214 NATHAN BANKS. 



■siticus De Geer is the young of Trombidmm phalangil De Geer, a 

 true Trombidium and not an Ottonia. 



Atoma gryllaria Le Baron, Second 111. Rep't, p. 61, which Murray 

 refers to Trombidmm is unknown to me, it u)ay he the young of 0. 

 locvstarum. 



Trombidium balbipes Pack., Mass. Rep't, iii, 26, I have not seen ; 

 it has, according to the description, no thumb to the palp, if such is 

 the case it probably belongs in another family. Four species of 

 Leptus have been described : L. araneee Say, L. hispus Say, L. 

 americanum Riley and L. irritaas Riley. It would be better, I think, 

 to drop these larval names entirely. 



The Rhyncolophidse may be readily distinguished from the Trom- 



bididse by having sessile eyes, and the surface of the cephalothorax 



being continuous with that of the abdomen. We have two genera: 



Four eyes, a dorsal groove Rhyiicolophiis. 



Six eyes, no groove S maris. 



SflARIK Latr. 

 Six eyes two each side and two in the middle farther in front. No 

 dorsal groove. Palpi short, of four joints. The mouth-parts can be 

 considerably retracted into the body. 



Sinari*i occi«lentsilis iiov. sp. — Length 2.G mm. Body oblong, with a 

 short, rounded, snout-like projection in front, and a slight constriction nsar the 

 middle. Body with many small, irregular, flat tubercles, and covered with short, 

 curved, stiff bristles; two submedian rows of six circular depressions and some 

 others less distinct lower down. Last joint of leg i about as long as the pre- 

 ceding joint, slightly enlarged at the tip. Legs clothed with fine short hairs; 

 the legs are shorter than in the European »'?. impressa or the Boreal S. plana, and 

 the fourth pair is a little longer than the first. The mouth-parts are almost 

 wholly withdrawn into the body. 



01ym[)ia, Washington State [Trevor Kincaid]. 



RHINCOLOPHUS Duges. 



Four eyes ; palpi of five joints. On the anterior part of the body 

 there is a median line often called dorsal groove. At the tips of the 

 mandibles is a small circle of hairs ; above the base of the mandibles 

 is a rounded projection, the frontal tubercle bearing several long 

 spines ; the tarsi of the legs are more or less enlarged and furnished 

 with a scopula beneath. 



No species, I believe, have been described from the United States, 

 except B. cavernarum Pack. (Cave Memoir), which is unknown to 

 me. I have obtained several species which live in or near woods, 

 and can run quite rapidly. 



