8i 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXVIII. 



7\ Jonglor Gervais, b^it the bristles are .smooth. This species at times 

 is very destructive to cultivated mushrooms, and once in a bed it is very 

 difficult to eradicate. Biisck" has given an account 

 of experiments against it which serve to .show 

 the ditHculty of dealing with the pest. Sexerely 

 infested beds should be destro3'ed, and perhaps 

 if the earth was steam-heated (as is done for root- 

 worms), the eggs would be killed. Another 

 species has been taken by riul)l)ard on oranges in 

 Florida. It is found among the ^^IijtihLspls scales, 

 and is supposed to feed on them. Moniez has 

 described a species, T. 'nmHinaniii^ as occurring 

 abundantly in nests of certain ants. 



The genus Iltstlogaster was based on the Euro- 

 pean //. (-((rplo, and //. riitomophagus. Our species, M. malus^ 

 descril)ed by Shinier and Riley, is evidently a different species. It is 

 found on trees infested with 



Fig. liVJ.— H I.- Til >i_; .^ster 



M.VLrS, M.VNUIBLE .\NI> 

 VENTEK. 



scale insects, and particularh' 

 in coni})any with the oyster- 

 shell bark-louse. It feeds on 

 the scale, possibl}', howevei', 

 only after the latter is dead. 

 The body is more elongate than 

 in Tyroijl iipliiix. and the hairs 

 are quite short. In England a 

 species feeds within decaying 

 reeds. The IL/poj>ns of JUsti- 

 ogrister has a glass}^ eye-like 

 spot on each anterior side of 

 the body: it may be an organ 

 of vision, but there is no defi- 

 nite evidence for this view. 



To the genus liJiizoglyjtJiu.s 

 belong a number of species, 

 found on the ground, in decay- 

 ing matter, on roots of plants, 

 and in bulbs. The body is 

 slightly more pyriform than in 

 most Tyroglyphids, and the 

 species are of rather large size. 

 We have several s[)ecies in the 

 United States. One of them is 

 the ^. Injachith) Hoisduval (7?. 

 echinopuK Fumouze et Robin). 



Fig. 1G3.— Tyroglyphx's i.intneri. female. 



This is the '" l)ulb mite" or ''Eucharis 



ffBuU. No. 38, n. (-., Div. Entom., U. S. Dept. Agric. 



