89. Limnogonus luctuosus (Montrouzier) .

Gerris luctuosa Montrouzier, Soc. Linn. Lyon, Ann. (n. s.) 11: 242, 1864.

Three macropterous females, Agana Swamp, May 4, Usinger . These are slightly smaller, 7.75 mm., than female examples from Tahiti and have the yellow lateral lines of the sides of the mesothorax as in Lundblad's figure 2, b (B. P. Bishop Mus., Bull. 113: 124, 1934), but not constricted near the middle and with the truncated end connected at its upper angle to an additional pale spot behind the black-rimmed spiracular slit. In other respects these Guam specimens agree with Lundblad's revised description (Arch. Hydrobiol., Suppl. 12:380, 1933). Known elsewhere from New Caledonia, New Hebrides, Samoa, Tahiti, Raiatea, Murray, and Caroline Islands.