STUDIES IN NEOTROPICAL MALLOPHAGA—CARRIKER 7 
MEGAGINUS EMARGINATUS DISSIMILIS, new subspecies 
FIGURE 8, e 
Type.—Female, adult, from Crypturellus souwi nigriceps, collected 
by the author at Tamborapa, northern Peru, July 14, 1983; in collec- 
tion of author. 
Diagnosis ——The type and one female paratype have some of the 
characters of eacavatus but differ strikingly in others. The mark- 
ings on the pleural plates are quite different, there being no band along 
the lateral margin of these sclerites, while the longitudinal band is 
nearer to the inner margin of the plates, and the median transverse 
band begins at the outer edge of longitudinal band and extends some 
distance znside of the sclerite, into the tergal plate. The first and the 
sixth paratergal plates are without markings except for a very faint 
longitudinal bar along inner edge of sclerite on first segment. 
The clypeal emargination is even larger than in excavatus and of 
different shape, being less rounded on the posterior portion, while the 
preantennal area of the head has the lateral margins decidedly con- 
cave, and the whole head is differently shaped. 
Unfortunately no males are available for study, but the above 
characters seem to be sufficient to warrant the separation of this form 
from all the other races. 
The measurements of diss¢milis are almost exactly the same as in 
the female of excavatus, except that the abdomen is wider (0.63 against 
0.58 mm.), while the clypeal emargination is 0.06 by 0.087 against 
0.043 by 0.065. In both emarginatus and lataclypeus the emargination 
is 0.021 by 0.053 mm. 
MEASUREMENTS OF MEGAGINUS EMARGINATUS 
excavatus dissimilis (female) 
ae 
Structure Male Female 
SS eee eneth Width 
Length | Width | Length | Width 
HES CoG y eran rem TR aN Ld CRON es Aula ede cso ay 1 Sa CPEB ia Mae ee MESO) | BSNS 1, 23 
TAPING Lae Us Se TU VA oa a 0. 875 0. 55 0. 39 0. 59 0. 40 0. 586 
ITO LOTS Xp. ips iseah cs A ic ea RE 2) 0.11 0. 29 0. 13 0. 30 0.12 0. 305 
COLO GMORAKS yin mene a Neu RAYNE ul 0. 195 0. 38 0. 23 0. 41 0. 23 0. 42 
PANDY CLOTIG Tt mites ect ena WIN SE BIE bur Cui 0. 54 0. 54 0. 68 0. 58 0. 67 0. 63 
PAIGE TINA Hes hss yam eh WN Peso ale lL ole 0.18 CUS CO Se ape a RE ey PN MR Sey Pa MD 
BAS lel ate ae mets tesa Ie 0. 195 CRS a | eae eee ZT a ee LE SHAR Pete 1) UNDO 
FERADELITOTSSW Ws ark nari) Wee Me en CER Wand es IC 0. 097 ORO5S) AAs Oat MRI LI Ne a 
Clypeal emargination _.._....._........_- 0. 043 0. 065 | ee ne 0. 06 0. 087 
Genus CUCLOTOCEPHALUS Carriker 
Cuclotocephalus CARRIKER, Lice on the tinamous, p. 101, 1936. (Genotype: C. 
extraneus Carriker.) 
This genus was erected solely on the characters of the female, the 
