C. V.  Riley and Howard, L. O., ?Mr. Craw on the destructive insects of California?, Insect Life, vol. 4, pp. 167-168, 1891.

L. O.  Howard, ?The hymenopterous parasites of the California red scale?, Insect Life, vol. 6, pp. 227-236, 1894.

L. O.  Howard, ?Two parasites of important scale-insects?, Insect Life, vol. 7, p. 5-Aug, 1894.

L. O.  Howard, ?On the parasites of Diaspis pentagona ?, Entomological News, vol. 17, pp. 291-293, 1906.

L. O.  Howard, ?On the parasites of Diaspis pentagona ?, Redia, vol. 3, pp. 389-392, 1906.

L. O.  Howard, ?A key to the species of Prospaltella , with a table of hosts, and descriptions of four new species?, Annals of the Entomological Society of America, vol. 1, pp. 281-284, 1908.

L. O.  Howard, ?On two new species of parasites of Aleyrodidae?, Proceedings of the Entomological Society of Washington, vol. 10, pp. 63-65, 1908.

L. O.  Howard, ?A note on the Indian enemies of Aleyrodes citri R. and H., with description of a new species of Prospaltella ?, Journal of Economic Entomology, vol. 4, pp. 130-132, 1911.

L. O.  Howard and Ashmead, W. H., ?On some reared parasitic hymenopterous insects from Ceylon?, Proceedings of the United States National Museum, vol. 18, pp. 633-648, 1896.