DACTYLOPUS. LOS 
prehensile, first or second joint of the outer branch 
elongated ; second, third, and fourth pairs with both 
branches 38-joimted; fifth pair 2-joimted and usually 
foliaceous. One ovisac. 
The genera belonging to this sub-family are Dacty- 
lopus, Thalestris, Westwoodia, Ilyopsyllus (?), Harpac- 
ticus, Zaus, and Peltidium. 'The genus Llyopsyllus is 
included provisionally only in this group; its struc- 
ture has not been fully made out, but the abnormal 
form of the mandibles and antennze will probably 
necessitate its removal to some other position. 
Diagnosis of Genera of Harpacticine. 
c TERE. TROIS nits Ga a ree asc Ree nh ees Harpacticus. 
33 
= hock | three (greatly elongated .................. Thalestris. 
=© | branches | J°mts: . 
i= 4 middle not much #/ foliaceous......... Dactylopus. 
g ey ¢ | Joint 4 longer than | 
a 2 pose" | ofthe | thefirstjoint;4 elongated, sub- 
26s 4 outer fifth pair of | falciform, and 
os 3 Lbranch | feet | strongly spined Peltidiwm. 
H 
3 the outer (one joint; ( two-branched ............... Westwoodia. 
= branch | mandible- 
g composed of {_  palp simple, bisetose ............ Ilyopsyllus. 
ay three, the | 
Meammier OF | UCWO-JOINES 00... ee tee cee seni Steer cin Zaus. 
Genus 24. Dactynopus, Claus (1863). 
Body elongated, more or less cylindrical; first pair 
of antenne usually 5—9-jomted; in the male genicu- 
lated ; inner branch of the second pair of moderate size, 
2- or 8-jointed. Maxilla-palp well developed, the 
basal portion numerously clawed and having one or 
two lateral processes; mandibles well developed, the 
