November 1892.] 



PSYCHE. 



351 



PREPARATORY STAGES OF PHEOSIA PORTLANDIA Hv. Edw. 



BY HARRISON G. DYAR, BOSTON, MASS. 



Pheosia portlandia Edwards. 

 1SS6.— Hv. Edw., Ent. amer., ii, 16S, 

 Pheosia. 



1891. — Smith, List lep., No. 12S7. 

 descherei Neuvnoegen. 



1892. — Neum., Can. ent., xxiv, 227, Noto- 

 donta. 



Egg. — Hemispherical, the base flat; not 

 shining, whitish green; diameter 1.2 mm. 

 Under the microscope it appears densely 

 covered with minute white granulations, 

 except at the micropyle, where is a single 

 larger granulation, surrounded by a pale 

 green ring, from which the granulations are 

 absent. The granulations are larger in the 

 area immediately around the micropyle, and 

 diminish in size towards the base of the egg, 

 becoming very minute and almost lost on the 

 under side. The larva hatches by eating a 

 semicircular hole in the side of the egg, 

 leaving the rest of the shell. Eggs laid 

 singly on the leaves. 



First stage. — Head slightly bilobed, black 

 and shining; labrum paler, slightly whitish; 

 a few pale hairs; width 0.65 mm. Joint 12 

 is hardly perceptibly enlarged dorsally; body 

 cylindrical, diminishing a little in size pos- 

 teriorly; no traces of a caudal horn; feet 

 normal, the anal pair used in walking. Color 

 pale white, cervical shield and thoracic feet 

 black, abdominal feet, except the last pair, 

 blackish outwardly; setiferous dots con- 

 colorous, the setae pale, short. As the stage 

 advances the anal plate, all the abdominal 

 feet outwardly and the piliferous dots become 

 black. The dots are large and distinct, row 

 1 on joints 5-12 almost in line with row 2 

 except that on joint 12 there is a single large 

 dorsal dot instead of row 1 but it bears two 

 setae ; row 3 lateral ; rows 4 and 5 subventral, 

 smaller. Joint 12 becomes more enlarged, 



but there is still no horn, till just at the end 

 of the stage a purplish shade appears about 

 the dorsal dot. A row of subventral purplish 

 spots appears and the body becomes greenish. 

 Second stage. — Head hardly bilobed, 

 rounded, narrowing a little to vertex; smooth 

 shining pale brownish, vertices of lobes 

 nearly black, labrum whitish, jaws and ocelli 

 black; width 1 .0 mm. Body slender, cylin- 

 drical, with a short, rounded, conical process 

 on joint 12 dorsally, bearing the two setae of 

 row 1 almost at its vertex; other setae fine, 

 blackish, situated as before, their bases very 

 slightly elevated but not discolored. Body 

 pale whitish green, thoracic feet blackish 

 with a dark red subventral line along their 

 bases, represented by small spots above the 

 abdominal feet. Process on joint 12 faintly 

 purplish. Cervical shield and anal plate not 

 distinguishable. Later a yellowish shade 

 appears substigmatally, the subventral band 

 below it is purplish, broken, occurring on the 

 bases of the legs. Abdominal feet green, 

 tinged with purplish on the outside. 



Third stage. — Head rounded, and narrow- 

 ing a little above, very slightly bilobed, 

 flattened in front so that the lateral outline is 

 nearly triangular; straw yellow, not shining, 

 ocelli and jaws inwardly brown, labrum 

 whitish; width 1.6 mm. Body cylindrical, 

 joint 12 enlarged and bearing a fleshy process 

 in the shape of a horn, 0.4 mm. long and 

 directed straight upward. Setae short, pale, 

 row 1 on joint 12 diverging from the horn 

 before its tip, their concolorous bases slightly 

 elevated and, under a lens, with a minute 

 black dot. Color uniform pale green, yel- 

 lowish at the sides with an interrupted 

 purplish red band along the bases of the 

 legs, most well developed on the thoracic 

 segments. Spiracles black, narrowly paler 



