ENTOMOLOGISCHE BERICHTEN 
307 
Fam. Tyrophagidae Oudms 1924. 
A. 1. Skin polished; nuchal hairs strong, hairy. 
B. 1. Propodosoma with transverse row of 4 hairs 
almost equal in length; hysterosoma with 1 pair 
of short bristles, moreover with longer hairs; 
tarsi dorsidistally with little spine, ventridistally 
with 3-5 spines. Tyrolichus OlJDMS. 1924. 
B. 2. Inner pair of transverse row longer; hysteroso¬ 
ma with 2 pairs of short bristles, moreover 
with longer hairs. 
C. 1. Tarsi dorsidistally with 1 spine, ventridistally 
with 3-5 spines. Tyro bonis nov. gen. 
Type Tyroborus Uni nov. spec. 
C. 2. Tarsi dorsidistally without spine, ventridis¬ 
tally with 3-5 spines. 
D. 1. Claw and caruncle normal; maxillar 
plate normally cleft (u>); in adulti 
hairs on coxae III and IV short ; 
Tyrophagus OUDMS. 1924. 
D. 2. Claws short; caruncle minute ; maxil¬ 
lar plate deeply cleft, almost until 
base of palps ; in adulti hairs on coxae 
III and IV long. Povelsenia nov. gen. 
Type Tyroglyphus neotropicus OUDMS. 
1916. ' 
A. 2. Skin granulated; nuchal hairs short and smooth; 
propodosoma with transverse row of 4 hairs, the 
inner pair shorter (bristles) ; hysterosoma with 2 pairs 
of bristles far forward and 2 pairs far backward; 
tarsi dorsidistally without spines, ventridistally with 
3-5 spines; claws short; caruncle minute; maxillar 
plate deeply cleft, almost until base of palps; in 
adulti the hairs on coxae III and IV are short 
bristles. Ebertia nov. gen. Type Tyroglyphus australis 
OUDMS. 1916. 
