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Species name

Diabrotica bioculata Bowditch 1911: 16

 

Type locality

Jalapa, Mexico

 

Type depository

MCZ, lectotype, male, verified

 

Synonyms

peckii Bowditch 1911: 53 (type locality: Brit. Honduras, Manatee Dist.; type depository: MCZ, holotype, male, verified)

 

Diagnosis

Body length 5.8-6.8 mm. Body width 3.0-3.3 mm. Head basic color black. Antennae filiform, male antennae with thickened antennomeres 4-6, bi- or tricolored, antennomeres 1-3 uniformly sulphur yellow or yellow with darkened upper side, antennomeres 4-8 uniformly cinnamon brown, antennomeres 9-10 uniformly yellow ocher or yellow, partly infuscate, antennomere 11 completely dark (cinnamon brown). Maxillary palpi black, piceous or amber brown, labrum black. Pronotum yellow, mustard yellow or sulphur yellow, subquadrate, weakly bifoveate with wide shallow foveae, shagreened with minute wrinkles. Scutellum yellow or yellow ocher. Basic color of elytra yellow or rufous, with 2-3 black bands, anterior bands connected into ring-shape maculae. Posterior maculae oculate or shapeed as opened rings. Epipleura completely yellow, Elytra not sulcate, sutural angle round, punctation scattered, fine. Abdomen yellow. Tarsi and tibia black or amber brown, femora uniformly yellow. Internal sac with five sclerites.

 

Known distribution

Mexico, Belize, Costa Rica

 

Host plants

Unknown

 

Remarks

Bowditch (1911) indicated the differences between D. bioculata and D. peckii being slightly different coloration of antennae and elytrae, pronotum foveation and elytrae punctation. All these features are subject of substantial variation within the same species. We studied the internal sac of aedeagus in the types of both species. No substantial differences were found in the internal sac armament. Both type specimens are very similar in the external features. Hereby we treat D. peckii as synonym of D. bioculata.

 

Potential problems with identification

Diabrotica bioculata is very similar to many of the "oculate" species such as D. gratiosa Baly, D. adelpha Harold, D. biannularis Harold, D. pulchella (Jacquelin-du-Val). Diabrotica bioculata, the closest species to D. biannularis, can be well separated by tibia color, which are brown or black in D. bioculata. Diabrotica pulchella can be separated by the same feature, since its tibia are yellow. The pronotum in D. adelpha is nonfoveate, but bifoveate in D. bioculata. Pronotum and elytrae in D. adelpha are more convex than in D. bioculata. The shape of the internal sac sclerites allows distinguishing D. bioculata from all other species too. Sclerite 5A is quite remarkable, it is a narrow flat plate, widened and toothed apically, bearing extremely long, bent, pointed hook basally.