The elements of insect anatomy The elements of insect anatomy : an outline for the use of students in entomological laboratories elementsofinsect00comst Year: 1916 113 insect wings there exists a type of branching which is very different from that of our hypothetical primitive type. An examination of Figure 5, which represents the latter, will show that in every case the forked veins are branched dichoto- mously, while in the many-veined wings the more character- istic type of branch- ing results in the formation of pecti- nate veins; this pectinate type of branching is well shown by the cubi
The elements of insect anatomy The elements of insect anatomy : an outline for the use of students in entomological laboratories elementsofinsect00comst Year: 1916 113 insect wings there exists a type of branching which is very different from that of our hypothetical primitive type. An examination of Figure 5, which represents the latter, will show that in every case the forked veins are branched dichoto- mously, while in the many-veined wings the more character- istic type of branch- ing results in the formation of pecti- nate veins; this pectinate type of branching is well shown by the cubi- tus in a cockroach (Fig. 10 Cu). The changes that take place in the development of the pectinate type of venation from the dichotomous type are of two kinds : first, the develop- ment of accessory veins ; second, the modification of the primitive veins so that they are no longer dichotomously branched. The former has been dis- cussed above ; we will now briefly refer to the latter. For this purpose we will give a series of diagrams illustrating Fig. II.—Diagrams of several types of radius.
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