THE CANADIAN ENTOMOLOGIST. 307 



ON THE LARV.^ OF TWO SPECIES OF ARACHNIS. 



BY HARRISON G. DYAR, NEW YORK. 



The larvee of two species of Arachnis, from Mexico, were given to 

 me by Mr. Jacob Doll. They are the following : — 

 Arachnis aulea, Geyer. 



Egg. — Shape of two-thirds of a sphere, with flat base. Shining, 

 pearly, iridescent. Diameter, .6 mm. The reticulations are rounded, 

 moderately distinct, of quite uniform size, but smaller at apex. On the 

 angles of the reticulations a series of short, stiff spines (^inch objective). 



First stage. — Head bilobed, the lobes full, rounded ; clypeus large, 

 mouth projecting. Colour shining, blackish, ocelli black, mouth brown ; 

 width, .3 mm. Body, pale whitish-brown, shading into a milky colour 

 dorsally. Warts small, black, hairs single from i. and ii. on joints 5-12, 

 several from a wart on the others, pointed and very minutely spinulose. 

 Cervical shield, thoracic feet and the abdominal ones outwardly, black. 



Second stage. — Hairs more numerous, several from each wart, black, 

 bristly. Width of head, .4 mm., colour shiaing black. Body pale choco- 

 late-brown, with a diffuse darker sub-dorsal band, and very faint narrow, 

 pale dorsal line. Warts black. 



Third stage. — Head shining black; width, .6 mm. Body dark black- 

 ish-brown, with a flesh-coloured, narrow, dorsal line. Warts black ; hairs 

 of different lengths, stiff, more abundant at the extremities than centrally, 

 with a few long, white ones anteriorly. Slight white lines above warts iii. 

 and iv. 



Fourth stage. — -Dorsal space on joints 6-10 marked with brick-red 

 around wart i.; dorsal line very narrow, pale ; lateral white lines obscure. 

 Hair on joints 25 and 1 1-12, more abundant and longer than centrally ; 

 black, the subventral hairs white. Width of head, .9 mm. 



Fifth stage. — Head rather square, black; width, 1.2 mm. Body aU 

 black, with a narrow red dorsal line. Warts and thoracic feet shining. 

 Hair black at ends, foxy-red centrally, the long anterior and posterior 

 hair and most of the subventral ones pale, nearly white. 



Sixth stage. — Head as before; width, r.g mm. Body black, im- 

 maculate, the warts shining ; abdominal feet light reddish. Hair bristly, 

 pointed, foxy-red, mixed wiih black, with a few long and pale ; subven- 

 tral hair indistinctly paler than the rest. Spiracles small, white. 



