Thyanta (Thyanta) spectabilis Ruckes

Rider, David A. & Chapin, J. B., 1992, Revision of the genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) II. North America, Central America, and the West Indies., Journal N Y Ent Soc 100 (1), No. 1, pp. 42-98 : 69-70

Thyanta (Thyanta) spectabilis Ruckes

Figs. 78-92, Map 6

Thyanta spectabilis Ruckes, 1957c: 175- 178 , figs. 3-4.

Thyantaperditor (ofauthors, not Fabricius): Van Duzee, 1923:127.

Diagnosis. Rubiginous transhumeral band usually present; often tylus and vertex of head reddish.

Lateraljugal margins sinuous, not parallel ( Fig. 79). Anterolateral pronotal margins concave, not piceous; humeral angles spinose, spines directed primarily laterad and only slightly cephalad ( Fig. 78). Mesial comer of each pronotal cicatrice usually piceous. Each abdominal stemite with postspiracular black spot on each side, anterolateral and posterolateral angles piceous.

Basal plates in caudoventral view with mesial margins straight to slightly convex; separated basally; posterior margins sinuous ( Fig. 80). Spermathecal bulb digitiform, but with numerous short protuberances ( Fig. 82). Pygophoral opening subtended by semicircular impression; posterior margin of pygophore produced posterodorsad, in ventral and dorsal views convex medially with small, medial V-shaped emargination ( Figs. 84, 85); slightly concave in lateral view ( Fig. 86).

Types. Ruckes (1957c) described Thyanta spectabilis from 255 and 6!i?!i? specimens, all from Baja California, Mexico. The 5 holotype was examined and is presently conserved in the California Academy of Sciences (San Francisco).

Distribution. Baja California, Mexico ( Map 6).

Specimens examined. 17 specimens collected during every month ofthe year except February, April, September, and October; deposited in CAS, DBT, UCB, UIM, UNAM, USNM. MEXICO: Lower California ; 2 km W El Centemario . Baja California Norte: Bahia de los Angeles . Baja California Sur: Cabo San Lucas ; 28 mi S El Arco Mine , Rancho Santa Marguerita ; 2 mi E El Coyote , NE of La Paz ; 6 mi S, l mi E El Pescadero ; La Paz ; 6 km S San Pedro ; Santa Anita ; 7 mi N Santa Anita ; 2 km SE, 3.5 km NE Santa Rita ; 21.6 mi N Todos Santos ; Venancio .

Comments. Thyanta spectabilis is very closely related to T. perditor, and may actually be a subspecies of that species. The genitalia of the two species are virtually identical; the only difference is that the parameres in T. spectabilis are somewhat larger than those in T. perditor. This is expected, however, since specimens of T. spectabilis are larger than those of T. perditor . The only reliable character to separate the two species is the orientation of the humeral spine. In T. perditor the humeral angle is directed anterolaterad, while in T. spectabilis it is directed primarily laterad and only slightly cephalad.