130 Psyche [August 



the scale, hence they could not get at the mature insects or their 

 eggs. The larvae, however, were found under the scales, but were 

 not observed feeding on the eggs or the insects. A larva found 

 July 25 at Ames was beneath an old empty scale, probably feed- 

 ing on egg shells. 



Eupalus sp. 



This, the last of the real enemies to be mentioned, is rare among 

 the scales examined at Ames. The members of this genus have 

 large raptorial palpi and are predaceous. Consequently this spe- 

 cies is included in the list of predaceous mites. 



MITES NOT ENEMIES FOUND WITH THE OYSTER-SHELL SCALE. 



Three species of mites were found frequently a,mong the oyster- 

 shell scales on the limbs and twigs of various trees. One of these, 

 Monieziella entomophaga, is a constant companion of the scales, 

 while the other two are essentially bark or leaf species, and there 

 is no symbiotic or definite relation between them and the scales. 

 These mites are mentioned in the order of their importance. 



Monieziella entomophaga Laboulbene. 



Identity. This species has already been mentioned in connec- 

 tion with Hemisarcoptes mains, with which it has been confused. 

 It is the species which Riley figures doubtfully as a form of the 

 Acarus? mains of Shimer. Lignieres, apparently misled by Riley's 

 figures, calls it Tyroglyphus (Acarus) malus Shimer. The real 

 identity of Lignieres' mite was pointed out by Michael, who re- 

 ferred it to Laboulbene (1852), 



In this country. Banks has described a species very closely re- 

 lated to Monieziella entomophaga under the name of Monieziella 

 angusta. It may be that these two species are the same, for some 

 of the specimens which we have examined show such variations as 

 to strongly suggest the synonymy of the two. 



This species is about the same size as Hemisarcoptes mains, and 

 since the two are generally found together during the season, it is 

 not to be wondered that earlier writers confused the two species. 

 Monieziella entomophaga can be distinguished from Hemisarcoptes 

 malus, however, by the marked constriction between the cephalo- 

 thorajc and the abdomen, by the absence of the tarsal appendages 



