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.

    7/160 page 165
    _ The nomenclature of the head is similar to that given by Forbes (1910), and the few cephalic setae used in this paper are numbered in figs. 36, 38. Forbes’ system of nomenclature is adopted only for the purposes of this paper, a better nomenclature and one now generally in use by the few workers who use the setal characters is explained by Heinrich (1916). The ocelli are numbered as shown in fig. 7, and the parts of the head are named as shown in fig. 36. The crochets of the prolegs of the species dealt with in this paper are arranged in a complete circle (fig. 3), a penellipse (fig. 86), or a mesoseries (fig. 4) and may be uniordinal (fig. 4), biordinal (fig. 3), or triordinal (fig. 5). In order to save space in the descriptions of families. and species Roman numerals are used to designate the segments of the body behind the head ; _ I, I, II for the thorax and 1, 2, 3, 4, &c., for the abdomen. Figs. 1-5. (1) Dorsal view of prothorax and mesothorax and first and ninth abdominal segments. (2) Lateral diagrammatic view of same segments. (3) Biordinal crochets ' arranged in a complete circle. (4) Uniordinal crochets arranged in a mesoseries. (5) Triordinal crochets. Lines next to figures refer to a length of 0-20 mm. unless otherwise indicated. All illustrations accompanied by an indication of magnification have been drawn with the aid of a camera lucida. Key to the Larvae of the Moths associated with Stored Products, 1. Prolegs short, narrow, and often very indistinct and each with only two crochets (Thoracic legs small. Body 7 mm. long or less. Always inside grain except in first instar). Cosmopolitan. (GELECHIIDAE, part)...Sztotroga cerealella, Oliv. | Prolegs distinct and well developed and each proleg always with many GUO Oh te Oh, cu tteVu sce nd sok kn dens oa tacenenedReael hi tedscayces EMER TREE Cane Douce 2 (1594) 3 | , Ag
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