. Bulletin - United States National Museum. Science. 216 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 33. Genus yEGATHOA" Dana. large, oval, composite. Posterior niaro-in of head produced in three lobes. Anterior margin of first thoracic segment manifestly trisinuate. Post-lateral angles of thoracic segments not produced. Epimera dis- tinct on all the segments of the thorax with the exception of the first; they extend the full length of the segments and are not acutely pro- duced posteriorly. The abdomen is not narrower than the thorax, but continues the oval outline of the bod3^ The
. Bulletin - United States National Museum. Science. 216 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 33. Genus yEGATHOA" Dana. large, oval, composite. Posterior niaro-in of head produced in three lobes. Anterior margin of first thoracic segment manifestly trisinuate. Post-lateral angles of thoracic segments not produced. Epimera dis- tinct on all the segments of the thorax with the exception of the first; they extend the full length of the segments and are not acutely pro- duced posteriorly. The abdomen is not narrower than the thorax, but continues the oval outline of the bod3^ The abdominal segments are not shorter than the last thoracic segments. Pleopods not ciliated. Uropoda and terminal segment of abdomen furnished with hairs. ANALYTICAL KEY TO THE SPECIE8 OF THE (iENI'S .EGATHOA. n. Frontal margin of head produced anteriorly in a median Ungulate projection. ^Fgathua liuguifroiix Kichardson a'. Frontal margin of head not produced anteriorly in a median Ungulate projection. b. Surface of head smooth, evenly convex. Second pair of antennte comj^osed of ten articles. First thoracic segment longer than any of the succeeding seg- ments, which are of equal length Jujathoa oculata (Say) ¥. Surface of head with central portion sharply raised above the lateral portion, which is deeply excavate just in front of the eyes. Second pair of antennae composed of eight articles. First three thoracic segments of equal length; last four subequal aniiO's, Proc. U. S. Nat. Mus., XXIII, 1901, p. 526. Locality. —Trinidad. Body narrow, elongate; abdomen not narrower than thorax. Head with sides rounded. Frontal margin ab- ruptly produced anteriorly into a median lingulate projection, with apex rounded; posterior part of pro- jection forming a raised surface sharply defined on anterior part of head, extending l)ack to eyes. Eyes large, oval, occupying two-tiiirds the width of head. First pair of antennse nine-jointed. Second pair more slender equal in length to first pai
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