Pacific Coast of North America. 273 



22. EuSYMMERUS, geii. nov. 



Bod}' elliptical. Palp of maxillipeds three-jointed. 

 Second pair of antennas with joints of flagelluni all consoli- 

 dated and forming a single piece. Eyes dorsally situated. 



Lateral margins of thoracic segments expanded, edges 

 straight and full. Epiraera of second, third, fourth, and fifth 

 segments coalesced and firmly united with segments, those of 

 the sixth and seventh segments distinct and visible. 



Abdomen composed of one segment, with suture-lines indi- 

 cative of another partly coalesced segment. 



60. Eusymmerus antennatus, sp. n. 



Body ellipticid, tapering toward the extremity ; surface 

 smooth. 



Head three times broader than long, with the antero-lateral 

 angles prominent. Anterior margin excavate. Lateral 

 margins expanded. Eyes situated dorsally on the extreme 

 lateral margin in the median transverse line. First pair of 

 antennae four-jointed, short, extending only a little beyond 

 the second joint of the second pair of antennae. Second pair 

 of antennae are six-jointed, geniculate, the last or flagellar 

 joint being somewhat clavate. 



quadrate, the second subquadrate, the third is pear-shaped, the fourth 

 se^rment is very small. 



The segments of the thorax are nearly equal in length and breadth, the 

 third and fourth being but little longer than the others. The epimera of 

 the second, third, and fourth segments are very small and cannot be seen 

 from above. On the fifth, .^ixth, and seventh segments the epimera are 

 large and project well behind the margin of the segment in the form of 

 an acute angle. 



The pleon is composed of four segments; the first three are very 

 narrow ; the terminal segment is elongated, with subparallel sides. A 

 marked character of the pleon is its obliquely truncated extremity. The 

 oblique terminus is perfectly flat, with a raised margin. 



The feet of this species, as in the typical species described by Dana, are 

 in two series. The first is composed of the iir^t three pairs of feet, which 

 are comparatively stout and increase in length to the third segment. 

 The .'■econd series begins on the fourth segment with a p.dr of short feet, 

 which fold transversely ; the other pairs are successively longer and 

 fold backwards. The feet of the second series are much more slender 

 than those of the first. The dactyli of all are biungulate. The carpal 

 and propodal joints are spinulose beneath. 



The operculum is not traversed by an oblique line. Ihe sides of the 

 basal segment are subparallel. The terminal segment is about as broad 

 as long. 



Length 15 miliim. ; width 8 milliui. 



Type. No. 2-J579, U.S. X. M. 



