Diabrotica quadricollis Jacoby

Species name

Diabrotica quadricollis Jacoby 1887: 516

Type locality

Guatemala, Cubilguitz in Vera Paz

Type depository

BMNH, holotype, male, verified

Diagnosis

Body length 5.8-6.4 mm. Body width 3.0-3.2 mm. Head basic color black. Antennae serrateserrate:
in reference to antennae, saw-like, often with a sharp ridge on the outer margin
, with thickened antennomeres 4-8, bi- or tricolored, antennomereantennomere:
"segment" of antenna, more or less clearly separated
1 uniformly yellow, antennomeres 2-3 yellow, upper sides darkened, antennomeres 4-8 cinnamon brown, antennomeres 9-10 sulphur yellow, antennomereantennomere:
"segment" of antenna, more or less clearly separated
11 dark apically. Maxillary palpi black or chestnut, labrumlabrum:
the "upper lip" of beetles, a movable sclerite joined under clypeus
black. Pronotumpronotum:
the notum of the prothorax with highly sclerotized pronotal disc
yellow or light cadmium, quadrate, nonfoveate, shagreened with microsculptural narrow, long meshes. Scutellumscutellum:
small, usually triangular shield between the bases of elytra
black or amber brown. Elytra yellow or rufous, with two black bandsbands:
(here) transverse maculae on the beetle elytra
, one on the base, another behind the middle of elytronelytron:
<em>(pl. elytra)</em> the fore highly sclerotized wing of beetle
. Bandsbands:
(here) transverse maculae on the beetle elytra
may be connected together, than elytra become almost entirely black with small yellow spots. Elytral epipleura completely yellow, sutural anglesutural angle:
the posterior angle or apex of the elytron near the suture
of elytra round, punctation scattered, fine. Abdomen yellow. Tarsi and tibiae black or chestnut, femora yellow. Aedeagusaedeagus:
the main sclerotized part of the male genitalia; "aedeagus" is used here instead of "median lobe of aedeagus"
symmetric, with five internal sac scleritessclerites:
(here) the sclerotized hooks, spines or plates in the internal sac
.

Known distribution

Honduras, Guatemala

Host plants

Unknown

Potential problems with identification

Diabrotica quadricollis Jacoby is very similar to D. adelpha Harold and D. godmani Jacoby. They can be separated by the following features: scutellumscutellum:
small, usually triangular shield between the bases of elytra
is yellow in D. godmani, but black or amber brown in D. quadricollis; legs are bicolored in D. quadricollis, but yellow in D. godmani; internal sac of aedeagusaedeagus:
the main sclerotized part of the male genitalia; "aedeagus" is used here instead of "median lobe of aedeagus"
is completely different in all species.