. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 580 Dr. D. Keilin on the with 4 pairs of sensory circular papillae, followed by 3 pairs of ordinary sensory hairs, one pair of pectinate hairs, one pair of short conical papillse, one single median transparent papilla^ and, finally, a median soft protuberance covered with short chitinous hairs. Viewed by transparency the labrum shows also a strongly chitinized structure, which serves for the attachment of the labral muscles. The maxiUcB (PI. XIX. fig. 3) are very flattened and
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 580 Dr. D. Keilin on the with 4 pairs of sensory circular papillae, followed by 3 pairs of ordinary sensory hairs, one pair of pectinate hairs, one pair of short conical papillse, one single median transparent papilla^ and, finally, a median soft protuberance covered with short chitinous hairs. Viewed by transparency the labrum shows also a strongly chitinized structure, which serves for the attachment of the labral muscles. The maxiUcB (PI. XIX. fig. 3) are very flattened and reduced almost to a group of sensory organs, comprising [a) a cir- cular papilla, {b) a sensory hair, (c) a pit with 3 to 4 cylin- drical papillae, followed by (d) an ordinary circular papillse and {e) a protrusihle vesicle bearing 3 to 4 small papillae. The mamUhles (text-fig. 2, A, and PI. XIX. fig. ],m.) are very strongly chitinized and ])rovided with 4 teeth, 3 of which are clearly visil)le from the side. The labium (text-fig. 3) has the form of a chitinous plate ending in 17 to 19 teeth. Text-f]ff. Basyheka ohscura: labium of thje larva, seen veutrally. The hyjjopharynx is very mcII seen by transmitted light as a very dark transverse chitinous sclerite occupying the central portion of the head capsule (PI. XIX. fig. 1, A.). Its structure is much more complicated than was described by Goetghebuer (1914, p. 183, pi. ii. fig. 2) in a closely-allied species of Dasyheha. It does not form one solid chitinous plate as represented by this author, but is composed of the following four independent sclerites (PI. XIX. figs. Qh7^ :— (1) A ventral triangular plate {v.) with its lateral edges strongly chitinized and showing two ventral projections : one near the base of the triangle and another near the anterior angle of it, against the opening of the common duct (s.) of the salivary glands. The basal portion of the ventral sclerite forms a striated' ridge (?*.) from which origin
Size: 2913px × 858px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookce, booksubjectbotany, booksubjectgeology, booksubjectzoology
