Species name

Diabrotica fenestralis Jacoby 1879: 791


Type locality

Chontales, Nicaragua


Type depository

MCZ, lectotype, female, verified



Body length 5.8-5.9 mm. Body width 2.9-3.0 mm. Head basic color black. Antennae filiform, bi- or tricolored, antennomeres 1-3 yellow, upper sides darkened, antennomeres 4-8 gradually infuscated, antennomeres 9-10 uniformly yellow ocher, antennomere 11 brussels brown. Maxillary palpi black or piceous, labrum black. Pronotum yellow or mustard yellow, subquadrate, weakly bifoveate, with wide shallow foveae, not shagreened. Scutellum black. Mesothorax black, infuscated or yellow. Metasternum black, metepisternum black, metepimeron black or paler, from yellow ocher to amber brown. Elytra yellow or rufous, with 2-3 black bands, connected into ring-shape maculae or reduced to a few spots on each elytron, sometimes the bands are completely reduced on the elytral disk. Elytral epipleura completely yellow. Sutural angle of elytra round, punctation dense, fine. Abdomen yellow. Tarsi and tibia black or piceous, profemora uniform black or piceous. Meso- and metafemora bicolored: apex (approximately 1/3) is darkened with black or brown. Aedeagus symmetric, with three internal sac sclerites.


Known distribution

Nicaragua, Costa Rica


Host plants




The type specimen of D. fenestralis in the MCZ is female. We studied the paralectotype of D. fenestralis in the Jacoby collection in BMNH. This specimen is a male and it is identical in the coloration with the type female. We treat it as the male of D. fenestralis.


Potential problems with identification

Diabrotica fenestralis Jacoby is very similar to D. morosa Jacoby. They can be separated by the following features: meso- and metafemora of D. fenestralis are bicolored: apex (approximately 1/3) is darkened with black or brown, but the legs are entirely black in D. morosa; number of internal sac has three sclerites in D. fenestralis, and four in D. morosa.