136 



ARACHNOIDEA. 



CASE about T. tinctormm ever having been used as a dye, still more sc 

 of T. holosericeum ever being obtained in such quantities as to be 

 utilized, and quite certain, from what is to be seen of the insect 

 when preserved in cabinets, that if it were, the colour of none of 

 them would stand, unless some suitable mordant to fix it were 

 also found. 



Trombidium bulbipes {Packard), 3rd Ann. Report on injurious and bene- 

 ficial Insects of Massachusetts, 1873. 



Dr. Packard (loc. cit) describes this 

 as an unexpected enemy of the Aphis, 

 which he found in July and August in 

 considerable numbers in his garden 

 in Massachusetts, busily engaged in 

 devouring the plant lice on the rose 

 bushes. It is scarlet-red, like most of 

 the rest of the Trombidii, and we re- 

 tain it among them provisionally; and 

 although its palpi without appendage, 

 here figured, may seem 

 to call for a new genus 

 for its reception, its 

 swollen tarsal joint and 

 elongated anterior legs 

 seem to indicate an affinity with Rhyncholophus. 



"^ 



Trombidium bulbipes. Copied 

 from Packard's figure. 



Palpi of ditto. Copied 

 from Packard. 



No, 22, 



Trombidium gryl- 

 larium.— Larva. 



Trombidium gryllarium (Astoma Gryllaria, Le Barony 

 Illin. Ent. Rept., 156). — 22. Enlarged figure of larva. 



As in Other insects the same class at once fur- 

 nishes us with friends and enemies, so the mites 

 are not entirely to be regarded by man from a 

 hostile point of view. If they carry on warfare 

 on their own account it is not always against our 

 interests. It is sometimes as our allies and against 



