Johnstonianidae — Newell 
413 
1 
2 
3 
4 
DISTRIBUTION OF VARIANTS 
5 6 7 8 
JOHNSTONIANINAE 
a 
a 
b 
c 
a 
a 
b 
a 
Johnstoniana 
a 
a 
a 
a 
a 
a 
a 
a 
Diplothrombium 
c 
a 
a 
a 
b 
a 
a 
a 
Centrotrombidium 
p 
p 
p 
? 
? 
? 
p 
p 
Hirstithrombium 
b 
b 
a 
b 
a 
b 
c 
b 
LASSENIINAE 
Lassenia 
? 
p 
? 
? 
? 
? 
? 
? 
Polydiscia 
? 
? 
? 
? 
? 
? 
? 
p 
Crossothrombium 
2a. Anal sclerites absent. 
2b. Anal sclerites present, usually with one 
or more pairs of setae. 
3a. Protorostral, deutorostral and tritoros- 
tral setae all present and setiform or 
spiniform (deutorostrals often concealed 
under velum). 
3b. Deutorostral setae absent or reduced to 
extremely minute vestiges, tip of ros- 
trum with only two pairs of setae. 
4a. Palpal trochanter with anterior wall 
fenestrated. 
4b. Anterior wall of palpal trochanter not 
fenestrated. 
5a. Terminal seta of palpal tarsus eupathi- 
diform (hollow, thin-walled, etc.). 
5b. Terminal seta of palpal tarsus not typic- 
ally eupathidiform, but flattened, 
strongly serrate, or otherwise modified. 
6a. Tarsal eupathidia 2-1-0. 
6b. Tarsal eupathidia 2-1-1. 
6c. Tarsal eupathidia 2-2-1. 
7a. Dorsal eupathid of tarsus I with com- 
panion seta. 
7b. Dorsal eupathid of tarsus I without com- 
panion seta. 
8a. Dorsal eupathid of tarsus II present, 
with companion seta. 
8b. Dorsal eupathid of tarsus II absent. 
9a. Solenidion 4 of tibia I with companion 
seta. 
9b. Solenidion 4 of tibia I without compan- 
ion seta. 
10a. Coxal setae with formula 2-1-1. 
b. Coxal setae with formula 2-1-2 or 
2-2-3. 
11a. Supracoxal setae absent on gnathosoma 
and coxae I. 
b. Supracoxal setae present on gnathosoma 
and coxae I. 
12a. Vestigial setae absent from patella and 
tibia of all legs. 
b. Vestigial setae present on patella I and 
II only, absent from tibiae. 
c. Vestigial setae present on patella I and 
II and tibia I; absent from tibia I. 
13a. Femora I— III of all legs completely di- 
vided into basifemur and telofemur (six 
free segments beyond the coxae). 
b. Femora I— III undivided (only five seg- 
ments beyond the coxae). 
c. Femora I -III partially divided, the synar- 
throdial membrane well formed ven- 
trally, but absent dorsally (Figs. 87, 91, 
93). 
14a. Tarsi with two unequal claws on all 
legs, the anterior claw more erect than 
the posterior. 
b. Tarsi with three claws on all legs, the 
anterior and posterior claws equal, the 
median (axial) claw more slender, erect. 
15a. Intercoxal area with a pair of setae be- 
tween III. 
b. Intercoxal area without a pair of setae 
between III. 
JOHNSTONIANINAE Thor 1935 
diagnosis: Adults with either one or two 
pairs of sensilla on scutum. Pregenital tuber- 
cle absent. Solenidia 2 typically clavate, differ- 
ing appreciably from s 4 . Supracoxal setae 
absent from gnathosoma and coxa I in both 
larva and adult. Larvae without anal sclerites; 
usually with a single pair of setae in the inter- 
