86 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXV.II. 



tip of the til»i;i. l)ut in tliis o-emis it arises neiir the middle of the joirit. 



There are only short hairs on the dorsum of body, l)ut at the tip are two 



k)no- hairs each side. The JL/jH>jni)< of this 

 genus is unknown. It is claimed that the 

 female is ovoviviparoiis. The species of 

 the o-enus TricJiotarsus (formerly Trieho- 

 (htrfijhis) are peculiar in that they occur in 

 hypopial form on ])ees. They have a l)road 

 body, without division into ce})halothorax 

 and al)domen, and provided with a few short 

 hairs. Two species. T. .ri/Joroj)!^ and T. 

 osDihv^ are common in Europe, and both 

 have been recorded from this country. The 

 adult of one species was found in the bee's 

 nest, and has much the appearance of the 

 ordinary Ti/roylypJias. 



The European genus Ilerlr'ia is allied to 

 TricJiofai'Kiix, and is found in the sap flow- 

 ing from wounds on trees. Two other 

 European genera, ChortoglypJtas and Fusa- 

 n//-i/s^ have coriaceous bodies, and the 

 mouth-parts are not visible from above. The 

 former has l)een taken in old hay and similar 

 sul)stances, and the latter from moles' nests. 



The genus L^iitungula^ found on marine alga? in England and Heligoland, 



is peculiar in having a slender hook-tipped process near the tips of 



tarsi I and II. 



Family CANESTKINIID.E. 



This family, named in honor of the famous Italian acarologist, Gio- 

 vanni Canestrini, comprises only a few 

 forms of ver^' small size and parasitic on 

 insects. The}' are related to the Sarcop- 

 tidte, and also appai-ently to the Tvro- 

 glyphida?. The bod}' is entire, although 

 there is usually an indication of the trans- 

 verse furrow on the dorsum. The legs 

 are rather short, Avith few hairs, and ter- 

 minate in a sucker like that of the Listro- 

 phorida\ The mouth-parts are small and 

 concealed in the rostrum; the mandil)les 

 generally chelate. The palpi are simple 

 and filiform. There are sometimes two 

 suckers on the hind part of the venter for 

 copulator}' purposes. The dorsum bears 

 a few hairs or bristles and some longer ones at tip. Their life history has 

 not been investigated. Most of the species occur on beetles, some under 



Fig. 165.— Trichotarsus xylo- 

 cop.e; nymph, and claw en- 

 larged. 



Fig. liiO. — Canestrima sp., female, 



FROM BELOW. 



