202 University of California Publications. [ ZOOLOGY 
This species is distinct from any of the seventeen described 
species of Labidocera in the form of the last thoracic segment 
of the male, and the genital segment of the female. It approaches 
L. lubbocki Giesbrecht and L. brunescens Giesbrecht, more 
closely than any others, but differs distinctly from them in 
the above-named features as well as in the structure of the fifth 
feet of the sexes, ete. 
Coloration: Rather transparent, intestinal contents light 
green, thorax and abdomen yellowish with green tinge in places. 
Length: Female, 1.6 mm. Male, 1.7-2.2 mm. 
Occurrence: May 24, 1904, one female. June 16, 1904, four 
males. five females. 
Sub-fam. PARAPONTELLINAE. 
Parapontellina Giesbrecht, 1892, p. 73. 
Cephalothorax usually with five, seldom with six segments, 
rostral filaments slender or lacking, last thoracic segment with 
rounded or pointed sides. Eyes without dorsal chitin lenses. 
2 Abdomen usually with three, seldom two segments, at 
times asymmetrical. Anterior antennae 17- to 19-jointed; sev- 
eral proximal joints fused in addition to the terminal points. 
Second basal of mandible elongate, usually eylindrical, blade 
narrow with from five to seven teeth. Maxilla elongate, lobes 
slightly protruding and not articulating; rami more often 
stunted; the entire second basal may be absent. Distal hooked 
bristles of anterior maxillipeds long and strong, seldom so on 
proximal portion of the appendage. Posterior maxilliped as in 
the Pontellinae but inner ramus is only 1- or 2-jointed. Outer 
ramus of anterior four pairs of feet 3-jointed, inner ramus of 
second to fourth or of all 2-jointed. Fifth pair stunted, basal 
1- or 2-jointed, outer ramus 1-jointed usually claw-like and with- 
out inner ramus; not always symmetrical. 
& Sexual peculiarities in form of body, anterior antennae 
and fifth foot. Last thoracic segment and abdomen at times 
asymmetrical as in many Pontellinae; abdomen with five seg- 
ments. The right grasping antenna simulated in some respects 
in the left; the right antenna with but little broadened middle 
joints and differences in the segmentation of the joints in the 
eS ae eg A i NE A ma ee 
