AMERICAN APTERA. 401 



NEW SPECIES OF ACARINA. 



BY H. E. EWING. 



(Plates XIII.-XVI.) 



In this paper 15 new species of Acarina are described. 

 They are distributed into 12 genera and 8 families. One of 

 the species, Raphignathus tessellatus, is the first representa- 

 tive of the genus Raphignathus to be found in America; 

 another, NeopJiillobius harti, is the second representative of 

 the genus to be found in this country. The members of the 

 first named genus are especially characterized by the uni- 

 formally reticulate integument on the dorsal surface of the 

 body. The members of the second genus are noted for the 

 great length of the legs, which may almost be compared to 

 the Phalangidce. One species, Gymnobates longus belongs to 

 the only genus of the family Oribatidcc peculiar to this coun- 

 try. The genus Gymnobates was first described by Nathan 

 Banks. It is characterized by the fact that the pteromorphae 

 are attached to the cephalothorax as well as the abdomen. 



The writer is indebted to the following persons for the 

 collection of some of the species described in the following 

 pages : Mr. C. A. Hart, of the Illinois State Laboratory of 

 Natural History ; Mr. J. Douglas Hood, a specialist in the 

 study of Thysanoptera ; Mr. James Zetek and H. Glasgow, 

 both students of the University of Illinois. 



In each case the species have been described from speci- 

 mens mounted on microscope slides, which method is most 

 advantageous because of the small size of the specimens. 

 The drawings have been made with the aid of an Abbe 

 Camera Lucida. In order to make the paper more complete 

 the writer has given the characters of the different genera 



and families. 



Fam. EUPALID^E. 



No specialized setae on cephalothorax arising from a 

 pore on the postero-lateral aspect ; integument not leathery 

 or chitinized ; palpi composed of three or five segments, not 

 geniculate but ending in a large, stout claw ; mandibles end- 

 ing in one claw; eyes absent or only a single pair present. 



TRANS. AM. ENT. SOC, XXXV. (51) NOVEMBER, 1909 



