AHT. 8 CHIGK3ER MITES OF THE NEW WORLD — EWING 11 



setae moderate in size and number, less than 50 present. Legs 

 moderate; second pair shortest; last pair longest. 



Type species. — Tronibicula glahrwrn Walch. 



This genus stands alone in having only four true setae on the 

 dorsal plate. It is evidently most nearly related to Schongastia 

 Oudemans. Only the type is included. It should now be known 

 as Walchia gldbrum (Walch). 



ENDOTROMBICULA, new genus 

 Plate 3, Figuees 1, 2 



Palpi rounded laterally; palpal claw trifurcate. Chelicerae each 

 with three dorsal teeth and one latero-ventral. Dorsal plate very 

 poorly sclerotized, indistinct, with five setae in addition to the 

 pseudostigmatic organs; median seta simple. Both pairs of eyes 

 well developed, each eye having a complete cornea. Abdominal 

 setae short, inconspicuous. Each tarsus armed distally with two 

 simple, subequal, lateral claws and one longer, simple, and more 

 slender middle claw. Tarsus I with a simple dorsal spine and a 

 simple subterminal seta or spine. 



Type species. — Endotromhicula penetrans, new species (p. 16). 



EndotroTiibicula should come between Hannemania Oudemans and 

 Odontacarus Ewing, being more closely related to the latter genus, 

 from which it differs in having fewer and a definite number of dorsal 

 teeth on the chelicerae, and a vestigial dorsal plate, as well as in a 

 few other characters. 



DESCRIPTIONS OF NEW SPECIES OF TROMBICULINAE 

 TROMBICULA BLARINAE, new species 



Plate 1, Figure 1 



Palpi elbowed, having the second segment angulate laterally; first 

 seta strongly pectinate, almost plumose ; second seta shorter than the 

 first and with several barbs; third seta with several barbs; palpal 

 thumb small, scarcely exceeding the fourth segment; palpal claw 

 slender and trifurcate, two accessory claws being small and situated 

 near the apex. Chelicerae stout, sliarply pointed and with minute 

 upper tooth; lower tooth very minute or lacking. Dorsal plats 

 more than twice as broad as long, front margin incurved between 

 median and each fronto-lateral seta, but hind margin outwardly 

 rounded behind each pseudostigma ; all setae borne by dorsal plate 

 strongly pectinate, postero-lateral pair longer than the others. 

 Pseudostigmata situated about their diameter from posterior margin 

 of dorsal plate and about as far from each other as each is from the 



