Ichneumonologia brittannicaThe ichneumons of Great Britain; a descriptive account of the families, genera and species indigenous to the British islands, together with notes as to classifiation, localitites, habitats, host, etc . e is a raised mar-gin, which forms the lower edge of the occiputand extends on either side of the head to the lower extremity of thecheeks, known in its lower part as the genal costa. This costa is some-times nearly or quite straight, from level with the peduncle downwards,but at others is inflexed or obtusely angulated some distance from its from above, th
Ichneumonologia brittannicaThe ichneumons of Great Britain; a descriptive account of the families, genera and species indigenous to the British islands, together with notes as to classifiation, localitites, habitats, host, etc . e is a raised mar-gin, which forms the lower edge of the occiputand extends on either side of the head to the lower extremity of thecheeks, known in its lower part as the genal costa. This costa is some-times nearly or quite straight, from level with the peduncle downwards,but at others is inflexed or obtusely angulated some distance from its from above, the head varies greatly in length and breadth behindthe eyes, being ofen very short and narrow, occasionally as long as theeyes themselves appear from that position ; and, when inflated in such away as to be laterally broader than the eyes, it is said to be cheeks in the figure are normal. When so broad and verticallystraight as to form a right angle with the clypeus they are termed buccate ;occasionally they are so narrow that the head is triangular, viewed fromin front. A genal sulcus is sometimes present upon the disc of eithercheek, extending from the lower extremity of the eyes to the base of Details of the Head.—i, vertex ;2, ocelli ; 3, frons ; 4, antennalscrobes ; 5, insertion of anten-nae ; 6, face ; 7, clypeus ; 8,cheeks ; 9, labrum ; 10, mandi-bles ; II, ligula ; 12, maxillarypalpus ; 13, labial palpus ; 14,eyes; 15, orbits. INTRODUCTION. XXXV DETAILS OF THE METATHORAX. This figure represents a postero-dorsal view of the metathorax, thevarious areae of which, outUned by elevated costae, though not alwaysstable, form valuable characters for discrimination, especially in the twofirst sub-families, in which they are more fully developed. In this figure,I is the basal area, always very distinct in the Joppides and usually obsolete or wanting in the Ichneumonides ; 2 isthe areola (area superomedia), behindwhich, sloping downwards, is (3) thepost
Size: 1666px × 1499px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsects, bookyear1903
