18 A REVISION OF THE TYROGLYPHID^. 



the hair near tip of tarsus is very long in all legs, but the hind tarsi 

 have two long hairs near tip, one of them longer than the tarsus. 

 (Vulva, PI. in, fig. 28.) 



Length, 0.50 mm. 



Specimens from Limburger cheese, Washington, D. C. (Dr. G. 

 Marx). 



This species is near MichaeFs figure of TyroglypJms mycophagua^ but 

 the mite is not so slender, the bristles are longer, and those on tarsi 

 are longer. I am not certain that Michael has correctly identified 

 Megnin's species. 

 Tyroglyphus heteromorphus Felt. 



Male (PI. IV. fig. 89). — Cephalothorax with four long bristles in a 

 transverse row, but the inner pair is not one-half as long as the outer 

 pair; a pair of short bristles on anterior margin; two bristles on each 

 humerus, one short, the other as long as width of body; two pairs of 

 submedian bristles on dorsum, each about two-thirds the length of the 

 abdomen; a rather long bristle on the middle each side, another long 

 one behind this, then a short one, and three long ones each side near 

 tip, each but little shorter than abdomen. Legs with the usual bris- 

 tles, that at apex of penultimate joint scarcely as long as tarsus; the 

 sense hair on tarsi I (PI. IV, fig. 38) and II is about its length from 

 the base; most of the tarsal bristles are distinctly spine-like; the hair 

 at tip of tarsus IV (PI. IV, fig. 36) is not one-half the length of the 

 joint, the bristle at tip of penultimate joint of leg IV is not one-half as 

 long as tarsus, the latter joint as long as two preceding joints together; 

 leg III (PI. IV, fig. 37) enlarged, as in figure, ending in a large claw 

 and two ver}^ long bristles. 



The female difiers in having the bristles of body shorter, especially 

 the abdominal ones; there are four at tip which are not one-half as 

 long as width of bod}^; the tarsi, especially the hind tarsi, are shorter 

 than in the male. The abdomen is, of course, broader, and larger in 

 proportion to the cephalothorax. 



Length 0.60 to 1 mm. 



A peculiar species, which I haye seen onlj^ from decaying asparagus 

 roots from near Washington, D. C. It was described as injuring the 

 roots of carnations at Berlin, Mass. The RJuzoglyphui^ f?^^7^'s Michael, 

 1903, may be a synonym ; howeyer, there are several minor differences 

 which may possibly be due to Michael's inaccurate figures. 



Tyroglyphus armipes n. sp. 



Cephalothorax with four long bristles in a transverse row, but the 

 inner pair is not half as long as the outer pair; a pair of short bristles 

 on front margin. Male with two bristles on each humerus, one short, 

 the other nearl}^ as long as width of body; three pairs of bristles on 

 dorsum, basal pair very short, the others long and reaching beyond tip 



