NO. 1361. REVISION OF AMERICAN SIPHONAPTERA— RAKER. 429 



short, heavy chMiidial .s})inos directed doNviiwiird and backward. On 

 either side of disk of vertex are three oWliciue rows of .small ])ristle.s, 

 the iipi)er with five bristles, the middle of six, and the lower of three. 

 The usual bristles occur on the hind maro-in of the head, the larger 

 one at each lower angle beino- un usual I3' short and stout. The few 

 bristles on the second anteiuial joint are shorter than the third joint. 

 There are six or eight minute l>ristles along the hind margin of the 

 antennal groove. In the position of the eye occurs a daik thickening 

 of the chitin. The mouth parts are uiuisually short, the labial palpi 

 extending little more than one-half of anterior coxje. The maxillie 

 are not more than twice as long as broad. 



The me.sonotum is twice as long on the dorsal line as either prono- 

 tum or metanotum. On the posterior third of the pronotum occurs a 

 transverse row of about twelve bristles, and on the hind margin a 

 ctenidium of about thirty slender spines, the row curving downward 

 and backwai'd laterally. Meso- and metanotum each with a larger 

 row of about ten bristles and anterior to this about three rows of 

 numerous very irregularly placed smaller l)ristles. ^Nletathoracic 

 epiphysis with one bristle on hind border, and anterior to this two 

 rows of live l)ristles each. 



Hind margins of dorsal segments with small teeth as follows: Six 

 on metanotum, six on first abdominal tergite, six on second, two on 

 third, two on fourth, and two on fifth. The abdominal tergites each 

 have a row of about fourteen larger bristles and a second row of fewer 

 smaller ones. Antepygidial bristles all unusually long and stout, the 

 longest in each set of three nearly equaling the pygidium. The abdom- 

 inal sternites each have one transverse row of six bristles. The 

 extremit)^ of abdomen is moderately bristled. One stout l)ristle occurs 

 beneath the pygidium on either side. 



The style is short and stout, not twice as long as wide at the base, 

 with one long bristle at the apex and several short ones proximad of 

 it on lower margin. The substylar flap is obtusely but symmetrically 

 pointed and clothed with eight or ten l)i-istles of varying sizes about 

 the apical margin. The eighth segment laterally near the lower por- 

 tion of the hind margin bears a number of long and a mimber of 

 shorter bristles. 



The hind coxa* are without bristles or teeth on the inside. Hind 

 fenuir with but a single bristle on the side. Hind tibia' with three long 

 spines on hind margin and a close-set row of twelve shorter ones. 

 The spines on apex of joint H of hind tarsi are shorter than joint HI. 

 First pair of spines on fifth tarsal joint dislocated toward median line 

 and directed straight caudad. Length of hind tarsal joints in the pro- 

 portions 25-10.5-8.5-5-7. 



Length, 2.5 nun. Color, pale brown. 



TyjJt.—Cat. ^'o. G924, U.S.N.M. 



