IIKSPEIUDI: TIIANAOS PERSIUS. 1471 



simplo, or two-proiigeil, the cover-scales i,3 f) always rouiuled but of very varying 

 shapes. 



Eggv66 : 11). Usually furnished wltli eleven or twelve, sometimes with as many as 

 fourteen, rarely with as few as ten, vertical ribs, rnnning in a nearly straiglit course 

 from the base to the edge of the summit, there or above united so that only a few 

 more than half the number border the micropylic depression; they increase very 

 slightly and gradually in size from the base to the shoulder of the egg, where they 

 are much elevated and slightly overarch the micropylic depression ; the space between 

 the ribs is traversed by cross lines of which there are about twenty-five between the 

 base and the shoulder of the egg; they are very delicate and equal, slightly further 

 apart above than on the sides of the egg; where they traverse the ril)s they slightly 

 thicken the latter, giving them a beaded appearance ; the micropylic depression (69 : 1) 

 is scarcely wider than the greatest width between the vei'tical ribs. Color of egg 

 pale yellowish green, the ribs, especially where the cross lines strike them, being 

 brownish or golden brown ; changing in about two days, first to a pale, afterwards to 

 a deeper, salmon color whicli later becomes blood red or claret red, the vertical ribs 

 showing a dark golden amber. Width of egg, .84 mm. 



The egg differs decidedly from tliat of P. lucilins in the cousiderably greater eleva- 

 tion of vertical ribs at the shoulder and in that those which are continuous throughout 

 are mostly straight from bottom to top. 



Caterpillar. Firft stage. Head (80: 37) orbicular, very slightly cordiform, scarcely 

 broader than the middle of body, piceous, minutely granulate with scattered, short, 

 stout, white or colorless hairs; mouth parts dark castaueous. Body very pale green 

 withaslightly brownish yellow tinge. Legs and prolegs concolorous, the claws of the 

 former pale testaceous ; the skin delicately and rather sparsely punctate. Length at 

 birth. 2.5 mm. ; when full grown. ."> mm. ; breadth at birth, .3 mm. ; when full grown 

 .7 mm. 



Second stage. Head(80:3S) black, with a dull luteous tinge in front, subquadrate 

 with angularly emargiuate summit, full rounded sides, rather profusely covered with 

 minute granules, giving rise each to a short, white hair, nest the neck shining luteous; 

 mouth parts color of head ; antennae and ocelli piceous. Body pale yellowish green, 

 profusely dotted with pale warts, each giving rise to a short, fungiform hair of same 

 color ; these warts are more or less definitely arranged but only along the lateral line 

 form a series so close as to give the effect of a pale stripe, about five dots being here 

 found on each segment in a row. Prothoracic shield of the color of rest of body. 

 Legs and prolegs color of body, the claws of former scarcely infuscated. Spiracles 

 pale luteous, very inconspicuous. Length, i mm. 



Fourth stage. Head (80: 39) black, sonjetimes obscurely mottled with ferruginous 

 brown, with fine, short, inconspicuous, white hairs. Body pale green, sprinkled pro- 

 fusely with raised, white dots from each of which springs a very short, white bristle 

 which, at least on the sides, is short, wine-glass shaped; a slender, darker green, 

 mediodorsal line and slender but variable, pale yellowish white, lateral lines ; spiracles 

 legs and prolegs concolorous. Length of body, 8.5 mm. ; breadth, l.-l mm. 



Last stage (77:7, 15). Head (80:40) mostly ferruginous brown with pale, incon- 

 spicuous, vertical streaks through it; or, the triangle and broad, ovate patches on 

 either side occupying most of the face are ferruginous brown and are separated by 

 dark or blackish streaks ; l)Ut at other times it is pale yellowish brown with vertical, 

 broad stripes in which the tubercles are darker or very dull ferruginous, in the middle 

 of the summit and extending a little way down the front ; the back of the head and the 

 lower parts of the sides black or blackish. Or, again, the whole head may be piceous 

 with ferruginous or luteo-ferrugiuous, small spots and narrow stripes ; in particular 

 the triangle may be enlivened with this color both below and above, and in the centre of 

 each hemisphere, while slightly converging vertical stre.aks between the central spots 

 and the median suture fall from tlie summit of each liemisphere; so also a dot of the 

 same color may be found on either side a little beyond the base of the triangle and the 

 epistoma may be more or less tinged with it; sutures rather broadly and obscurely 



