26 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 63. 



MACROGYROPUS DENTATUS, new species. 



Plate 1, fig. 5. 



Female. — Head broader than long; temporal lobes not evenly 

 rounded ; antennal fossae short and ending in a deep pit posteriorly : 

 palpi with the four segments very distinct and not extending beyond 

 the margin of the head. Antennae rather small for such a large 

 species, third segment verj' distinct from the last which is almost 

 cylindrical. Prothorax about three-fourths as broad as the head 

 and much the broadest at its middle. Mesothorax about as broad 

 as the head and with sides divergent posteriorl3\ Metathorax 

 broader than the mesothorax and similarly shaped. Abdomen with 

 swoolen sides and almost twice as long as broad ; above each segment 

 has a single transverse row of small, short setae and a pair of much 

 larger lateral setae. Gonopods low and each with a fringe of about 

 six or eight setae. Tibia I (pi. 1, fig. 5) with its inner distal border 

 exj^anded into a lateral lobe which is fringed with a row of short, 

 stout, subequal, toothlike setae. Tarsus I with first segment slightly 

 curved and almost as long as broad, second segment longer than 

 broad. Distally tarsus I bears two claws; the anterior, which is 

 much the larger, is almost equal to segment II in length, evenly 

 curved on the outside and slightly toothed on the inside ; the posterior 

 claw is not more than a third as long as the anterior one and is 

 simple. 



Length, 2.73 mm. ; width, 1.15 mm. 



Egg. — Very long, about three times as long as broad, and with non- 

 opercular end free, not being encompassed b}' any cement cup. 

 Operculum large, fringed on its circumference with a single row of 

 nodular cells of which there are about three dozen, central area evenly 

 rounded and smooth. Rim of opercular opening with slight flange. 

 Cement attachment structure not conspicuous; hair attachment 

 sheath never over two-thirds as long as the ^g'g itself and without a 

 free end ; cement cup wanting, the egg being held entirely by cement 

 adhering to its sides. 



Length, 1.10 mm. ; width, 0.45 mm. 



Type host and type locality. — Pecari angulatus crusnigrum from 

 Greytown, Nicaragua. 



Type slide.— C'At. No. 23755, U.S.N.M. 



Described from specimens on type slide except for the description 

 of ^gg. The following material at hand : Four females, two young 

 and two eggs on skin of Pecari angulatus crusnigr-um (Cat. No. 



QQon'o ' U.S.N.M.) from Greytown, Nicaragua, by Doctor Birt; one 



egg on skin. Cat. No. 12074, U.S.N.M., and three eggs on skin. Cat. 



