Insemination in the migratory grasshopper, Melanoplus sanguinipes (Fabr.)

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Abstract
Insemination in Melanoplus sanguinipes takes place by means of a small, relatively simple, tubular spermatophore which begins to form in the ejaculatory duct almost immediately after a pair is securely coupled. It takes about 5 min to complete the process of forming the spermatophore in the ejaculatory duct, extruding it into the spermathecal duct and ejecting it from the spermathecal duct and aedeagus following sperm transfer. During extrusion the tube penetrates only a short distance into the wide bend of the spermathecal duct at which point the seminal fluid is discharged. The entire spermatophore is then withdrawn and becomes lodged between the valvulae of the female. As many as 14 spermatophores are produced consecutively during a single copulation. The situation in M. sanguinipes is discussed in relation to the information available on other acridids.

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