BULLETIN FLORIDA STATE MUSEUM


 Lateral line development is described by Bath (1977). He refers to the
development of the lateral line as "type C," which is a reduced form of the
lateral line consisting anteriorly of alternating narrow branches from the
main canal. This branching pattern terminates immediately behind the
pectoral-fin base, and the lateral line continues posteriorly in the form of
short straight tubes to its terminus at about the middle of the body.
 Primary sexual dimorphism is in the form of a greatly reduced first anal
spine in females, and in nuptial males having enlarged, fleshy structures
with many longitudinal folds present on both anal spines (see Smith-Vaniz
1980: Fig. lb).
 Secondary sexual dimorphism was found in color pattern (see discus-
sion of coloration), maximum length, and maxillary length (in some popu-
lations of Chasmodes saburrae). The SL of the largest male in any given
population of Chasmodes exceeds that of the largest female by 2 to as much
as 25 mm. This difference in length may be related to territory maintenance
by males.
 Statistical analysis of the maxillary length character (Tables 2, 3)
revealed a significant sexual difference in 4 of 7 populations of Chasmodes
saburrae, but no significant sexual dimorphism was found in populations of
C. bosquianus. A similar analysis of the number of mandibular teeth
(Tables 2, 3) showed no sexual dimorphism for any population of Chas-
modes. I am unable to explain the appearance of sexually dimorphic
maxillary lengths in only 4 of the 7 populations of C. saburrae tested. The
biological significance of this sexual dimorphism is unknown.
 Coloration shows no variation among the species and subspecies. Colo-
ration of males varies from light lines running longitudinally on a dark
background to a mottled pattern. Females of all sizes are variously mottled.
In life, territorial adult males have light longitudinal lines on an olivaceous
background with an iridescent blue spot on the membrane between the
first and second dorsal spines and an orange streak extending posteriorly
from this spot to about the tenth dorsal spine. The chest and branchiostegal
membranes of these males are orange. Females, immature males, and
non-territorial males have dark brown and white mottled pigmentation.
(Information on coloration is modified from Springer [1959].)
 KEY TO THE SPECIES AND SUBSPECIES OF CHASMODES
A. Pores in both mandibular series combined usually 6 or more (Figure 1B and Table 1), if
 less than 6, then lower jaw with prominent lip flaps (Figure IB); mandibular teeth with
 broadly rounded tips (Figure 2A) in specimens over 35 mm SL ....................
 .................. ............................ saburrae (Edgewater, Florida, to
 Chandeleur Islands, Louisiana).
AA. Pores in both mandibular series combined usually 4 (occasionally 5 or 6; Figure 1A and
 Table 1), if more than 4, then lower jaw without prominent lip flaps (Figure 1A);
 mandibular teeth with sharply pointed tips (Figure 2B) in specimens of any length ...
 ............................................................ ....... . B


VOL. 29, NO. 2