366 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



and sometimes digitate cliitinous processes. Second antennae four- 

 jointed, the two terminal joints with their entire surface roughened, 

 and tipped with short processes and curved claws. 



Mandible simple, sometimes with a short palp; first maxillse, 

 reduced to mere knobs armed with plumose setse. Second maxillas 

 three-jointed and simple; maxillipeds also three-jointed, the basal 

 joint directly behind that of the second maxilla, the second joint 

 turned forward outside the other mouth-parts and fused to the sur- 

 face of the head, the third joint in the form of a stout claw bent 

 twice like the letter S and armed with plumose setse. 



First swimming legs strongly flattened and widened; second, third, 

 and fourth exopods four-jointed; fifth legs rudimentary, two- 

 jointed. Egg-cases cigar-shaped, narrowed posteriorly; eggs small 

 and numerous. 



Male. — About half the size of the female; general body form elon- 

 gate and slender. Cephalothorax nearly circular in outline; free seg- 

 ments diminishing regularly in size; genital segment considerably 

 enlarged and lobed at the posterior corners. Abdomen short and 

 tapering; anal laminae medium size but the setse are usually half the 

 entire length or more. 



First antennae cylindrical, not enlarged and flattened at the base, 

 and armed with smaller and more slender setae than in the female. 

 Maxillipeds in normal position behind the other mouth-parts, three- 

 jointed, the two basal joints stout, the terminal claw long and slender 

 and toothed along its inner margin. Other appendages like those of 

 the female, except that they are smaller. 



Type-species. — Bomolochus hellones Burmeister." 



{Bomoloclius, ^ajjioXoxoc, the rabble that waited about the altars 

 to beg or steal, veritable parasites.) 



ARTIFICIAL KEY TO THE SPECIES. 



In the following key certain species which have previously appeared under the 

 genus Bomolochus have been eliminated because, after careful study, they are found 

 to be so different from the type as to constitute separate genera: 



Ardcolx, chatoessi, and sc.omberesocis (Kroyer, 1863), cornutus {Clans, 1864), and uni- 

 cirriis (Brian, 1902) belong under the genus Artacolax (Wilson, 1908) (see p. 361). Gra- 

 cilis (Heller, 1865) and tetrodontis (Bassett-Smith, 1898) are placed as species of the 

 new genus Irodes (see p. 390). 



« Nordmann who established the genus described but one species, parvulus, which 

 ought ordinarily to become the genus type. But he had only a single specimen, his 

 description is meager and lacking in most of the details, he published no figures, and 

 his species has neither been described nor seen by any investigator since his day. 

 It can not serve, therefore, as a type-species, but must give place to Bomolochus hel- 

 lones, which was well described and figured by Burmeister in the following year 

 (1833), and has been repeatedly found, described, and figured by subsequent inves- 

 tigators. 



