16 '3 Transactioiis of the Sodety. 



tliorax, yJo^^^ ^^ ^^^ ^^^^^^ 5 across greatest width of abdomen, ^(jth. 

 Length of first pair of legs, y-Jo^h of an inch ; second pair, j^o^h ; 

 third, yj(jth, and the fourth pair, y^oth of an inch. All the legs are 

 cylindrical, tapering to the well-developed strongly curved claws, 

 with the extending pulvillus, and are sparsely clothed with stout 

 hairs. The palpi . are short, three- jointed, and the mandibles 

 chelate. 



So far no eggs have been detected either in the vesicles or in 

 bronchi containing the Mites. It is possible that these Acarids 

 are larviparous, for Weidman (^)* mentions finding a young larva 

 in the vicinty of a ruptured female. Professor Allman (7), 

 describing a new genus and species of Tracheary Arachnidians, 

 states that on rupturing the walls of the abdomen of female 

 specimens, he frequently obtained young larvae "formed as yet 

 with only six legs, and the abdomen scarcely visible." Allman 



Tarsus of third leg. Adult, x 500. 



states that these small six-legged larv?e were also found in 

 numbers along with tlie adults. These Mites were discovered by 

 Allman in the posterior nares of a Seal {Halicluerus gryphus), and 

 named by him Halarachne Halichceri. His drawing of the larva 

 bears a striking resemblance to the larva found in the lungs of 

 Macacus rhesiis. 



Acari from the lungs of different species of JNIonkeys (including 

 Macacus rhesus) have been described by Newstead and Todd {S), 

 by Newstead (4), Landois and Hoepke (5), but the descriptions of 

 these authors do not coincide with all the morpholoiiical details 

 of the Mites I have had under examination. Weidman (6^), 

 however, has given a full and well-illustrated account of some 

 IMites that he had ol)tained from the lungs of a single Rhesus 

 IMonkey, and his description coincides in all particulars with the 

 specimens that I have obtained from all the lungs that have so far 



^- The italic figures within brackets refer to the Bibliography at end of the 

 paper. 



