12 



PROCEEDINGS ENTOMOLOGICAL SOCIETY 



from basal joints; femora III and IV each with three narrow scales 

 beneath. 



Length, 0.4 mm. 



Austin, Texas, in nest of Ecilon ca-cum (Brues). 



Family TYROGLYPHID^. 

 Histiostoma tarsalis, new species. 



Body about one and one-half times as long as broad, broadly rounded 

 behind, slightly tapering in front to the beak; dorsal surface smooth, 

 with a few very short bristles. Legs as long as body, front pairs thicker 

 than hind pairs. All tarsi very long, as long as the three preceding 

 joints taken together, extreme base of tarsi I and II show the sense-hair 

 and near it is a short, stout spine, other spines at middle and tip of tarsi 

 (as figured), the penultimate joint (tibia) of legs I and II has a long 

 bristle above beyond middle, the femora I, II, and IV have a short 

 spine beneath at middle, also under tiba- III and IV at middle. 



Length, 0.35 mm. 



Taken on Mus rattns by Dr. M. B. Mil/main; a Hypopits 

 (probably of the same species) attached to a rat flea, Ccra- 

 toph\llus fusciiiti-ts; all from Berkeley, California. This H\- 

 popns has been figured in Entomological News, 1909, p. 

 by Dr. Fox. 



EXPLANATION OF PLATES I TO III. 



FIG. 



I. Gainasns frontalis, leg II 



tarsus. 

 2. Oribata consimilis, pseu- 



dostigma. 



.'!. Oribatella angitsta. 

 4. Pteroptus echinipes. 

 \ Raphignathus breins. 

 (i. Ornithodoros marginatus, 



margin of body. 

 7. Liacarus medialis. 

 s. NotJirus tenninalis, end 



of body, pseudostigma. 

 '.). Ornithodoros marginatns, 



leus I and IV. 

 Id. Oribatella valida. 



I 1. Hypochthonius texainis 

 12. HalaracJine attenitata, 



sternum. 



l:;. I'e/ops ti/na/is, details. 

 14. Pteroptus grossus. 



FIG. !">. Histiostoma tarsalis, de- 

 tails. 



Iti. 'Macrocheles helvina. 

 17. NotJirns carinatus. 

 is. Gam asus predator, leg II. 

 I'.i. Gafnmna partita. 

 JO. G alumna pterota. 



21. Liacarus capitatus. 



22. Gamasns calcarator leg 



II. 

 2.">. Ixodes trqualis, shield 



capitulum. 



J4. Lee laps longitarsus. 

 2.">. Kreiiiti'iis inodt'stus . 



21 >. Gamasns calcarator, epi- 



stome.. 

 J7. Kronu'us modest its, leg 



III. 



28. Gamasns calcarator . 

 J'.t. Gamasns partitas. 

 :lo. La'laps 



