39 68 Proceedings of the Royal Irish Academy. 



both processes finely pointed. Mandibles small, teeth much as in Berlese's 

 figure of H. badius (1, lii 3, fig. 4), free mandible with a strongly bent spur 

 directed posteriorly. Palps slender, the ventral armature is as follows : — 

 First segment, with two bristles near middle ; second segment, a strong distal 

 spine ; fourth segment, with two stout distal spines on the outer face of the 

 segment. Legs, lengths about 550//, 462/z, -407^, 616ju, femur of second leg 

 (fig. 14e) armed with a stout spur undulated in front and with neighbouring 

 bristles, there is a small conical papilla on the ventral side of the patella and 

 the tibia. Fourth pair with two small sharply pointed femoral spurs, one of 

 these springs from an equally long peduncle. 



Female (fig. 14«), length 896/i, closely similar to H. badius, as figured by 

 Berlese (1, Fasc. lii, 3). The chelicerae are short and robustly built, fixed 

 chela with one very large triangular tooth, and between this and the apex 

 there is a smaller tooth; free chela with two stout teeth placed close 

 together and another much smaller one a little in advance of these (fig. 14(f). 

 Capitulum, epistome. frontal bristles as in the male. 



It seems likely that this mite is a shore-frequenting form of H. marginatus. 



Dendrolaelaps n. gen. 



Shape subquadrate. Dorsal shield divided near the middle. Sternum 

 separated from the ventro-anal shield. The latter is very large, incised on 

 the front margin, and in the male sex it is continuous with the second dorsal 

 shield. In the male the second legs are very stout, and the tarsus is armed 

 on the inner side with a stout, sharply pointed spur ; ambulacra present on 

 all legs. Male chelicerae with a long process. Epistome trispinous. Type 

 species D. OuAcmansi sp. nov. 



This genus is allied to Gamasellus, Berlese, which was originally described 

 as a subgenus of Cyrtolaelaps. The presence of a strong tarsal spur, and the 

 fused ventro-anal plates would appear to distinguish it from that genus. 



Dendrolaelaps Oudemansi n. sp. (PI. YI, fig. Iba-d.) 



A small species which greatly resembles Gamasellus cajptator (Berlese) in 

 superficial appearance, especially in the shape and hair armature of the 

 body. 



Male (fig. 15a). — Length 484/x ; breadth 253/i. The sternum is narrow 

 in front, with a cup-shaped hollow for the genital foramen, ending in a 

 pointed extremity at the end of the last pah of coxae ; sides strongly pro- 

 duced between the second and third legs, and to a lesser extent between 

 the two last pairs of legs, hair armature consisting of five pairs of short 

 spines. Immediately behind the sternum is a pair of small, triangular plates, 



