Callistochroma rutilans ( Bates, 1869 ) Bates, 1869

Eya, Bryan K., 2015, Revision of the Genus Crioprosopus Audinet-Serville, and description of three new genera of Trachyderini (Coleoptera: Cerambycidae: Cerambycinae), Zootaxa 3914 (4), pp. 351-405 : 367-369

Callistochroma rutilans ( Bates, 1869) , comb. nov.

( Figs. 43–48 )

Crioprosopus rutilans Bates, 1869:384 (Type locality: Nicaragua, Chontales); 1872:192 (dist.); 1880:75, pl. 6, fig. 3; Gemminger & von Harold, 1872:296 (cat.); Pittier & Biolley, 1895:27 (dist.); Aurivillius, 1912:458 (cat.); Blackwelder, 1946:588 (cat.); Gibson & Carrillo, 1959:120 (cat.); Linsley, 1962:100.

Callona rutilans Chemsak et al., 1992:80 (cat.); Chemsak & Noguera, 1993:63 (cat.); 1995:63 (dist.); Maes et al., 1994:9 (dist.); Monné, 1994:37 (cat.); Monné & Giesbert, 1993:140 (cat.); Swift et al., 2010:31 (dist.); Monné, 2013:724 (cat.).

Redescription. Male: Length, 26–31 mm. Form moderate to large; integument above, glabrous, head thorax and scutellum black, pronotum at sides behind lateral tubercles occasionally with reddish macula, elytra greenishaeneus or splendid blue, very polished; metasternum and underside obscurely reddish to blackish. Head with palpi short, apical segments of labial and maxillary palpi truncate at apices, impressed dorsally; antennae twice as long as body, scape with dorsum impressed over basal ½ to 2/3, segments laterally carinate from apex of 3rd–11th, 3rd segment longer than 1st, 4th subequal to or shorter than 3rd and longer than 1st, 5th subequal to or longer than 3rd, 6th longer than 5th, each segment from 7th–10th subequal to 6th, and 11th longest, almost twice as long as 10th. Pronotum with small tubercles on each side at middle, lateral margin of apical ½ rounded; disc with sides of apical 2/3 densely, confluently punctate, at middle from apex to base nitid with urceolate very sparsely punctate area, pubescence sparse, pale, long, erect near tubercles and base; prosternum narrow, each side above coxae with transverse, deeply punctate area; proepisternum densely, confluently punctate. Elytra 2.3 times as long as broad, glabrate, punctures very fine, and nearly obsolete, apices obliquely subtruncate to rounded, exterior angle obtusely dentate. Legs reddish-yellow, apices and bases of femora, tibiae and tarsi darker; hind femora not extending beyond body. Abdomen with fifth sternite broadly subtruncate at apex, shallowly emarginate medially.

Female: Length, 23–35 mm. Form moderate to robust. Integument similar to male. Antennae extending about 1–1.5 segment beyond elytra, scape with dorsum deeply impressed over basal 3/4, sides of impression carinate, 3rd segment longer than 1st, 4th shorter than 3rd, each segment from 5th–8th sub-equal to 3rd, segments from 9th–10th successively shorter than 8th, 11th appendiculate and subequal to or longer than 3rd. Pronotum with large tubercles on each side at middle, another obtuse tubercle on side of apical ½; disc glabrous, nitid, very sparsely, shallowly punctate, apical and basal margins broadly, shallowly impressed; prosternum finely, sparsely punctate above coxae, striate near apical margin; proepisternum sparsely punctate. Femora reddish-yellow, apices more narrowly, and abruptly darker than male. Abdomen with 5th sternite broadly rounded at apex.

Distribution. Mexico to Panama.

