. Bulletin - United States National Museum. Science. 240 BULLETIN 18 2, UNITED STATES NATIONAL MUSEUM hypomera sometimes feebly lobed behind the coxae; anterior coxal cavities entirely open behind, confluent; front coxae large, exserted; middle coxal cavities confluent; posterior coxae contiguous, coni- cal; first and second abdominal sternites absent; seventh st^ernite of male sometimes slightly emarginate and with a ctenidium along pos- terior margin; eighth sternite of male Figure 1.—Apical abdominal sternites of males of Lithockaris: A, L. dorsalis Erichsonj B, L. secunda, new
. Bulletin - United States National Museum. Science. 240 BULLETIN 18 2, UNITED STATES NATIONAL MUSEUM hypomera sometimes feebly lobed behind the coxae; anterior coxal cavities entirely open behind, confluent; front coxae large, exserted; middle coxal cavities confluent; posterior coxae contiguous, coni- cal; first and second abdominal sternites absent; seventh st^ernite of male sometimes slightly emarginate and with a ctenidium along pos- terior margin; eighth sternite of male Figure 1.—Apical abdominal sternites of males of Lithockaris: A, L. dorsalis Erichsonj B, L. secunda, new species; C, L. ochracea (Gravenhorst); D, L. sororcula Kraatz, Remar'ks.—This genus has been a source of difficulty for many years and has been given very different status by various writers. Casey separated it as a subtribe distinct from Medon and most other writers have considered it to be a subgenus of Medon. In my revi- sion of the Paederini (Blackwelder, 1939) I endeavored to separate these two as valid genera and assigned several subgenera to each. The genotype of Lithocharis is nearly cosmopolitan, but the generic char- acters are not pronounced or obvious. I assign nine AVest Indian species to this genus, three of them new. Of these, five belong in the typical subgenus, three in the sub- genus Stilocharis, and one in the subgenus Ophiomedon. The sub- genus Pseudomedon is apparently not represented in the West Indies. I have examined 653 examples of this genus from the West Indies. Of these, 270 arc in the British Museum, 35 in Dr. Cameron's collec- tion, 40 in the United States National Museum, and over 300 col- lected by me in 1935-37. KEY TO WEST INDIAN SPECIES OF LITHOCHARIS« 1. Gular sutures convcrfring posteriorly 2 Gular sutures parallel along middle 9. lieres 2. Labrura with a median tooth or prominence 3 Labrum with two denticles near center 6 3. Seventh sternite of male with a ctenidium on posterior margin 4 Seventh sternite of male unmodified 4. volans &
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