114 ARACHNOIDEA, 



CASE Tlalsahuate, inasmuch as M. Biart, who had passed a long time 

 in Mexico, had recently received numerous boxes from thence, 

 the packing and contents of which had remained for a good 

 while close to the lawn on which his children habitually played. 

 I, therefore, looked for the insect, and, by the assistance of a 

 magnifying glass, discovered it fixed between two eye-lashes in 

 the middle of the redness. Its form is oblong and its colour 

 bright orange yellow. M. and Mdme. Biart, who had been 

 familiar with it in Mexico, at once recognised it." The specimen 

 was unfortunately dropped and lost, so that we are still Avithout 

 a scientific description of it. 



It is possible that this species may have some relation to that 

 in a case quoted by Kirby and Spence, from Sir Joseph Banks, 

 who, in a letter to Dr. Adams, related that some seamen belong- 

 ing to the Endeavour brig being tormented by a severe itching 

 round the extremities of the eyelids, one of them was cured by 

 an Otaheitan woman, who, with two small splinters of bamboo, 

 extracted from between the eyelashes abundance of very minute 

 lice, which were scarcely visible without a lens, though their 

 motion when laid on the thumb was distinctly perceived. Older 

 authors quote similar phenomena, but as their knowledge of the 

 subject was imperfect, and we cannot cross-examine them, it is 

 perhaps best to ignore them. 



No. 18. Tetranychus trombidinus {Dug., Ann. Sc. Nat. 1834. Trombidium 

 glabrum, Dug., Ann. Sc. Nat. 1834). — 18. Enlarged figure of ditto. 



This has all the appearance of a Trombidium, but it is smooth 

 and not velvet}^, and M. Duges found that it had two spinning 

 papillae behind. 



Genus Raphignathus {Dugcs). 

 Tarsi thick, palpi long, and mandibles sharp-pointed. 



No. 19. Raphignathus ruberrimus [Dug., Ann. Sc. Nat. 1834). — 19. Enlarged 

 figure of ditto. 



This is a Tetranychus, with long palpi instead of short ones, 



