218 NATHAN BANKS. 



Tetraiiyclius viri<lis nov. sp. — Length .4 mm. Greenish, with a large 

 hlackisli. or sometimes reddish, spot each side, covering the shoulders of the ab- 

 domen and the posterior angles of the cephalothorax. The cephalothorax is 

 quite distinctly separated from the abdomen by a constriction ; the abdomen 

 broadest at the shoulders: the cephalothorax short, broadly rounded. The body 

 bears a few long bristles, those on the legs are similar, but shorter. The anterior 

 pairs of legs are somewhat larger than the posterior pairs. 



Oil the u])pei"side of the pecan leaves in Texas. 

 Another species is found very commonly on the leaves of oak and 

 chestnut on Long Island. 



Tftraiiyclms bicolor uov. sp. — Length .35 mm. Cephalothorax pale; 

 abdomen dark red, the anterior edge of the red with a median and lateral pro- 

 jections; legs pale yellowish; eyes red; bristles white. Sometimes there is a 

 light dorsal streak on the abdomen. Body elliptical, pointed in front. Cepha- 

 lothorax with four long bristles; abdomen with a submedian row of five, and an 

 outer row of four bristles. All the bristles arise from small, circular depressions. 

 Legs short, subequal, hairy. The male has the abdomen more pointed than in 

 the female, otherwise similar, 



I have found it in all stages during August and September, on the 



upperside of the leaves of the oak and chestnut, on Li)ng Island. 



CHEYLETID^. 



Two species have been recorded from the United States which 

 belong to this family, viz., Cheyletus seminivorus Pack, and Myobia 

 mn.icu/i Schrank. The latter is also common in Europe. I have not 

 .seen either of these forms, nor any other species from the United 

 States, though doubtless several occur in all parts of the country. 



EUPODOID^. 



This sujjer-famil}' embraces three families, but two of which are 

 found in the United States. 



Palpi five-jointed or three-jointed BDELLIDiE. 



Palpi four-jointed EUPODID^. 



The Bdellidie, or snout-mites, are quite readily recognized by their 

 bright red color, their elbowed palpi, and their long, pointed man- 

 dibles. The cephalothorax is quite distinct from the abdomen, and 

 bears two eyes on each side. The posterior pairs of legs are close 

 behind the anterior pairs, and there is no stennum. The principal 

 characters to observe in the separation of species are : the shape of 

 the joints of the palpi, and especially the last joint and its hairs; 

 the shape of the mandibles, and some European authorities lay much 

 stress on the position of the hairs on the mandibles ; the form of the 



