328 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



I. Second antennae two-thirds the entire length, first pair also very- 

 long, abdomen one-half longer, and as wide, as the genital seg- 

 ment, fifth- legs long and slender and tipped with a pair of long 



setee osmeri van Beneden, 1870. 



3, First thorax segment half as long as the carapace; grooves 

 between thorax segments deep and saddle-like; anal laminae 

 five times as long as the last abdomen segment, each with 



two imecjual setae gibbus Nordmann, 1832. 



j. First thorax segment fully as long as the head; grooves between 

 thorax segments shallow; anal laminae the same length as the 

 last abdomen segment, each with two unequal setae. 



mugilis Vogt, 1877, p. 345. 



j. First thorax segment less than a quarter the length of the head; 



grooves between thorax segments shallow and indistinct; anal 



laminae five times the length of the last abdomen segment, 



each with three setae trisetaceus Nordmann, 1832. 



ERGASILUS FUNDULI Krbyer. 

 Ergasilus funduli, Kroyer, 1863, p. 228, pi. 11, figs. 1, a to/. 



Female. — Body pyriform, from two and a half to three times as 

 long as wide, strongly narrowed posteriorly. Head completely fused 

 with the first thorax segment, without groove or emargination at the 

 point of union. Carapace two-thirds the entire length, with the 

 antennal area strongly projecting at the center of the frontal margin, 

 and separated from the rest of the cephalon by a well-defined groove. 



Free thorax segments diminishing regularly in size; genital segment 

 somewhat oval, with a pair of rudimentary legs near the openings of 

 the oviducts. Abdomen three-jointed, all the joints very short and 

 wider than long; anal laminae minute, as broad as long, each tipped 

 with three setae, the inner of which is twice as long as the others. 

 Egg-tubes cigar-shaped, narrow and about as long as the entire body; 

 eggs in three or four longitudinal rows, fifteen or sixteen eggs in a row. 



First antennae very short, not reaching the end of the basal seg- 

 ment of the second pair, and indistinctly segmented; segments broader 

 than long, the last one only with setae. Second antennae about one- 

 third the entire length, the first two segments thick and swollen and 

 forming together a stout base, the terminal joints much more slender, 

 the last one in the form of a claw with a small conical knob on the 

 concave side near the base. The second joint also has a stout, thumb- 

 Uke protuberance at the proximal end on the outer margin. Kroyer 

 makes the structure of these second antennae the distinctive char- 

 acteristic of the species. 



The mouth-parts have never been described, but Kroyer states 

 that they are the same as those of other species, with no apparent 

 peculiarities. The first four pairs of swimming legs are biramose, 

 each ramus with three joints; the fifth pair are reduced to jnere 

 spines on the sides of the fifth segment. 



