Laguna Ratine Laboratory 127 



Head wider than long; anterior margin broadly emarginate and 

 slightly narrower than posterior margin. Eyes very small, com- 

 pound and placed on the middle of the extreme lateral margin. First 

 antenna 1 have four articles; basal article enlarged much broader 

 than the other articles. Fourth article clavate and finely haired on 

 the superior margin. Second antenna? composed of peduncle of five 

 articles and a flagellum of twelve. Basal article of peduncle very 

 small. Second slightly longer than wide; third somewhat longer 

 than second and almost twice as long as wide; fourth and fifth about 

 equal in length and longer than the third. The maxilliped has a palp 

 of four articles. The mandible is without a palp. 



The first segment of the thorax is only half as long medially as 

 laterally. The rest of the segments are more regular in shape and 

 sub-equal in length ; last two slightly shorter than the others ; pos- 

 terior margins of all slightly excavate. The epimera of second and 

 third segments occupy slightly less than half the lateral margin; 

 epimeron of fourth occupies about half and like the other two is very 

 narrow ; epimeron of fifth segment is broader and occupies about 

 two-thirds the lateral margin ; epimera of sixth and seventh seg- 

 ments occupy the whole length of lateral margin. 



The legs are all similar in structure; propodus di-dactylous and 

 slightly haired with short hairs ; the three preceding segments pro- 

 vided with longer hairs which are more abundant except on the last 

 two pairs of legs, where they are very scant. 



Abdomen consists of three distinct and one partially coalesced 

 segment. First segments are very short, last is long and produced 

 medially to a point. 



Philoscia richardsonae Holmes and Gay. 

 (Figure 71) 



Locality Under old seaweed on the edge of a salt marsh, La- 

 guua Beach, California. 



Color Brown, microscopic examination shows distinct pigment 

 marking's over the whole surface. 



Body oblong ovate ; length slightly over twice the greatest width, 

 6 mm. by 2.5 mm. Surface of body thickly covered with fine spines. 



Head twice as wide as long, with arched frontal margin and 

 lateral angles subacute. Antenna long; first article of peduncle 

 about half as long as second; second and third subequal in length; 

 fourth twice as long as third and narrower; fifth somewhat longer 

 than fourth; flagellum composed of three articles, of which the sec- 

 ond is slightly shorter than the first or third; the latter ends in a 

 large spine and the whole antenna is provided with numerous short 

 spines, especially on the margins. Antennule rudimentary, only vis- 



