A new genus and two new species of South American Myodochini (Hemiptera, Heteroptera, Rhyparochromidae)

Abstract The new Neotropical genus Henryaria (Heteroptera, Rhyparochromidae, Myodochini) is established to accommodate two new species from Bolivia and Peru. Photographs of the types and their male genitalia are provided. Similarities with other genera of the tribe are discussed, as well as the characters to distinguish the two new species.


Introduction
The Rhyparochromidae are the most diverse group of the Lygaeoidea with more than 2,000 species (Henry et al. 2015). It is divided into two subfamilies Plinthisinae and Rhyparochrominae, the latter of which includes 14 tribes (Henry 1997).
The Myodochini comprise 77 extant genera and 368 species worldwide; 38 genera and 121 species are known from the Neotropics (Dellapé and Henry 2017). Many species live on the ground, where they feed on fallen seeds. The species that ascend plants to feed are the most commonly collected myodochines. Other species live in forest canopies Henry 2010, Henry et al. 2015). As most rhyparochromids do, the members of this tribe feed on mature seeds. Many species are myrmecomorphic, and in some cases, although they are not morphologically similar to ants, both adults and nymphs mimic them in their movements (Slater and Baranowski 1990).
Phylogenetic relationships within the tribe are not clear. The only attempt to establish a cladistic framework is Harrington's (1980) analysis, where four main groups, representing 56 genera, were established based mainly on characters of the male genitalia. Since then, new genitalic studies and the discovery of new taxa have led to a need for a taxonomic update and reevaluation of relationships.
The actual diversity of the group is much higher than the current numbers indicate (Henry et al. 2015). For example, in the recent revision of the Neotropical genus Heraeus, 30 new species and two new genera were described (Dellapé et al. 2016).
In the present contribution a new genus is described to include two new species from Bolivia and Peru.

Materials and methods
Color images were captured using a digital camera (Micrometrics 391CU, 3.2 m) mounted on a Nikon SMZ1000 stereomicroscope. Multiple focal planes were merged using Micrometrics SE Premium 4 software.
The genital structures were dissected under a stereomicroscope, cleared in a 10% KOH aqueous solution, washed in distilled water, and preserved in a vial with glycerin. All measurements are in millimeters. The acronyms used are USNM for the National Museum of Natural History, Washington, D.C., USA, and MLP for the Museo de la Plata, La Plata, Argentina.
Diagnosis. Head strongly convex behind eyes, forming short neck; eyes relatively small, not surpassing dorsal margin of head; jugal ridge developed; vertex rounded; buccular juncture V-shaped. Evaporative area extensive. Mesepimeron emergent. Profemur incrassate, with two rows of spines; aedeagus without spines, seminal duct on vesica and gonoporal process distinctly wide; gonoporal process broadened towards apex.
Description. Relatively small (ca. 6 mm long), pilose. Head (11)(12)(13)(14) shiny, with many grouped punctures forming a coriaceous texture; head strongly convex behind eyes, forming a short neck; eyes relatively small, not surpassing dorsal margin of head in lateral view; ocelli closer to eyes than to posterior margin of head; jugal ridge developed; vertex rounded; buccular juncture V-shaped at level of antenniferous tubercles. Scape relatively short but surpassing apex of head.
Etymology. This new genus is named after our dear friend Thomas J. Henry (Systematic Entomology Laboratory [SEL], ARS, USDA, c/o National Museum of Natural History, Washington, DC), in honor of his many fundamental contributions to the knowledge of Heteroptera. Besides his brilliant career, Dr. Henry has been a role model to us, always sharing his knowledge and passion for true bugs.
Etymology. The specific epithet refers to the river where the specimen was collected.

Discussion
Henryaria gen. n. runs to couplet 35 in Harrington's (1980) key to the Myodochini of the world, and to couplet 26 in the key by Henry et al. (2015) to the Neotropical genera of Myodochini. In both keys the genera Neopamera Harrington, 1980 and Orthaea Dallas, 1852 are recognized. Neopamera was erected by Harrington (1980) to include several New World species that lack synapomorphies for the genus. The type species, N. bilobata (Say, 1831), has the following character states useful for generic diagnosis: postocular region of head wide not forming neck; male protrochanters with small spine and procoxa with two large spines, and females with profemora less incrassate, trochanters without spines and single spine on procoxa; seminal duct of vesica and gonoporal processes slender. In contrast, the genus Orthaea includes large species (Dellapé and Montemayor 2008) ranging from 8.4 to 10.5 mm long. In addition to the slightly elongate head placed at a lower plane than the posterior lobe, as mentioned by Harrington (1980), the species of Orthaea are defined by the long scape, at least as long as the head, and the elongated and slightly stout male profemur (Dellapé and Montemayor 2011). Since the key to the Neotropical genera of Myodochini appeared (Henry et al. 2015), two new genera have been described (Dellapé et al. 2016): Baranowskiobius Dellapé, Melo and Henry and Paraheraeus Dellapé, Melo and Henry. The species included in both genera are larger and more slender (ca. 7 to > 10 mm long), with a postocular region longer than the interocellar length, and less convex, not abruptly constricted, forming a distinct but short neck as in Henryaria species. The two new species included in Henryaria are similar in general aspect and color patterns, but they can be distinguished by the shape of the head. Henryaria zongo sp. n. presents a shorter and globose head, with a strongly convex dorsal region; the labium is shorter with segment four in resting position between procoxae; and the profemur is more incrassate and almost entirely brown except the extreme base and apex. In contrast, H. thomasi sp. n. has a more elongate head; the labium is longer, extending beyond the procoxae; the profemur is less incrassate and the basal and apical pale areas of the profemur are more extended. The male genitalia are similar in both species, but the parameres show differences in the length of the blade (shorter in H. thomasi) and in the shape of the inner projection of the dorsal aperture of the pygophore.