(Fig. 64, 67, 74-75, 120-121, 130)

Rondonian males of N. solon (mean FW length = 29.0 mm [28.1-30.6, n = 10)] vary on the dorsum from olive to yellow-olive and in the width of the dark band on the ventral hindwing that may be partially separate from the dark brown margin or fully incorporated within it. Medial markings on that wing are absent or, usually, as vague dark macules in Sc+R 1 -Rs and occasionally in the discal cell. The pale macules in cells M 1 -M 2 and M 2 -M 3 on the forewing are variably present; the latter or both may be absent. The small macule in the upper part of cell CuA 2 -2A is also often absent. The single female seen from Rondônia (FW length = 36.1 mm) has five subapical macules on the forewing as is apparently typical of this subspecies (Evans 1952). The dorsum of this female is virtually identical to that of the female of N. broteas from Rondônia except for the number of subapical macules (N. broteas has four). The forewing of N. solon is more pointed (less rounded). The venter is also similar to that of N. broteas, but the discal band is not completely separated from the dark margin as it is on N. broteas.

The genitalia of Rondonian males of N. solon (Fig. 120) are as illustrated for this species by Williams and Bell (1934, as N. broteas) and Evans (1952). The genitalia of the single female from Rondônia (Fig. 121) have a quadrate lamella postvaginalis with a narrow and shallow V-shaped central indentation. The central portion of the lamella antevaginalis is short with a pair of broad and pointed lateral lobes. Both male and female genitalia are identical to those of Nascus solon corilla Evans, 1952, from Costa Rica (pers. obs.).

Nascus solon is common in central Rondônia, with records for May through August and October through December; most records are in the early wet season (Fig. 130). The species has been reported from southern Mexico south into the immediate Amazonian drainage of Brazil and Peru (Hoffmann 1941, Evans 1952, de la Maza and de la Maza 1985, Lamas 1994, Warren 2000, Luis et al. 2004).