124 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
Genus MEGAGINUS Carriker 
MEGAGINUS EMARGINATUS EMARGINATUS Carriker 
Megaginus emarginatus emarginatus CARRIKER, Lice of the tinamous, p. 98, pl. 10, 
figs. 83-8c, 1936. (Host: Crypturellus obsoletus punensis.) 
A male and a female taken on Crypturellus t. tataupa, Rio Lipeo, 
Bolivia, are extremely close to this species. They are slightly smaller 
in some dimensions but not in all, while the male genitalia are pre- 
cisely the same in shape and measurements of their component parts. 
Most of the discrepancies in measurements might easily fall within 
the range of individual variation. Itis rather unusual to find the same 
parasite on two hosts so different from each other. 
Two males and a female were taken by the author at Samaipata, 
Bolivia, on Crypturellus obsoletus crucis, a recently described race. 
These three specimens of Megaginus are almost identical with others 
from the type host (C@. 0. punensis), only shght differences, all within 
the range of individual variation, being present. 
MEASUREMENTS OF MEGAGINUS EMARGINATUS EMARGINATUS 
. We 
Types (corrected) Cerner s eee Te Lipes, 
Structure Male 
Female Male Female 
Length] Width | Length| Width | Length} Width | Length! Width 
Body ei ie eu CARN) oe eh oe D2 Rn | ee es Odeo es ee WA ee OSE i eats Uae VE Dir pee 
Vea Ree Wah oe caries JE ere 0. 48 0. 585 0. 44 0. 585 0. 40 0. 586 0. 40 0. 668 
IP TO TM ORES tee a8 Sy CO Care O ON AN oa ales 0.102} 0.30 0.108 | 0.308) 0.108 0. 30 0. 12 0. 31 
IRLETOtM OAK: wane tebe: Po LaU elie aR 0.216 | 0.40 0.227 | 0.42 0.19 0. 40 0. 217 0. 42 
ASD GO TINE TINUE it ONG PaGaL Piha le aU 0. 617 0. 617 0. 68 0.617 | 0.56 0. 59 0. 64 0. 61 
ANtONNaew ele le EE OOS RIS 05206) | aes OV G5 twee 0.195 | 0.043 0. 195 0. 04 
Basal la tee ale od vel ane usa 0. 25 OO Tips ee eserre Fit | se 0. 28 (OHO sive (OA sire ra EA 
aramers seer seo oe oe oe 0. 12 OF G5 pean a ees | ae adhe | 0.12 | OQ} 065] eepeeasig ea 
MEGAGINUS EMARGINATUS LATACLYPEUS, new subspecies 
FIGuRE 8, a 
Type.—Female, adult, from Crypturellus soui meserythrus, col- 
lected by the author at Tres Zapotes, Veracruz, Mexico, on February 
26, 1940; in U. S. National Museum. 
When compared with females of M. e. emarginatus we find that 
this new race is considerably smaller in all dimensions except the 
length of the prothorax, which is actually longer but not quite so 
wide. All the remaining measurements are consistently smaller ex- 
cept the front of the head. The head is of different shape and 
porportions, the front being wider, with the frontal emargination 
shallower and the sides of the front more rounded and expanded; 
the emarginations on each side of the occiput are less deep; the 
