Triarius trivittatus ( Horn, 1893 )

Clark, Shawn M. & Anderson, E. Russell, 2019, A Review of Triarius Jacoby, 1887 (Coleoptera: Chrysomelidae: Galerucinae: Luperini), with Descriptions of a New Genus and Four New Species, The Coleopterists Bulletin 73 (2), pp. 343-357 : 356

Triarius trivittatus ( Horn, 1893) Figs. 2c , 3e

Triarius trivittatus Horn 1893: 88

Diagnosis. The tarsal claws of this species are bifid. Also, each elytron is yellow, with a sutural dark stripe ( Fig. 2c ), a posthumeral dark stripe, and a dark, short, oblique, median, subbasal stripe. Taken together, these characters distinguish this from all other New World species of Scelidites. Specimens measure 4.0– 7.1 mm in length.

Type Material Examined. We located four specimens from the type series in the Horn Collection ( MCZ). One of them, a male, bears the label “ LectoType 3796.” However, it is not clear who added the lectotype label to the specimen, and, to our knowledge, a lectotype designation has never been published. In any case, this specimen is now designated as the lectotype for T. trivittatus .

Type Locality. “ Arizona, Pinal Mountains .”

Geographic Distribution. We examined specimens from Cochise, Gila, Graham, and Pima Counties in Arizona. Although we have not seen specimens, this species is also reported from California ( Wilcox 1965).

Temporal Distribution. We eamined adults collected from April to June.

Plant Associations. This species is reported from Nolina and the flowers of a yellow composite ( Asteraceae ) ( Wilcox 1965; Clark et al. 2004). Included in the material we examined, there are specimens labeled as from the flowers of Nolina .

Comments. In addition to the type series, we examined 150 other specimens.

Figures

Fig. 2. Triarius species, dorsal habitus. A) T. pini, male, B) T. pini, female, C) T. trivittatus, D) T. nigroflavus, male, E) T. nigroflavus, female, F) T. melanolomatus, G) T. lividus, H) T. texanus, I) T. novoleonis.

Fig. 3. Triarius species, aedeagi, dorsal and lateral views. A) T. pini, B) T. nigroflavus, C) T. melanolomatus, D) T. lividus, E) T. trivittatus, F) T. texanus, G) T. novoleonis.