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Species name

Diabrotica undecimpunctata howardi Barber 1947: 153

 

Common name

12-spotted cucumber beetle, southern corn rootworm

 

Type locality

Unknown

 

Type depository

ZMUC, lectotype, female, verified

 

Synonyms

12-punctata Fabricius 1775: 103 as Chrysomela (type locality: not designated; type depository: ZMUC, lectotype, female, verified)

6-punctata Fabricius 1792: 4 as Crioceris (type locality: Cap. Bon. Spei; type depository: BMNH)

 

Diagnosis

Body length 5.2-7.5 mm. Body width 2.8-3.9 mm. Head basic color black. Antennae filiform, bi- or tricolored, antennomeres 1-3 sulphur yellow, antennomeres 4-11 black. Maxillary palpi and labrum black. Pronotum yellow or sulphur yellow, subquadrate, bifoveate, with small round foveae, shagreened with minute wrinkles. Scutellum black. Elytra green, yellow or rufous, maculate with 12 round black maculae. Elytral epipleura completely yellow, sutural angle of elytra round, punctation scattered, fine. Abdomen yellow. Tarsi black. Tibiae and femora bicolored: yellow, from 1/2 to 2/3 is darkened with black or brown. Aedeagus symmetric, with four internal sac sclerites.

 

Known distribution

USA: AL, AZ, AR, CO, DE, DC, FL, GA, ME.

 

Host plants

Corn (Zea mays L.), Cucurbitaceae (Clark et al., 2004)

 

Potential problems with identification

D. undecimpunctata howardi can be separated from other subspecies by the following features: abdomen and legs, usually only femora, partly pale in D. undecimpunctata howardi, entirely black in D. undecimpunctata undecimpunctata and abdomen black in the middle in D. undecimpunctata duodecimnotata; spots on elytra in D. undecimpunctata howardi are smaller than in D. undecimpunctata undecimpunctata, but larger, than in D. undecimpunctata duodecimnotata and D. undecimpunctata tenella. D. undecimpunctata howardi is larger and more robust than D. undecimpunctata tenella.