STUDIES IN NEOTROPICAL MALLOPHAGA—CARRIKER 97 
slightly shorter and thicker in both sexes; hyaline frontal margin 
bilobed in both forms but wider in Mexican specimens. 
If we consider the wide range of individual variation present in 
this genus, these differences do not seem to be of sufficient extent or 
importance to warrant the separation of the Mexican parasites. I 
have found other species of Mallophaga to be the same on both 
Tinamus major castaneiceps and 7. m. percautus. 
PSEUDOLIPEURUS TINAMI SERRATAE, new subspecies 
FIGURE 2, f 
Type.—Male, adult, from Z%namus s. serratus, collected by the 
author at Todos Santos, Rio Chaparé, Bolivia, September 9, 1937; in 
collection of author. 
Diagnosis—In general appearance very close to P. ¢. tinami but 
slightly smaller in all body dimensions (see table of measurements) 
except the genitalia, which are actually larger (paramers, 0.16 by 0.097 
against 0.14 by 0.09; endomeral plate, 0.14 long against 0.11). 
The temples are less rounded, running almost straight back from 
the eye to the rounded posterior angle, and not uniformly curving 
as in tinami. The most striking differences between serratae and 
tinami are the shape of the endomeral plate and the longer, slenderer 
paramers, with thicker ends (see figures). The genital armature in 
this genus furnishes excellent characters for the separation of species 
and subspecies. 
MEASUREMENTS OF THE TYPE (MALE) OF PSEUDOLIPEURUS TINAMI SERRATAE 
Structure Length Width 
TE XOX spl a 2 ae EA tT eR age a a a ea ee 1. 74 
OTIS Sao ee earer ge eye te RN ea ee tS ee Nae = 0. 26 
a SAU SSS INA ME ee a 0. 46 0.39 
TER QOL ELOY gsc a She REC et 8 EE ee te a 0. 18 0. 24 
Pterothorax| om SORTIURee PH ws Uae TOU MD TNT TTD OK RAMON Cue AS Tne RG St GU a eC TDR 0. 27 Whe! 
TOT eed na PREM LR a ONC PMS SLR aa RUBE CW Lag 0h Peed 0.38 
PANE LO TTAC TRE He ren cee a sae CATE SERIO Ly A aA es I ee a a 1.02 0. 32 
PATI COT TAG He inthe ues eae REN LAB Sy Ok A a se Ee a a 0. 38 0. 045 
JEXIW SNORT Sy ope UA DNAS NOISY ge Su TS) et AA a a AL a ae 0 0.16 0. 097 
Hndomeraliplateenesceosneetemser nn he Pleas meet ns oon a eg) meen 0. 14 
This race of ¢inamé differs more from the nominate form than does 
P. t. rujiceps, especially in the shape of the temples and the endomeral 
plate. Zinamus major and its races are very closely related to the 
T. serratus group, so much so that there has been uncertainty as to 
which group the Colombian bird, 7’. s. rujficeps, should be allocated, 
some authors having placed it under major. The close relationship 
575507—_44—_2 
