Bd. V: ii) 
THE ACARI. 
21 
gerlachei ; the dorsal edge of the lower jaw is not raised and is without teeth. The 
dorsal margin of the upper jaw has a sharp excavation at a level with I / 3 of the 
length of the lower jaw. The upper jaw is very broad for the two proximal thirds 
of its length with a high, raised ventral edge, forming an angle of nearly 6o° with 
the dorsal edge of the lower jaw, when closed, from thence abruptly narrowing to- 
wards the distal third, which is of nearly even length throughout. The posterior 
dorsal hair is situated at a level with the middle of the lower jaw. 
The maxillary palps 
(PI. II, fig. ii); the forth 
joint shorter than the se- 
cond one and comparatively 
broader than in R. gigas, 
being only very little more 
than twice as long as broad. 
Rostrum (Text-fig. 40); 
the maxillæ are almost 
wholly fused together, con- 
stituting the short conical 
rostrum, provided at the 
tip vith a median short 
lanceolate appendage; the 
antero-lateral edges pro- 
jecting into a semi-circular, 
thin plate the edge of which is provided with 3 — 4 larger teeth and behind these 
with several small ones. Two pairs of hairy bristles on the ventral side near the 
base and two bare, more pointed hairs (Text-fig. 40). 
The Legs. The tarsi, especially those of the first pair of legs, provided at the 
tip with numerous short, straight and blunt bristles (Text-fig. 46). The pulvilli 
thick at the base, narrowing towards the end, slightly longer than the claws 
(Text-fig. 47). 
Rhagidia megalochela differs widely from all species as yet known of the genus 
by the enormous development and shape of the chela mandibuli. (Compare Text- 
figs 35 — 39 -) 
Locality: No. 14. one specimen. 
Notes on R. gigas subsp. Gerlachei Tin., R. gigas R. Can. and R. 
gelida Thor. 
In order to ascertain whether TrouesSART is justified in his treating R. gerlachei 
as a subspecies of R. gigas , I submitted to an examination the specimens of the latter 
35. 
Big- 35 - Mandibles of R. gigas (from Natal). Fig. 36. R. gigas (from 
Egypt). Fig. 37. R. marochela (from Falkland). Fig. 38. R. racovilzai 
(from Gerlache strait). Fig. 39. R. gelida (from Greenland). 
All figures 232 x . 
