180 PROCEEDINGS OF THE NATIONAL 
MUSEUM VOL. 95 
ratus being but a trifle larger. The typical female from Costa Rica 
is almost exactly the same size as the females from 7’. s. serratus. 
The male genitalia, while presenting certain minute differences, 
are very uniform as to proportions, with the slight variations in size 
corresponding to the size of the insect. 
insects into different races of parvulus would 
and serve no useful purpose. 
To attempt to separate these 
be pure hair-splitting 
This species and H. minutus seem to be among the most stable of the 
tinamou lice, having remained almost identical while their hosts 
have undergone considerable differentiation, especially 7’. ¢. tao. 
MEASUREMENTS OF HEPTARTHROGASTER PARVULUS FROM FIVE TINAMOU 
HOSTS 
From Tinamus From T. m. percautus 
major castanei- 
ceps (female) 
Structure Male Female 
TB OG PUGrae moun RO 1.18 | Beas ais (Ab ead ep 
frons_______-- 0. 30 0. 36 
Head {fron Kaa 0.304 | 0.444! 0.326 0.395 0.35 0.52 
IPTOCAORAxes= eee 0. 14 0. 30 0. 145 0. 32 0.15 0. 33 
Mesothorax-_-____-_- 0.13 0. 444 0.13 0. 50 0.12 0. 52 
Metathorax._------ 0.14 | 0.40 | 0.15 | 0.456} 0.15] 0.44 
Abdomen_-_-____---- 0. 67 0. 54 0. 61 0. 60 0.73 | 0.65 
Antennae____-____- ONTS Gk eer oran 0. 24 0. 065 0.18 0. 033 
PAT ATIOLS i igo ena TERE aE aay enya ESSE ao 0. 108 CONICAL SY fi een eed Pali 
Endomeral plate___|_-._._-_|_-_--_-- | OROSS fy MONO | eee een eae 
From T. serratus serratus 
Structure Male Female 
Length} Width | Length 
BOG ys MR AGRE ICING panan Be OSI | Merseisiae LON ben A 
PT OTIS tea ae A OB Nes 0. 28 0. 33 
Head} ons ALR AT ON ON ON oe 0.35 Oe | 0.44 
IPTOGH Ora Ree ia as AS NL Vee Re 0.13 0. 29 0. 14 0. 32 
Miesothora rcv sere aon Uae aa Ue 0. 108 0. 43 0. 12 0. 44 
Me tat hora xe eee Aner 0.18 0. 40 0. 14 0. 40 
FAST OTC TABLA NMU A aS a) a ee in a 0. 564 0. 53 0. 65 0. 54 
VANTAGE TAT EE We IE eR AU NL eC eal 0. 217 0. 06 0.174 | 0.033 
TP ATATN OTS eee ee INN 2 jae ota neal 0.10 COP Oats Yl exerts oop] KOVED A 
Hndomeralsplateweess eae enanee ONOS45 i OOS Sip | eee | eee 
Length Width | Length; Width Lengit] Width | Length) Width |} Length] Width 
From 7". tao tao 
Male Female 
0. 285 0. 337 
0. 326 0.37 0. 345 0.49 
0. 14 0. 33 0.15 0. 326 
0.12 0.475 | 0.13 0. 49 
0.15 0. 42 0.16 0. 45 
0. 59 0.565 | 0.73 0. 63 
0.217 | 0.07 0.18 0. 033 
0.12 F072) eee 
0. 06 OFO3ig | Pass 
From T. s. ruficeps 
Male Female 
—_———__ —__—_. — —$ 
Width Tength Width | Length} Width 
—_——— ————e 
103 st [ase 1.12 
0.28 0.33 
| 0.30 fae | 0.905 ad 
0.15 | 0.326] 0.13 0. 293 
0.11 | 0.445] 0.108] 0.456 
0.13 | 0.40 | 0.144] 0.41 
0.51 | 0.565] 0.64 0.57 
0.206 | 0.055 |_______- 
OXOGSH NN OS 065i ee ence 
OW5 |) 0,088 |. 
HEPTARTHROGASTER LATACEPHALUS, new species 
FIGURE 20, a-c 
Types.—Male and female, adults, from Crypturellus u. undulatus, 
collected by the author at Boca Chaparé, Bolivia, August 25, 1937; in 
collection of author. 
