which is longer than the width of the TR.

Material examined (CIBIO, NMS): one larva MEXICO, Tehuacán, Puebla Zapotitlán, Salinas, Jardín Botánico 6–10.vii.1999 E. G. H., M. A. M., G. E. R. ex decaying platyclade of unidentified Opuntia species (Cactaceae); 23 ♂, 17 ♀, 40 puparia MEXICO, Oaxaca, Santiago Dominguillo 14.vii.1999 E. G. H., M. A. M., G. E. R. ex decaying stem of fallen S. stellatus (Cactaceae); 2 ♂, 2 ♀, four puparia, two larvae MEXICO, Oaxaca, Valerio Trujano 14.vii.1999 E. G. H., M. A. M., G. E. R. ex decaying stem of Escontria chiotilla (F.A.C. Weber) Rose 1906, 8 ♂, 12 ♀, 20 puparia MEXICO, Oaxaca, Cuicatlán, Cerro Colorado 14–17.vii.1999 E. G. H., M. A. M., G. E. R. ex decaying stem of fallen S. stellatus; 1 ♀, one puparium, one larva MEXICO, Oaxaca, Cuicatlán, Cerro Colorado 17.vii.1999 E. G. H., M. A. M., G. E. R. ex decaying stem of fallen Pachycereus hollianus (F.A.C. Weber) Buxb. 1961 (Cactaceae); 6 ♂, six puparia COSTA RICA Guanacaste, Santa Rosa, Playa Naranjo 27–29.vi.2000 DBC, E. G. H., G. E. R. ex decaying platyclades of O. guatemalensis (Cactaceae) (INBio); 2 ♂, 3 ♀, five puparia MEXICO, Chiapas, Mazapa de Maderos, 850 m, 22–25.vi.2004 M. A. M. and C. P. B.; 1 ♂, 2 ♀, three puparia COSTA RICA, Guanacaste, Santa Rosa, 18–19.i.2005 C. P. B. and M. Zumbado (INBio); 2 ♂, two puparia, 21 larvae MEXICO, Hidalgo, Metztitlán 18–22.viii.2005 ex decaying stem of fallen Stenocereus sp. M. A. M..