Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . rocephalic lobes, or anten-nal segment,) besides the antenna? (as) , bears three pairs of shorttubercles, which are the rudiments of the mandibles, maxilla?,and labium or second maxillae. Behind the mouth-parts arisesix long slender tubercles forming the rudimentary legs, whilethe primitive streak rudely marks out the ventral walls of thethorax and abdomen. Fig. 658 represents the head and mouth-parts of the embryo of the same louse ; vk is the f
Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farm-schools, and agriculturists . rocephalic lobes, or anten-nal segment,) besides the antenna? (as) , bears three pairs of shorttubercles, which are the rudiments of the mandibles, maxilla?,and labium or second maxillae. Behind the mouth-parts arisesix long slender tubercles forming the rudimentary legs, whilethe primitive streak rudely marks out the ventral walls of thethorax and abdomen. Fig. 658 represents the head and mouth-parts of the embryo of the same louse ; vk is the forehead, orclypeus ; ant, the antenna? ; mad, the mandibles ; max1, the firstpair of maxillae, and max-, the second pair of maxilla?, orlabium. Fig. 659 represents the mouth-parts of the sameinsect a little farther advanced, with the jaws and labiumelongated and closely folded together. Fig. 660 represents thesame still farther advanced ; the mandibles are sharp, andresemble the jaws of the Mallophaga or biting lice ; and themaxilla (max1) and labium (ma or) are still large, while after-wards the labium becomes nearly obsolete. Fig. 661 repre-. Embryo of louse. 708 APPENDIX. Fig. r,5)-. Fi-. 661.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishe, booksubjectinsects
