Insect pests of food.

  • Great Britain. Ministry of Food.
Date:
1943]
Catalogue details

Licence: Public Domain Mark

Credit: Insect pests of food. Source: Wellcome Collection.

    32/160 (page 190)
    This species is closely related to Acrobasts caryae from which it may be distinguished as shown under the heading of A. caryae, Both species of Acrobasis differ from all other Pyralids considered in this paper by having the two ventral spines of the maxillary mala forked at apex. The above description is based on rottr apparently mature larvae preserved in alcohol. These larvae were determined as A. juglandis by Dr. C. Heinrich. Figs. 40-43. Acvobasis caryae, Grote.—(40) Ocellar region. (41) Head. (42) Prothorax. (43) Maxillary mala from dorsal view. Mature Larvaw—Length, 17._mm.; breadth, 2 mm. Cuticle (of specimens preserved in spirit) moderately pale yellow-brown or grey-brown; head reddish- brown and other sclerotised parts of cuticle pale yellowish-brown except peritreme of spiracles which is very dark brown. According to Forbes (1923) living larvae are “‘...:greenish gray, with dark brown head, shining yellow-green cervical shield, and light brown subdorsal plate on mesothorax.’”’ Structurally very similar to Acrobasis juglandis (Le Baron) but differing principally as follows: (1) head (fig. 41) with seta i no nearer than ii to’ puncture between them; (2) prothorax