Materials examined. MEXICO: Vulkan Colima, F. Tippmann Wien, Tippman Coll. ’57 213112 (2 females, USNM). COSTA RICA: Alajuela Prov., Zapote de Upala, (vic., Bijugua), 18 III 1973, E. Rodriguez (1 female, EMEC); Cartago Prov., 7 km E. Moravia, 20–29 V 1990, el. 1050 m, Curoe Col. (1 male, 1 female, EMEC); F. Nevermann, 10 April 1935, angelogen um bananal (1 male, USNM). PANAMA: Panama Prov.: Canal Zone: 5 mi SW Gatun, 9o14’N, 79o58’W, 26 May 1971, Stockwell (1 male, EMEC); Cerro Campana: 2600’, 15 Aug 1965, H.G. Real Col., Herman G. Real Col. (1 female EMEC); 2700’, 2 May 1984, E. Giesbert (1 male, FSCA); 2700’, 3 May 1981, E. Giesbert (1 male, FSCA); 27 April–4 May 1992, E. Giesbert (1 male, FSCA); 11–15 May 1980, E.G. Riley & D. LeDoux (1 male, 1 female, ACMT); Chiriqui Prov.: 9 km N La Fortuna “windgap”, 30 May 1987, F.T.Hovore (1 female, CASC).

Note. Callistochroma rutilans can be differentiated from other species of Callistochroma by the color of the integument. Shorter femoral length and lighter coloration will separate C. rutilans from C. cacica (Bates) . The sides of pronotum, metepisternum and (or) the periphery of the metasternum (or the entire metasternum) is usually infuscated or black in C. rutilans compared to C. lampros (Bates) with the sides of pronotum, metepisternum and metasternum yellow-reddish. Apparently, Callistochroma rutilans and Crioprosopus basileus Bates overlap in distribution at the Volcan de Colima, Mexico, where females of both species have been found based on the materials from the Smithsonian collection. The females from these separate genera are remarkably similar in their appearance; however, these can be differentiated as follows: (1) C. rutilans have more tapered elytra with external angles and obliquely angulate apices ( Fig. 14 ) whereas C. basileus have broader less tapered and rounded elytral apices ( Fig. 18 ); (2) C. rutilans females have antennae that are longer than the body whereas the antennae of C. basileus female are shorter and do not attain the apices of elytra; (3) C. rutilans have the disc of pronotum and elytra which are glabrate whereas basileus have finely, densely punctate disc and elytra; (4) the mesosternal intercoxal process of C. rutilans extends below the plane of prosternal intercoxal process ( Fig. 13 a) whereas the mesosternal process of C. basileus do not project below the plane of the prosternal process ( Fig. 17 ); and (5) the metasternum in C. rutilans is covered with pale and transparent pubescence, and the pubescence on the abdomen is mostly limited to the sides of each segment whereas the ventral surface of C. basileus is densely covered with whitish pubescence.

Figures

FIGURES 41 – 52. Dorsal and Lateral view of Callistochroma (cont.). 41, 42: Callistochroma lampros (female, Panama, Arraijan); 43, 44: Callistochroma rutilans (male, Panama, Canal Zone); 45, 46: Callistochroma rutilans (female, Costa Rica, Cartago); 47, 48: Callistochroma rutilans (female, Panama, Chiriqui); 49, 50: Callistochroma viridipennis (male, Ecuador, Esmeralda); 51, 52: Callistochroma viridipurpurea (male, Colombia, Valle).

FIGURES 11 – 18. Comparison of structural characters of Callistochroma and Crioprosopus: Callistochroma lampros: 11: prothoracic sculpture (male), 11 a: punctures confined to anterior angle; 12: prothoracic sculpture (female), 12 a: side of apical half of prothroax obtusely tuberculate; 13: prosternal and mesosternal intercoxal process, 13 a: mesosternal process obtusely tuberculate, extending below 13 b, 13 b: plane of prosternal intercoxal process; 14: elytral apices obliquely angulate, 14 a: outer armature. Crioprosopus basileus: 15: prothoracic sculpture (male), 15 a: disc densely punctate throughout; 16: prothoracic sculpture (female); 17: prosternal and mesosternal intercoxal process; 18: elytral apices rounded or subtruncate.