STUDIES IN NEOTROPICAL MALLOPHAGA—CARRIKER 203 
acters that may be utilized for the separation of some of the forms of 
this compact group into subspecies are the comparative measurements 
and the number of papillae on certain of the abdominal segments. 
With these facts in mind it seems advisable to give subspecific rank to 
all the different Mexican forms although the single female from C. 
cinmnamomeus sallaei is very close to the nominate form in measure- 
ments but has the arrangement of papillae different. 
Figures of the genitalia of three of the new South American forms 
are given, while a figure of yapurae has already been published, and the 
three Mexican forms have the genitalia so close to those of yapurae 
that they do not need to be figured. The known races of the species 
are as follows: 
KEY TO THE SUBSPECIES OF PECTENOSOMA VERRUCOSA 
a.’ Tergites III, IV, and V in female with 3 rows of papillae (upper row 
SUVA WSS 6) YS aN At MI iO NY SRIRAM 2 La EN EON UE CO verrucosa 
a.” Tergites III, IV, and V in female with never more than 2 rows of papillae 
and sometimes one of these sclerites in one or both sexes with papillae absent. 
b.. Tergite V in female without papillae. 
c.. Size smaller (head 0.81 by 0.53 in female; male unknown)__ cinnamomea 
c.” Size larger (head 0.34 by 0.63 in female) ; tergite V in both sexes without 
papillae; tergite IV in male also without papillae____________ tinami 
b.” Tergite V in female with but 1 row of 2 papillae; male with none in IV 
EET OVD Wb AYA Lar So USS A RIO, A RAE SVAN HU A ed UI A XRD SO A boucardi 
b.. Tergite V in female always with 2 rows of papillae. 
c. Tergite V in male without papillae; size small; abdomen narrower in 
female than in male (0.57) ; antennae 0.18 in both sexes______ angusta 
c.” Tergite V in male always with 1 row of papillae (1 to 5) ; female always 
with 2 rows (2 to 5). 
d.* Tergites III and IV in male with but a single row of papillae (8 to 5) 
(a few specimens of punensis and yapurae will fall into this section, 
but they usually have two rows) ; female with 2 rows of 4 to 6. 
e. Size larger (head in male 0.30 to 0.34 by 0.48 to 0.50) ; tergite V in 
female with 2 rows of 4 or 5 papillae, or 2 or 3. 
f. Tergites III, IV, and V in male with a single row of 3 papillae; 
genitalia of different size (see fig.) -.___.__.________ punensis 
f.. Tergite III in male with a single row of 4 papillae, tergite IV with 
8, and tergite V with a single row of 1; genitalia differ from those 
OL DUMENSTS NSEC HL) oe MLN gies Se VS DL AUER AS nigriceps 
é. Size smaller (head in male 0.28 by 0.45; antennae 0.15 in male, 0.21 
in female) ; genitalia different (see fig.) ; tergite V in female with 
2 rows of 2 to 4 papillae; in female tergite III has 1 row of 4 to 5; 
RVehaselinows of 3 toa aVvelasil TOWwiOky2au ee nse meserythra 
d.’ 'Fergite III in male always with 2 rows of papillae, and some specimens 
GEL STOW IVA ASO vies Ackil UREN eu, inconspicua, punensis, yapurae 
c. Tergite V in both sexes with 2 short rows of papillae; size very 
