THE CANADIAN ENTOMOLOGIST. 171 



NEW GENERA AND SPECIES OF ACARIANS. 



BY NATHAN BANKS, EAST END, VA. 



In the following pages I have included descriptions of a few new 

 genera and species of mites that have been in my possession for some 

 time. Several of the genera are for the first time recorded in America. 

 A note is added on two species of Trichotarsus. Of the two new genera, 

 the Liroaspis is a very remarkable form, and finds its nearest allies in 

 certain tropical species. 



Trombidium granulatum, n. sp. — Bright blood red, the legs are 

 clothed with scale-like hairs, those on the basal joints are white, elsewhere 

 they are red, except on the apical joint of leg I., which is mostly white ; 

 the palpi and mouth-parts are mostly white, but reddish toward the tip. 

 The body is covered above with rounded elevated granules, subequal in 

 size and height ; on the under side they are more scarce and there are 

 some short red hairs. The body is hardly twice as long as broad, 

 broadest at humeri, slightly constricted over base of the third legs, and 

 broadly rounded behind ; the dorsal outline at juncture of head and 

 abdomen shows very little depression ; on the cephalic part there is a 

 median grove, and each side are two sessile eyes. The legs are short 

 and stout, the last joint of leg I. is somewhat swollen, and plainly longer 

 than the preceding joint ; on the median joints of legs I. and II. there are 

 above smooth stripes, where there are few hairs. The hind legs reach 

 considerably beyond end of abdomen, the last joint is not swollen and is 

 about equal to the penultimate. The genital opening is circular, and 

 pale ; the anal opening is elongate. The palpi are short, the second 

 joint much swollen ; the thumb is clavate, and barely passes the stout 

 claw. Length, 1.8 mm. 



A few specimens from Ft. Lee, New Jersey. This species, by its 

 granular covering, is closely allied to the European T. sanguineum, Koch. 

 In that species, however, the thumb of palpus is not clavate, but pointed, 

 the last joint of leg I. is more swollen, the hind legs are rather shorter, 

 and the bases of the legs are not pale in colour. 



Ammonia Americana, n. sp. (Fig. 5). — Rather brownish yellow, with 

 a red mark each side (in alcohol these are lost), and a reddish stripe 

 behind, legs and palpi paler. The mandibles are short, less than the 

 length of the cephalothorax, with two bristles each side ; palpi short, 

 second joint about three times as long as broad, third indistinctly 

 separated from the second, about as long as broad, fourth scarcely longer 



