Parimatidium Spaeth 1938: 307

Synonomys

Xenispa Baly 1858: 63.

Type Species

Imatidium rubrum Boheman.

Diagnosis

Parimatidium can be distinguished by the following combination of characters:

• the lateral margins of the pronotumpronotum:
  occupies all of dorsal part of the prothorax; in anterior angles or posterior angles there may be a small tubercle or pore with a seta
  and the elytra without long, stiff spines
• the head without a frontal horn; mouthparts not projecting forward, interantennal carina not distinct
• the pronotumpronotum:
  occupies all of dorsal part of the prothorax; in anterior angles or posterior angles there may be a small tubercle or pore with a seta
  with a seta in each anterior angle
• the apex of the elytra without a tooth-like projection
• the elytra without costae, rounded, posterior margin serrulate
• the antennae with 11-antennomeres, filiform

Description

Head: posterior fronsfrons:
upper anterior portion of head capsule above the clypeus
flattened and anterior part depressed; interocular space less than the width of an eyeeye:
elongate, slightly prominent, multifaceted; usually slightly kidney-shaped
; eyeeye:
elongate, slightly prominent, multifaceted; usually slightly kidney-shaped
large; interantennal carina and transverse carina behind labrumlabrum:
triangular, joined to the clypeus and the oral orifice
absent; labrumlabrum:
triangular, joined to the clypeus and the oral orifice
distinct; maxillary palp with palpomere 4 longer than 3.

Antenna: with 11-antennomeres, not thickened apically; antennomere 3 longer than 2; 11 longer than 10.

Pronotum: emargination on anterior margin shallow, without notch external to anterior seta; lateral margin strongly convergent from base to apex; lateral impressions absent; posterior angle sharp and acute.

Scutellum: broadly triangular.

Elytron: lateral margin laminate, serrulate externally toward apex, slightly indented behind humerus; with 10 rows of punctures plus scutellar row.

Venter: metepisternum distinct posteriorly; hypomera with transverse impression external to anterior coxal cavities.

Leg: tibiatibia:
variable in length; joins femur and tarsus
not pointed externally, excavated subapically.

Distribution

Bolivia, Brazil, Colombia, Costa Rica, Ecuador, French Guyana, México, Panamá, Paraguay, Peru, Venezuela.

World Fauna

Described species: 26 (Staines 2012). Key to the species: Spaeth (1938); Aslam (1965).

Hosts

Cocos, Geonoma (Arecaceae); Heliconia (Heliconiaceae); Bambusa, Chusquea (Poaceae).

References

Aslam, N. A. 1965. OnHispoleptis Baly (Coleoptera, Hispidae) and Imatidium F. (Coleoptera, Cassididae). The Annals and Magazine of Natural History (13)8:687-693.

Baly, J. S. 1858. Catalogue of Hispidae in the collection of the BritishMuseum. London, 172 pp.

Spaeth, F. 1938. Die Gattung Himatidium Fabr. (Col. Cassidinae). Revista de Entomología Rio de Janiero 9:305-317.

Staines, C. L. 2012. Tribe Imatidiini. Catalog of the hispines of the world (Coleoptera: Chrysomelidae: Cassidinae). http://entomology.si.edu/Collections_Coleoptera.html