Syzeton arizonae n. sp.

(Figures 2g; 3g; 4a; 5g, q)

Etymology. This taxon is named after its geographic origin.

Type locality. United States: Arizona. Cochise County, Coronado National Forest, Chiricahua Mountains, 1 mi. N Rustler Park [31°54’53” N 109°16’07” W] .

Distribution. United States: Arizona.

Description. Body length. ♂ holotype: 1.50 mm. Body and appendages entirely orange-yellow.

Head (Figure 4a). Transverse, orange-yellow, slightly wider than pronotum. Frons relatively depressed (compared to S. belovi n. sp.). Palpi orange-yellow. Punctures sparse (spaces between punctures much wider than the puncture diameters), fine and shallow. Pubescence uniseriate, short, appressed, yellow, reclinate.

Eyes small, convex, bulging, separated from the posterior edge of the head in side view by a distance half the eye diameter. Eyes nearly round, their outline hardly modified near the antennal insertions, separated from each other by three eye diameters in front view (Figure 4a, double arrow).

Antennae. Filiform, thinner than in S. belovi n. sp., covered with thin and stout setae, 75% the length of elytra in the ♂ holotype, orange-yellow. Antennomeres 3–10 weakly conical, subquadrate, regularly thicker toward apex. Last antennomere twice as long as penultimate, rounded.

Pronotum. Transverse, oval-shaped, posterior and anterior angles hard to discern, sides convex and rounded. Surface densely and coarsely punctate, the space between punctures much smaller than the puncture diameters, punctures large, deep. Pubescence uniseriate, short, appressed, yellow.

Elytra. Length. ♂ holotype: 1.05 mm. Elongate (width/length ♂ holotype: 0.52), sides rounded, humeral angles well marked. Punctures dense, strong and deep, coarser than on the pronotum, space between punctures much smaller than the puncture diameters. Disc weakly but regularly convex. Pubescence uniseriate, short, appressed, yellow (Figure 5q).

Legs. Simple, inconspicuous, yellow. Foretibia of the ♂ holotype straight with an apical inward kink and an inner tooth. These are male-specific characters.

Aedeagus (Figure 3g). Elongate, straight, regularly thinner from base to apex. Apex briefly tapered, with a ventral sinuosity in lateral view. Dorsal side with two sinuosities in lateral view, and an elongated process protruding ventrally (contrary to S. belovi n. sp., Figure 3h).

Type material. United States. Arizona: Cochise County, Coronado National Forest, Chiricahua Mountains, 1 mile N Rustler Park, 21.VIII.2000, B. Rodriguez Velez leg. (1 ♂ holotype, TAMU) ; Cochise County, Sunnyside, (1780 m) [31°26’ N 110°24’ W], 20.VIII.1972, K. Stephan leg. (1 ♀ paratype, FSCA) ; Cochise County, Sunnyside, (1780 m) [31°26’ N 110°24’ W], 19.IX.1972, (1 ♀ paratype, FSCA; 1 ♂ paratype, NGPC) K. Stephan leg.