Xanthonia furcata Staines and Weisman, 2001

Riley, Edward G., Weisman, Donald M. & Quinn, Michael A., 2019, A taxonomic review of the Xanthonia species occurring in Texas (Coleoptera: Chrysomelidae, Eumolpinae), Zootaxa 4668 (1), pp. 1-29 : 20

12. Xanthonia furcata Staines and Weisman

( Figs 3 , 74–75 , 78 ; Map 2 )

Xanthonia furcata Staines & Weisman 2001a: 165 . Riley et al. 2003: 152.

Holotype. Examined , ♂ ( Fig 78 ) with the following labels and attachments: || Union Co., Ill. | Jun. 3 ’ 37 | 37-21148 || wild cherry | foliage | W. F. Turner | T-5048 || Xanthonia | HSB’ 37 sp. || ♂ || [glycerine-filled microvial containing male genitalia] || [red label] HOLOTYPE | XANTHONIA | FURCATA | Staines & Weisman ||. This specimen is dissected with the abdomen glued on the point and the male genitalia contained in a glycerine-filled microvial, all appendages intact. Conserved in USNM .

Diagnosis. Size medium, length 2.8–3.5 mm; dorsal ground color light to medium reddish brown with pattern of darker maculae ( Figs 3 , 78 ); venter of body dark brown to black; pubescence of elytra composed of reclined hairs on intervals in single rows and appressed hairs arising from punctures shorter than erect hairs; ventral tooth of profemur obsolete to absent; lateral margins of all ventrites entire; median lobe of male genitalia gradually tapered distally, apex with deep, acute v-shaped incision with acutely pointed lobe on each side ( Fig 74 ).

Range. Recorded from Illinois and Missouri ( Staines & Weisman 2001a). During the present study, specimens were recorded Texas and adjacent Oklahoma (Appendix 10). In Texas, X. furcata is known from the northeastern portion of the state ( Map 2 ).

Plant associations. The holotype is labeled as having been taken on wild cherry. There are no plant associations for the Texas material, but the collection records from Oklahoma are from oak.

Seasonal distribution. Collections in Texas and Oklahoma are from April and May.

Remarks. As with the preceding two species, this species can be tricky to identify without reference to the male genitalia, but its color pattern when well developed and its restricted range in Texas are helpful. The male genitalia with a deep and sharply defined v-shaped emargination and acute lateral lobes are highly diagnostic.

Specimens examined. See Appendix 10. The male genitalia of 14 males from 5 localities were examined.

Figures

FIGURES 1–9. Xanthonia species, dorsal habitus. 1) X. angulata (Bastrop Co., Texas); 2) X. dentata (Jeff Davis Co., Texas); 3) X. furcata (Wood Co., Texas); 4) X. nitida (Pecos Co., Texas); 5) X. parva (Kerr Co., Texas); 6) X. picturata (Robertson Co., Texas); 7) X. querci (Val Verde Co., Texas); 8) X. texana (Bandera Co., Texas); 9) X. villosula (Bossier Parish, Louisiana). Images to scale, scale bar = 1 mm.

FIGURES 64–75. Xanthonia species, en-face and lateral view of median lobe. 64) X. angulata (Washington, DC); 65–66) X. angulata (Mt. Vernon, Virginia); 67–68) (Bastrop State Park, Texas), 69); X. striata (Flatbush, New York); 70) X. striata (Nelson Co., Virginia); 71) X. striata (Wolfville, Maryland); 72–73) X. striata (Hanover, Pennsylvania); 74–75) X. furcata (Union Co., Illinois). All figures from Weisman (1960), except 67–68.

FIGURES 76–78. Xanthonia species, types and type labels. 76) X. texana; 77) X. querci; 78) X. furcata. Map 7. Distribution of Xanthonia texana.

MAPS 1–6. Distribution of Xanthonia species. 1) X. vagans; 2) X. furcata (■), X. marquai (♦), X. nitida (●); 3) X. hirsuta; 4) X. picturata; 5) X. angulata (♦), X. dentata (●), X. querci (■); 6) X. parva (■), X. villosula (●).