NO. 1331. hevision of American sipnoyAi'TEUA— baker. S99 



CERATOPHYLLUS PSEUDARCTOMYS, new species. 

 Plate XXIV, licTH. 1-7. 



Two females and a male taken from Arctomys monax at Newport, 

 Herkimer Count} , New York, were sent to me 1)}' Mr. D. B. Yountr. 

 This species is one of the most uniciue forms in the American fauna, 

 presenting several characters not before noted in the Siphouaptera. 



Female: Head veiy broadly rounded from occiput to mouth. Tliree 

 bristles in the lower row^ on gena, the middle bristle smaller, and 

 between this and the outside ones a number of minute hairs in the 

 same row. Upper genal row entirely lacking, although a munber of 

 minute hairs occur above the ej-e. £3*0 subelliptical, low in the head 

 and rather small in proportion. Antennal groove not reaching two- 

 thirds the depth of the head, the hind margin sharply marked and 

 with a number of minute hairs scattered along it. Second antennal 

 joint with four or live bristles which do not extend beyond the third 

 joint. In the position of the stout bristle usually found ])aclv of the 

 middle of the antennal groove there is here only a mimite hair. 

 Hind margin of head w' ith the usual bristles, except that at each loMer 

 angle there are two stout bristles, the lower shorter than the upper. 

 Labial palpi reaching to about half the length of anterior trochanters. 

 Maxilla" unusually blunt. 



Pronotum with a row of about fourteen bristles near the hind 

 margin, which is provided with a ctenidium of about twentj'-six close- 

 set spines. Meso- and metanotum each with two rows of brliiitles, the 

 posterior of about twelve larger ones, the anterior of about the same 

 number of mueh smaller bristles. Metathoracic epiph3'sis with two 

 longer and three shorter spines. 



First and second abdominal tergites with three small teeth on each 

 side, the third and fourth with two on each side. Abdominal tergites 

 each with two rows of bristles, the po.sterior of fourteen to sixteen 

 larger bi-istles, the anterior of fewer smaller ones. Antepygidial 

 bri.stles three on each side and long and stout, the middle one in each 

 group largest. Most of the abdominal tergit(^s each with al)out five 

 unusually stout bristles in one row, and with a second row of one to 

 three smaller bristles. Immediately beneath pygidium on either side 

 are two long and two shorter ])ristles. Lower posterior angle of 

 lateral portion of eighth tergite with four stout bristles and cephalad 

 of these two others. End of abdomen with eomparatively light 

 vestiture. 



The style is long, lu'coniing slender and slightly curved upward, 

 with a long bristle at apex and one on lower margin. Substylar flap 

 slender and with very large l)iistles at apex and .several short, stout 

 ones on lower maro-in. 



