138 BKITISH BUTTERFLIES. 



abundantly supplied with the characteristic lenticles. The cremaster 

 is not, as a rule, well-developed, but the pupse are suspended by means 

 of an anal pad and central girth. Scudder notes that the larva of 

 Hydrops takes a comparatively long time, after spinning up, before 

 pupation, viz., from two to four days, and that the girth, which is 

 placed by the larva between the meso- and metathorax, then slips 

 backwards into the incision between the 1st and 2nd abdominal 

 segments. As with our species, the natural position for pupation is, 

 for most of the species, on the upper or under surface of a leaf. It is 

 remarkable how distinctly, in the resting-period preceding pupation, 

 the development of the pupa beneath the larval skin can be traced, the 

 separation of the thorax and abdomen, the wings, etc., all being 

 very clearly marked. 



Scudder gives the following detailed diagnosis of the tribe, under 

 the generic name Thecla [Butts, of New England, ii., pp. 868-870): — 



Imago. — Head small, densely clothed with scales, and above with short hairs ; 

 on the front, the hairs are exceedingly short and sparsely scattered. Front not at 

 all prominent, almost flat, barely surpassing the front of the eyes, slightly sunken 

 down the middle above, below very slightly tumid ; twice as high as broad 

 . . . . Eyes rather large and full, very sparsely and very briefly pilose, 

 excepting on the upper third. Antennas inserted with the hinder edge of their 

 bases just in front of the middle of the summit, and separated from each other by 

 three-quarters the width of the antennal pit ; about half as long again as the 

 abdomen, consisting of from 28 to 30 joints, of which from 11 to 14 form the 

 cylindrical club ; usually the latter is very gradually thickened, always but 

 slightly, being scarcely, twice as wide as the stalk ; . . . . the tip very bluntly 



rounded Palpi rather slender, fully half as long again as the eyes, the 



terminal joint about three-quarters the length of the penultimate and clothed with 

 recumbent scales, the other heavily clothed, especially beneath, with long scales 

 closely compressed in a vertical plane. Patagia exceedingly long and slender, 

 arched and very slightly convex, three or four times longer than broad .... 

 Forewings about half as long again as broad, the costal border pretty strongly 

 convex and almost bent on the basal fourth, the middle half straight, the apical 

 fourth very gently curved backward, the outer angle more than a right angle, 

 scarcely rounded .... Costal nervure terminating just beyond the tip of the 

 cell; subcostal nervure with three superior branches; the first arising at, or a little 

 beyond, the middle of the outer four-fifths of the cell ; the second midway, or a little 

 further, between this and the apex of the cell ( ? ), or less than one-third the 

 distance to the same ( c? ) ; the third at, or just beyond, the tip of the cell ( ? ), or 

 midway between the origin of the first, and the tip of the cell ( J ), the main stem 

 beyond the origin of the second branch either straight ( ? ), or strongly arcuate, 

 convexity downward, to a little beyond the tip of the cell, and then straight ( <? ) ; 

 cross-vein closing the cell transverse, very feebly developed, excepting next the main 

 subcostal nervure .... Hindwings with the costal margin rather full and 

 convex, a little straightened in the middle, curving backward roundly at the tip, 

 joining the curve of the outer margin, which is a little full at the middle subcostal 

 nervule, especially in the <? , but beyond that pretty regularly and broadly rounded, 

 more or less obscurely angulated at the lower median nervule, where there is always 

 a long and slender thread-like tail .... there is also a secondary very 

 slight projection at the tip of the middle median nervule ; the inner margin is 

 rather broadly convex, more strongly next the base, and just before the tip, 

 angularly, though but little, emarginate. Submedian nervure terminating on the 

 outer border, just by the anal angle ; internal nervure terminating beyond the 

 middle of the inner margin. Androconia slender, sublanceolate, about four times 

 as long as broad, subequal, but tapering slightly on apical half, the apex broadly 

 rounded, the stalk very long. Fore tibia? about three-quarters the length of the 

 hind tibiae ; the forelegs similarly developed in the two sexes, excepting at the 

 terminal tarsal joint, and, with the same exception and the nakedness of the tibial 

 spurs, resembling the other legs very closely ; fore tarsi but little shorter than the 

 tibiae, the last tarsal joint either developed as in the other legs ( ¥ ) ; or very small, 



