58 University of California Puhlications. [ZooLO(iY 



cephalothorax, and the first basal of the posterior maxilliped is 

 without the lamellar appendage; the rest of the oral organs are 

 considerably retrograded. The onter ramus of the first foot is 

 indistinctly 3-jointed ; the first basal of the fourth foot is without 

 the tube-like bristles or hairs characteristic of the female of the 

 genus. The fifth feet (PL 14, fig. 90) as described for the genus. 

 The distal end of the inner margin of the second joint of the 

 outer ramus in the right foot has a group of four or five heavy 

 spines. 



Length : 5.3 nnn. 



Coloration : Semi-translucent in formalin and without pig- 

 ment. 



Occurrence : Two males, Coll. 10-45. Type in the collection 

 of the University of California. 



The spine on the head distinguishes these animals as Gaetanus, 

 and the shape of the spine and the head from the other members 

 of the genus. 



Genus Chirundina Giesbrecht. 



Chirundina, Geisbrecbt ('95), p. 245. 



Female: Allied to UndeucJiaeta and EucJiirella. Rostrum 1- 

 pointed, short; forehead with crest (PI. 9, fig. 2) ; lateral angles 

 of last thoracic segment (PI. 10, fig. 28) produced into short, 

 blunt processes. Inner ramus of second antennae half as long as 

 outer; maxilla as in Eudnrella, but bristles more numerous. 

 Outer ramus of first foot 2-jointed; first basal of fourth foot 

 without spines. 



Male (new) : Like female in general characters, except that 

 the last thoracic segment is not produced, but smoothly rounded. 

 Outer ramus of first foot 3-jointed (PI. 12, fig. 58). Fifth feet 

 somewhat resembling those of Gaidius or Gaetmius; each foot bi- 

 ramus, inner rami 1- jointed, outer rami 3-jointed ; inner ramus 

 of right foot club-shaped, that of left foot long and slender ; the 

 terminal joint of the outer rami is spine-like (PI. 14, fig. 86, 87). 



