Thyanta (Argosoma) obsoleta (Dallas)

Thyanta (Argosoma) obsoleta (Dallas)

Figs. 183- 197, Map 7

Pentatoma obsoleta Dallas, 1851:251 ; Walker, 1867:289.

Thyanta obsoleta: Lethierry and Severin, 1893: 148 ; Kirkaldy, 1909:94.

Thyanta casta (ofauthors, not Stal): Van Duzee, 1904: 52, 54 (part); Kirkaldy, 1909: 94 (part); Barber, 1923:12; Barber, 1939:292-293.

Diagnosis. Coloration green to pale brown, often with transhumeral reddish markings that sometimes form two oblong spots, one each side of middle.

Lateral jugal margins subparallel for middle third of distance from eyes to apex ( Fig. 184). Anterolateral margins of pronotum straight to slightly concave in dorsal view; humeral angles rounded to angulate, usually produced beyond base of adjacent corium by about half width of eye ( Fig. 183). Pronotal cicatrices immaculate. Ostiolar canals acuminate apically. Posterolateral abdominal angles piceous; postspiracular black spots usually absent, sometimes evident in brown form.

Mesial margins of basal plates in caudoventral view straight to slightly convex; posterior margins slightly convex; posteromesial angles broadly rounded ( Fig. 195). Sclerotized rod swollen subapically, narrowed apically ( Fig. 196); spermathecal duct moderately swollen below proximal flange with only slight amount of coiling ( Fig. I 97). Posterior margin of pygophore broadly and shallowly U-shaped in caudal view ( Fig. 191); in lateral view concave ( Fig. 194); posterior margin only slightly concave in dorsal view, posterolateral angles not prominent ( Fig. 193); posteroventral surface distinctly produced into blunt chin-like protuberance in ventral view ( Fig. 192). Each paramere apically rounded in ectal view ( Fig. 186); narrowly rounded from medial view, curving dorsad; concave surface oriented more dorsad than mediad ( Fig. 185); roughened spiculate area on lateral surface circular ( Fig. 187). Each lateral conjunctiva! lobe of aedeagus with l or 2 subacute diverticula ( Fig. 190), dorsomedial lobe reduced ( Fig. 189); median penial lobes large, spatulate ( Fig. 188); penisfilum reduced.

Types. Dallas (1851) described Pentatoma obsoleta from Jamaica without designating a holotype or paratypes, and it is not possible to determine the number of specimens upon which he based his description. Only l 'i' syntype was located, and it is here designated the lectotype. It is labeled (a) "Jamaica" [dorsal surface], "45 1111" [ventral surface] (b) " Type " (c) "35. Pentatoma obsoleta ." The lectotype, which is housed in the British Museum of Natural History (London), was examined.

Distribution. Greater Antilles ( Map 7).

Specimens examined. 60 specimens collected during every month ofthe year except September; deposited in AMNH, ARH, BMNH, CAS, CNC, CU, DAR, DBT, ENGL, LHR, OSU, SMEK, UAT, USNM. BAHAMA ISLANDS: San Salvador Island . CUBA: Ciudad de la Habana: El Cano ; Havana . Guantanamo: Guantanamo Bay Naval Base , Caravella Point . Santiago de Cuba: Daiquiri ; Jarahueca . JAMAICA: Bluefields ; Christiana ; Mona , near Kingston ; St. Andrew Ferry ; Try . Duncans . St. Andrew: Bamboo Lodge near Irish Town . Westmorland: Negri ! , Negrillo Cottages . HAITI: Diquini . Guest: Port-au-Prince . DOMINICAN REPUBLIC: Los Hidalgos ; 8 mi up Macoris River , Santo Domingo . Distrito Nacional: La Victoria ; Santo Domingo City . Peravia: 13 km NW Bani . Samana: Sanchez . San Cristobal . San Juan: 16 km SE San Juan ; 28 km E San Juan . PUERTO RICO: Aguirre ; Fortuna A . E.S. Humacao: Vieques Island , Puerto Real . Mayaguez: Guanica Forest , Hwy 334 at Ranger Station . Ponce: Coamo Springs ; Ponce .

Comments. Examination of the male genitalia is necessary to separate this species from other species in the maculata group. Thyanta obsoleta can be distinguished from other Northern Hemisphere species by its apically rounded parameres, which have the concave surface oriented more dorsad than mediad.