310 



cies of group x, by having two dorsal shields. I therefore propose 

 the following divisiou and key. 



32. Key to the species of Trichotarsus Can. 



Hypopi. 



Two dorsal shields; tarsi 1 — 4 with 



rninute claws ; circurnference of 



body suboval ; dorsum almost 



hairless; group A 2. 



Tarsus 4 without claw .... 4. 



Tarsi 1 — 3 without lanceolate hairs. 3. 



Tarsi 1 — 3 with lanceolate hairs . Tr. ornatus Oudrns. 



Six suckers on the suckerplate . . Tr. manicati Giard. 



Eight suckers Tr. trifilis Cau. 



Two dorsal shields; tarsi 1 — 3 with 



minute claws; circurnference of 



body suboval ; dorsum with hairs ; 



group B Tr. intermedius Oudms. 



Tarsi 1 — 3 with strong claws: cir- 

 curnference of body subcircular ; 



dorsum with strong bristles . . 5. 

 Two dorsal shields; group C . . Tr. osmiac (Duf.). 

 One dorsal shields; group D . . 6. 

 Tarsi 1—3 with 1 claw .... 7. 

 Tarsi 1—3 with 2 claws. . . .10. 

 Tarsus 4 with one hair . . . .8. 

 Tarsus 4 with two hairs . . . .9. 



Tarsus 1 without lanceolate hairs . Tr. xylocopoe (Donnad.) 

 Tarsus 1 with lanceolate hairs . . Tr. koptorthosomae O. 

 Tarsi 1 — 3 without lanceolate hairs Tr. bijilis Can. 

 Tarsi 1 — 3 with lanceolate hairs . Tr. japonicus Oudms. 

 10 Only one species Tr. alfkeni Oudms. 



Arnhem, 1 Sept. 1901. 





