2 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



scribed from immature stages were almost universally recog- 

 nized. In regard to "red bugs," they have been bred twice 

 in Europe and the adults were species of the genera Trom- 

 bidium and Rhyncholophus ; that the young "red bugs" 

 attacking warm-blooded animals may come to maturity in case 

 the host attacked is one of the small mammals, but not if one 

 of the large mammals. 



NEW AMERICAN MITES. 



[Arachnoidea, Acarina.] 



BY NATHAN BANKS. 



The following pages contain descriptions of some new spe- 

 cies of mites, mostly from the United States, several of which 

 are of particular interest. 



The Histiostoma is probably an inhabitant of the nests of 

 rats; but these specimens were taken from a rat, while the 

 migratorial stage was found attached to a flea. Here I re- 

 frain from quoting the famous lines of Dean Swift. Several 

 of the species were taken by Mr. Brues from ants' nests in 

 Texas; one, the Hypochthonius , is a very uncommon form. 

 The Halarachne, from the seal, is the third species of this re- 

 markable genus, and the most striking species of all of them. 



The Gamasus, from a Perornathus. is another unusual form 



o 



in its genus ; possibly it will form a new genus or subgenus. 

 The Ornithodoros, from Cuba, is the most peculiar species so 

 far known in the genus. 



Family TROMBIDIID^. 

 Trombidium superbum, new species. 



Closely similar to T. magnificum. Red, with several patches of white 

 hair, one each side in front of coxae III, extending upward, and there 

 narrowly connected to a white spot each side over coxae III; an elongate 

 white patch on median part behind, and the vicinity of the anus white. 

 Much white hair under the basal joints of legs I and II, and the tips of 

 the joints of leg IV white; also white hair under basal joints of this leg. 

 Sometimes there are one or two other patches of white hair. Body of 

 general shape and size of 7*. magnificum; the hairs of body are not as 

 long, while tarsus IV is rather longer than in that species The palpus 

 is like that of T. magnificum^ but the thumb is larger. 



Tucson, Arizona. 



Readily separated from T. magnificum, as well as from the 

 Mexican 7. dugesi, by the patches of white hair. 



