212 NATHAN BANKS. 



anterior pair of legs are some distance from the posterior pairs. The 

 species are hirge, red in color, and move quite slowly. 



The larvae are parasitic, and have been described under the genus 

 Leptus. Our species may be placed in two genera: 



With an accessory claw at end of palpus Ottonia. 



No accessory claw Troiiibiditiiii. 



Five species of Troinhidlum are known to me, which I separate 

 as below : 



1. — Body witb clavate hairs !i><'abriiili. 



Body with feathered hairs 2. 



2. — Claw of palp with a tootli, tliird joint of i)alp Ions gigaiileuill. 



No tootli to claw 3. 



3. — Hairs very long, those on tliumh nearly as long as itself, third joint of palp 

 short, larger species ina;£iiifi<'iini. 



Hairs short, those on tiie tliumb quite short, smaller .s|i('cies 4. 



4. — Third joint of palpi long, body oblong, eastern form Kericoiiiii. 



Third joint of palpi short, body pyriform, western form pacificiiiii. 



Tronihiditiin scabruin Say, Comp. Writ. vol. ii, p. 16. — Length 2. — 2.5 

 lum. Body with very numerous, small, clavate. red hairs; legs with short, 

 simple hairs, those on the underside at tip longer, all the joints short, last joint 

 of leg i cylindrical, longer than the preceding one. The anterior legs are about 

 as long as body; the posterior ones reaching behind the tip of the abdomen. 

 Abdomen less than twice as long as wide, much broader in front. Second joint 

 of palpus very broad, swollen above, beneath with some long, fine hairs; third 

 joint nearly as broad as long ; fourth short, ending in a long, slender claw ; fifth, 

 or thumb, clavate, reaching beyond the end of the claw, aiid with many short 

 hairs. 



Lives in the woods. Washington, D. C, and Sea Cliff, N. Y. 



Troinbidiuin serifeuin Say, Comp. Writ. vol. ii, p. 16. — Length 3. — 

 3.5 mm. Body oblong, tvrice as long as broad, slightly broader in front. Legs 

 shoi't, anterior pair not as long as body, posterior pair not reacliing end of abdo- 

 men. Last joint of leg i equal to or barely longer than the preceding one, and 

 slightly enlarged at the tip. Body thickly clothed with short, fine feathered 

 hairs. Second joint of palpus not near as broad as in scahrum, twice as long as 

 broad ; third joint nearly twice as long as broad, the fourth long and tapering 

 to a short (;law; the thumb is clavate, reaching much beyond the claw, and with 

 many short hairs. 



In woods and in fields. Ithaca, N. Y. ; Beaver Dam, Wis. [W. 

 E. Snyder.] 



Troinbidiuin gigaiitenin Riley, 1st Kept. U. S. Ent. Com.— Length 

 5 — 9 mm. Body about one and one half times as long as broad, broader in front, 

 with seveial transverse impressed lines and some shorter depressions. The an- 

 terior pair of legs is sliorter than the body, the jiosterior pair about reaching to 



