SUBFAMILY AMBRYSINAE USINGER, 1941

FIGS 3C, 10A, 11A

Type species: Ambrysus signoreti Stål, 1862.

Taxonomic history: This subfamily was established by Usinger in 1941, but was downgraded to tribe level and placed in Naucorinae (Popov, 1970), then transferred to Cryphocricinae (Štys & Jansson, 1988) and ultimately elevated and restored to subfamily rank (Reynoso-Velasco & Sites, 2021). Significant recent changes in the generic composition of the subfamily include the transfer of Pelocoris in from Naucorinae, and the erection of the genera Australambrysus Reynoso & Sites, 2021 and Maculambrysus (Reynoso-Velasco & Sites, 2021). The subfamily currently includes Ambrysus Stål, 1862, Australambrysus, Carvalhoiella D e C a r l o, 1 9 6 3, C a t a r a c t o c o r i s U s i n g e r, 1 9 4 1, H y g r o p e t r o c o r i s S i t e s, 2 0 1 5, M a c u l a m b r y s u s Reynoso & Sites, 2021, Melloiella De Carlo, 1 9 3 5, Pe l o c o r i s, P i c r o p s L a R i v e r s, 1 9 5 2 a n d Procryphocricos J. Polhemus, 1991. Species of all of these genera, except Pelocoris, were included along with Cryphocricos in the subfamily Cryphocricinae prior to the revision by Reynoso-Velasco & Sites (2021).

Revised taxonomy: The subfamily was recently revised by Reynoso-Velasco & Sites (2021). No further taxonomic action is proposed here.

Diagnosis: Diagnostic features were provided by Reynoso-Velasco & Sites (2021) as follows: (1) labium inserted near the anterior margin of the head; (2) labrum well developed; (3) maxillary plates only slightly produced anteriorly; (4) anterior margin of the pronotum generally with a concavity of different depths, but straight in Pelocoris; (5) pronotum with lateral margins smooth or finely crenate; (6) prosternellum concealed by the mesally directed propleural projections, but prosternellum exposed in Pelocoris and Procryphocricos; (7) forewing macropterous, but brachyptery also present in Procryphocricos; (8) no sternal abdominal sense organs (hydrostats), except in Procryphocricos; (9) compressible air-bubble respiration, but a plastron could be used by brachypterous Procryphocricos; (10) pubescent abdomen (scattered long setae in Procryphocricos); and (11) males with vesica not modified into a long tubular structure.

C o m m e n t s: A l l s p e c i e s i n t h i s s u b f a m i l y a r e distributed exclusively in the New World.