NO. 1361. REVISION OF AMERICAN SIPHON AFTER A— BAKER. 383 



row oil most ol" {\\v termites. 4 on most of th<> stcniitcs. Aiit<'i)v- 

 o-i(liiil bristlos two, uiid of medium size. Metathorucic (epiphysis with 

 two rows of six or seven l)ristle.s each. Thoracie segments with sin- 

 gles rows of al)out twelv<^ l)ristles each, the hristhvs strongest laterally 



Head of female broadly rounded from oceiput to mouth in female, 

 llatten(Ml above somewhat in mal(\ (lena without a lamina extending 

 over antennal groove, l)ut arnuHl with two spines, one front of the mid- 

 dle of the large eye, the otluM- on lower mai'gin of head over maxilla. 

 Vertex with the usual l>ristles and spine on hind border and two spines 

 on disc back of antennal grooxe. Hind margin of ant<'nnal groove 

 with a f(nv minute hairs below, ^hmdibles extending t»> thi-ee- fourths 

 liMigth ol" anterior coxa'. 



Fore coxa* normally clothed, fore femora with a luuiiber of scatter- 

 ing bristles on side, middle femora with scarcely any, hind femora 

 with a lateral row of about six large bristles. Hind coxa with an 

 ol»li(jue row of al>outten I'athei- stout l)ut minute teeth on inside. The 

 hind legs are large, unusually stout, and heavil}' spined. One of the 

 apical spines on second joint reaches nearly to end of fifth joint. Pro- 

 l)ortionaI lengths of tarsal joints are al)out 25-10-0-5-16. 



In the female the eighth abdominal segment has a lateral row of 

 about live stout spines, the hind margin of this segment being plenti- 

 fully clothed with long and short spines. Tenth tergite with a few long 

 l»ristles. Style about twice as long as wide at base, nai'rowed to the 

 apex, where there is a long, stout spine, and on the lower side are two 

 slender bristles. 



In the male the lateral portion of the ninth tergite is extended in a 

 large, round lol)(\ a])out the apical l)order of which are placed six to 

 eight large, stout spines. Upper claspers about twice longer than 

 wide, somewhat narrowed to the apex, in which rests a short but \"ery 

 thick and stout black tooth. The lower (daspers large triangular, 

 extend(>d fan-like, apical and lower mai'gins bristly on ujjpei- jtortion 

 of apical border, with a short, stout, detlexed spine. 



Length, male, 2 mm.; female, 2.5 mm. Color, clear brown. 



Type.— Cat. No. C.89S, U.S.N.M. 



PULEX LYNX, new species, 

 riate X, ligi^. 7-11, and Plate XI, figs. 1-2. 



Prof. J. M. Aldrich sends from Moscow, Idaho, a large series of a 

 tlea closely related to (ijfiiils but taken on lynx {Li/»-i' raiuidena '■-<). 



In general, the Aestiture and proportions are \oy\ close to those of 

 afinls.^ but this species is more delicately constructed in both respects. 

 The toothed upper male clasper is about four times as bioad as long 

 instead of only twice, and the lateral lobe of the ninth tergite is mucii 

 narrower than in <ijfi)ilK. Tlu* lower (dasp(>rs are not >o shai-])Iy ti-ian- 

 gular and have far fewer bristles. 



