152 BRITISH BUTTERFLIES. 



It would appear that Scudder's diagnosis of the genus Rustic us 

 (Butts. New Engl., ii., pp. 957 et seq.) covers the whole tribe, and that 

 it is really a description of our Plebeiidi. It reads as follows : 



Imago : Head small, densely covered with scales, which form a tuft behind the 

 antennae ; provided also sparsely on the upper half of the front, with short, curving, 

 erect hairs. Front flat, very slightly tumid beneath, scarcely surpassing the front 

 of the eyes ; above hollowed in the middle, with a broad longitudinal grooA r e ; 

 scarcely half as high again as broad, fully as broad as the eyes ; the sides parallel, 

 the upper border squarely excised, its angles rather largely hollowed in front of 

 the antenna? ; lower border strongly rounded. Vertex not tumid, well rounded 

 longitudinally, rather suddenly and broadly elevated behind the antennae, as their 

 support ; separated from the occiput by a not very distinct, because tortuous, 

 broad, and not very deep transverse channel, the sides of which, about equally 

 abrupt, form a right angle with each other ; occiput longitudinally excised in the 

 middle. Eyes not very large nor full, entirely naked. Antennae inserted rather in 

 advance of the middle of the summit, separated by a space barely equalling the 

 diameter of the first joint, scarcely longer than the abdomen, composed of about 

 thirty-two joints, of which the last twelve or thirteen form the club, which is nearly 

 three times broader than the stalk, four or five times longer than broad, very 

 gradually increasing in diameter, the last two joints forming the bluntly-rounded 

 tip. Palpi slender, compressed, nearly, if not quite, twice as long as the eye, the 

 terminal joint very slender, scarcely more than one-third as long as the middle 

 joint, and clothed only with recumbent scales; other joints heavily scaled, and also 

 thinly fringed with rather long, for ward- reaching, erect, coarse hairs, narrowly 

 compressed in a vertical plain. Patagia scarcely tumid, a little arched, slender, 

 about two-and-a-half times longer than broad, the inner border considerably curved, 

 the outer bent, tapering considerably, but the apical two-fifths equal, moderately 

 slender, bent a very little outward, and bluntly rounded at tip. Forewing fully 

 three-fourths as long again as broad, the costal margin strongly, and rather abruptly, 

 convex at base, beyond nearly straight, scarcely convex, the extreme tip sloping 

 downward; outer margin rather strongty and regularly convex, its general direction 

 at an angle of about 55° with the middle of the costal border, the upper angle 

 abrupt but rounded, the lower well-rounded off ; inner margin straight. Costal 

 nervure terminating a little before the tip of the cell; subcostal with three superior 

 branches ; first arising a little beyond the middle of the cell, second at nearly one- 

 third the distance from this to the apex of the cell, the third as in Nomiades, but 

 forking before the middle of its course; veins closing the cell excessively feeble 

 throughout, bent at a slight angle ; cell somewhat more than half as long as the 

 wing, and fully four times as long as broad. Ilindwings with the costal margin a 

 little convex on the basal third, beyond scarcely convex, the outer margin well- 

 rounded, fullest in the anterior half, and especially in the ? , the inner border a 

 little convex, the apical half slightly excised, the angle very broad, rounded off. 

 Submedian nervure terminating at the anal angle; internal nervure terminating a 

 little beyond the middle of the inner border. Androcouia flattened, oval in shape, 

 almost alike at the two ends, the pedicel scarcely tapering. Fore tibiae a little 

 more than five-eighths the length of the hind tibiae, the tarsi either scarcely ( cf ), or 

 nearly one-third (?) longer than the tibise, but tibia- and tarsi combined, about 

 equal in the two sexes ; apical appendages of the last tarsal joint either like those 

 of the other legs ( ? ), or the claws connate, forming a single conical, appressed 

 hook, broad at the base, scarcely curving, longer than normal, and the paronychia 

 and pulvillus wanting (J ); in other respects the forelegs do not differ materially in 

 structure from the other legs, but they are shorter, not quite so crowded with spines, 

 those of the tibiae being very few and scattered, and the tibial spurs, although not 

 small, are naked. Middle tibiae scarcely four-fifths the length of the hind tibiae, 

 and armed beneath with a double row of short, very distant, delicate spines, and at 

 the tip with a pair of not very long, scaly spurs. First joint of tarsi nearly 

 equalling all the rest combined, the second, third, and fourth diminishing regularly, 

 the fifth scarcely so long as tin 1 second, all furnished beneath with a mass of long 

 and slender, crowded, tapering spines, mostly confined to two rows beyond the 

 basal joint, the apical ones of each joint Longer, spur-like ; claws small, moderately 

 slender, rather strongly, but not regularly, curved, being bent before the middle, 

 and slightly hooked at tin- tip, tapering, finely pointed, and having at the base a 

 Large, rounded, slightly produced, compressed lobe; paronychia double, the 



