IR-604 Insect Sex Separator. While several genetic and transgenic approaches have been developed that allow male-female separation for some insect species, separation based on sexual size dimorphism remains a useful technique in the laboratory. and in mass rearing facilities to eliminate female pupae. In addition, research often requires the separation of different larval developmental stages. The IR-604 size-based pupal sex separator system, based on the classic larval-pupal separator (narrowing glass plates, Fay-Morlan glass plate separator), is an advanced tool for entomologists. It provides a more convenient and efficient entry and sorting/collection mechanism, and has three levels of separation - allowing for more accurate fractionation of populations with some overlap between larval or pupal sizes (e.g., small female and large male pupae). See pdf document for details/specifications of VSI IR-604 Pupae Sex Separator and a brief manual.