16 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
Sonora, Mexico. About 100 adult specimens collected with the holo- 
type are deposited in the USNM, 110749. A series of reference 
specimens representing the known range in the Gulf of California 
has been deposited with SMIC XVIII-3. 
DistriputTion.— Along the Mexican mainland the species has been 
taken from Puerto Pefiasco to Isla Macapule, just south of Topolo- 
bampo. On the Baja California shore of the Gulf the species has 
been collected from San Felipe south to Bahia San Carlos, located 
just north of Santa Rosalia. Within these geographical limits (fig. 11) 
kolpos has been found most frequently and in the greatest abundance 
in near-shore waters. The species has not appeared in samples from 
the southernmost third of Baja California. It is also absent in the 
tows taken between Mazatlin and Ecuador. A related species, 
described next below, replaces kolpos in southern Baja California and 
along the mainland coast, at least as far south as Puerto Vallarto, 
Mexico. 
1.88 
1,80 
1,72 
1,64 
1,56 
1,48 
Prosome Length: (mm) 
1,40 
52 60 68 76 84 92 1.00 108 LI6 124 1,32 30 38 46 
P5 Chela, Inner Circumference (mm) P5 Protopodite Length (mm) 
Ficure 5.—Comparison of P5 in adult males of Labidocera jollae O and L. kolpos @ chosen 
at random: a, length of inner circumference of chela plotted against prosome length 
(measurements of chela made with planimeter from camera lucida sketches of posterior 
view, 80X magnification; circumference limits are from apex of distal segment to apex 
of lateral prong of proximal segment); b, length of protopodite plotted against prosome 
length (protopodite measured along lateral margin at 80 magnification). 
Labidocera diandra, new species 
Figures 6-10 
LOCALITIES, MATERIALS.— See table 3. 
LENGTH AND BODY PROPORTIONS.—Adult and stage V copepodite 
measurements, excluding caudal setae, of specimens selected at 
random are as follows: 
