Proxys punctulatus

(Palisot de Beauvois, 1818)

Black Stink Bug

Proxys punctulatus, commonly known as the black , is a pentatomid distributed across North America, Central America, and the Caribbean. measure 11–13 mm and are distinguished by their predominantly black coloration with a contrasting yellow spot at the apex of the scutellum. The species is , feeding on both plant juices and insect larvae, and has been documented on crops including blackberry, cotton, soybean, and citrus. Its includes as adults in leaf litter, with -to-adult development completed in approximately 54 days under laboratory conditions.

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Proxys punctulatus by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Proxys punctulatus: /ˈprɒksɪs pʌŋkˈtjʊleɪtəs/

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Identification

The combination of jet black body coloration with a single yellow spot at the scutellar apex distinguishes P. punctulatus from most other North American stink bugs. The pointed and humeral angles, along with the strongly acute , provide additional diagnostic characters. Some predatory stink bugs share similar black coloration but can be separated by other morphological features. In South America, other Proxys may occur; P. punctulatus can be distinguished from at least some by its black femoral apices ("knees"), which are lacking in certain related species.

Images

Appearance

are 11–13 mm in length with a predominantly black body. A distinctive yellow spot is present at the apex of the scutellum. The and humeral angles of the pronotum are pointed. The six legs are black with cream-colored markings. The is strongly acute, giving a pointed "nose" appearance.

Habitat

overwinter in leaf litter near plants. During the growing season, the is associated with herbaceous vegetation including blackberry, spiderwort (Tradescantia subaspera), cotton, soybean, and citrus. Specific requirements beyond proximity to host plants have not been documented.

Distribution

North America (including the United States), Central America, the Caribbean, and northern South America. GBIF records confirm presence in the Caribbean, Middle America, and North America.

Seasonality

become active in June in at least part of the range (Illinois). occurs following spring . The overwinters as adults, suggesting a single per year in temperate regions, though this has not been explicitly confirmed.

Diet

. Feeds on plant juices from blackberry, spiderwort (Tradescantia subaspera), cotton, soybean, and citrus. Also preys on insect larvae. Feeding produces disfigured leaves and discolored stem areas, though damage is typically minor due to low densities.

Host Associations

Tradescantia subaspera - plantLaboratory rearing substrate; confirmed
Rubus (blackberry) - plantfield observation
Gossypium (cotton) - plantfield observation
Glycine max (soybean) - plantfield observation
Citrus - plantfield observation

Life Cycle

Overwinters as in leaf litter. are laid singly rather than in masses. Five nymphal instars precede adulthood. Under laboratory conditions (constant temperature and light, reared on Tradescantia subaspera): egg incubation averages 9.04 days; nymphal instars average 5.06, 7.15, 7.56, 9.32, and 15.93 days respectively for instars 1–5. Total developmental time from egg to adult averages approximately 54 days under these conditions.

Behavior

Attracted to traps baited with Euschistus , a response shared with many other . Some predatory stink bugs with similar black coloration can stab with their to deter ; whether P. punctulatus exhibits this is unknown. The distinctive coloration may function in aposematic signaling of unpalatability to predators such as birds.

Ecological Role

Functions as both herbivore and , potentially contributing to of insect larvae while also causing minor plant damage. densities remain low enough that significant ecological or agricultural impact is uncommon.

Human Relevance

Minor agricultural pest on soybean, cotton, citrus, and blackberry. Damage is usually insignificant due to low levels. Attracted to Euschistus traps, which may be useful for monitoring. Subject of laboratory studies on and development.

Similar Taxa

Proxys sp. (Brazil)Similar jet black coloration with white/yellow scutellar spot and strongly acute , but distinguished by lack of black femoral apices ("knees") present in P. punctulatus
Proxys victorOccurs in Brazil; similar coloration pattern but morphological differences in illustrations suggest distinct
Proxys hastatorRecorded from French Guiana; congeneric with potentially overlapping range but insufficient information to confirm field identification criteria
Predatory black-colored stink bugsShare aposematic black coloration but differ in other morphological features and possess predatory -stabbing defensive not confirmed for P. punctulatus

More Details

Laboratory Rearing

Successful laboratory rearing has been achieved on Tradescantia subaspera under controlled conditions, with detailed developmental timing established.

Pheromone Response

Attraction to Euschistus is documented; this cross-attraction may complicate -specific monitoring efforts.