Mar. iSgg] DyAR : LiFE HiSTORY OF DiPHTHERA FaLLAX. 



EXPLANATION OF PLATE L 



Fig. I. Larva, stage I, enlarged. 



" 2. Horns of last stage, enlarged ; lateral horn above, subdorsal below. 



" 3. A single horn of stage I, enlarged (joint 3). 



" 4. Larva, stage IV, dorsal view. 



" 5. Pattern of dorsal marking, stage V. 



" 6. Mature larva, three-quarters view, enlarged. 



" 7. The same, front view. 



" 8. Skin sculpture, stage IV. 



" 9. Some of the spines enlarged. 



" 10. Moth of jVatada nasoni. 



LIFE-HISTORY OF DIPHTHERA FALLAX H.-S. 

 By Harrison G. Dyar. 



This larva possesses the characters of the Apatelae, having many- 

 haired warts. The warts degenerate during ontogeny, becoming 

 functionless. The nearest allies seem to be Polygra»imate hebraicum 

 and Harrisimemna trisignata. 



Egg. — Circular, much flattened, domed, about 48 ribs, diminish- 

 ing by confluence toward vertex, which is irregularly reticularly ribbed ; 

 ribs slightly fluted, the space smooth, finely punctate shagreened ; no 

 cross striae ; micropyle smooth. Waxy white, scarcely shiny, no 

 marks ; diameter, i mm. ; height, 2 mm. 



Stage I. — Head rounded, eye black, mouth brown, otherwise 

 translucent, colorless; width, .25 mm. Body translucent, slightly 

 whitish ; segments convex ; hairs white, spinulose, single, i to v pres- 

 ent, i slightly blackish except on joint 11 which looks paler; hairs 

 equal, quite distinct, iv above v ; no subprimaries ; feet normal. 



Stage II. — Head slightly bilobed, colorless; width. 4 mm., warts 

 almost in line transversely, iv nearly imperceptible ; all Avith central 

 hair and distinct crown of long hairs. Hairs pale, except the central 

 one of warts i and ii which are black. Translucent green from the 

 foot with faint traces of a white subdorsal line. 



Stage III. — Head whitish green; width .75 mm. Body some- 

 what flattened, especially behind ; head retracted at apex. Body 

 clear green with narrow white subdorsal line and a broken dorsal one. 

 Warts moderate, i and ii on joint 12 in a square ; iv behind the upper 

 edge of the spiracle, v just below, iv and v about equal, vi large. 

 Hairs quite numerous, short, pale and black mixed, spinulose. Later 

 all the warts are narrowly pale brown. Body narrowed behind. 



