194 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



ROCINELA INSULARIS Schicedte and Meinert. 



Rocinela insularis SCHKEDTE and MEINERT, Naturhistorisk Tidsskrift (3), XII, 

 1879-80, pp. 390-391, pi. XH, figs. 1-3. RICHARDSON, Proc. U. S. Nat. Mus., 

 XXIII, 1901, p. 523. 



Localities. West Indies; between Delta of the Mississippi and Cedar 

 Keys, Florida; off Fernandina, Florida. 

 Depth. 227-273 fathoms. 



Body oblong-ovate, about two and a half times longer than wide, 10 

 mm.: 25 mm. 



Head, two and a half times wider than long, 2 mm. : 5 mm. ; tri- 

 angular in shape, the front produced over 

 the basal articles of the antennae. Eyes 

 large, composite, oval, and occupying a large 

 part of the dorsal surface of the head, being 

 very close together 

 in front, but not 

 contiguous. Basal 

 article of first an- 

 tenna small and 

 almost entirely 

 concealed by the 

 front of the head; 

 second article twice 

 as long as first; 

 third article nearly 

 twice as long as 

 second. Flagellum 

 is composed of six 

 articles. The first pair of antennae extend to the end of the peduncle 

 of the second antennae, or to the antero-lateral angle of the first tho- 

 racic segment. The second pair of antennae have the first two articles 

 short, the first article a little longer than the second; the third is twice 

 as long as the first; the fourth is but little longer than the third; the 

 fifth is one and a half times longer than the fourth. The flagellum is 

 composed of fifteen articles. The second antennae extend to the pos- 

 terior margin of the second thoracic segment. The frontal lamina is 

 small and almost inconspicuous. It is rhomboid-shaped at the base 

 and ventrally placed. The maxilliped has a palp of two articles. 



The first three segments of the thorax are subequal; the fourth 

 is slightly longer than any of the preceding ones; the last three 

 are the largest. The epimera are distinct from the segments. They 

 are narrow plates, with the posterior extremities very acute in the 

 last four. The first two have the posterior extremities rounded. 

 The epimera of the seventh segment are produced beyond the poste- 



FIG. 179. ROCINELA INSULARIS 

 (AFTEK SCHICEDTE AND MEIN- 

 ERT). a, FRONTAL MARGIN 



WITH BOTH PAIRS OF ANTENNA: 

 AND FRONTAL LAMINA, b, ADULT 

 MALE. (ENLARGED.) 



FIG. 180. ROCINELA INSULARIS. 

 a, SECOND LEG. x Hi. b, MAX- 

 ILLIPED. x 20i. 



