. Bulletin of entomological research. Entomology. Fig. 12. Siphon of larva. do not reach the external valves, each tracheal opening being protected by a cup- shaped valve, one being opposed to the other, so that when drawn together their rims meet and completely close the tracheae (fig. 12). Along the lower inner edge of each valve where attached to the trachea is a ridge bearing numerous short and delicate hairs (fig. 13).. Fig. 13. An internal tracheal valve of larva. Anal plate confined to the distal two-thirds of the anal segment and extending on each side to the median line (fig. 11) ; an
. Bulletin of entomological research. Entomology. Fig. 12. Siphon of larva. do not reach the external valves, each tracheal opening being protected by a cup- shaped valve, one being opposed to the other, so that when drawn together their rims meet and completely close the tracheae (fig. 12). Along the lower inner edge of each valve where attached to the trachea is a ridge bearing numerous short and delicate hairs (fig. 13).. Fig. 13. An internal tracheal valve of larva. Anal plate confined to the distal two-thirds of the anal segment and extending on each side to the median line (fig. 11) ; an inconspicuous bristle arises from anal plate on one side. Hair-tufts on dorsal angle of anal segment consisting of a pair of long straight hairs and a single tuft of somewhat shorter ones. Anal sills absent and represented by three short tubercles capable of being retracted (fig. 11). Ventral fringe well developed, consisting of several tufts of very long hairs. Comb of eighth segment triangular, the spines strong and stout, those at the apex large and conspicuous but very short at the base ; the vestiture of this segment as in accompanying diagram (fig. 11). Head pendulous, transversely ovate from above, narrower than the thorax, opaque ; mouth-brushes golden. Antennae apparently single-jointed, bare, except for the short terminal hairs (fig. 14). Clypeus slightly sinuated and armed with a pair of straight spines. Labrum cuneiform, its apex extending beyond the chitinous processes of the mouth-brushes ; its surface clothed with bristle-like hairs, while near its base in front of the clypeus is a small hair-tuft ; at the apex dorsally is a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Great Britain. Colonial Office. Entomological Research Committee; Imperial Institute of Entomology; Commonwealth Institut
Size: 1720px × 1453px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
