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Short but very informational article on this lady beetle's life cycle and prey. Includes descriptions of all larval instars, dorsal illustrations of first and fourth instars, and illustration of fourth instar head.

Full citation, with entire title:

Akbar, W., C. Carlton, and T. E. Reagan. "Life Cycle and Larval Morphology of Diomus terminatus (Coleoptera: Coccinellidae) and Its Potential as a Biological Control Agent of Melanaphis sacchari (Hemiptera: Aphididae)." Annals of the Entomological Society of America 102(1): 96-103 (2009).

Link goes to a PDF file, which can be viewed in the free Adobe Acrobat program.
http://www.entomology.lsu.edu/lsam/intro/labpubs_files/Diomus_terminatus_Annals_2009.pdf