1906.] NATURAL SCIENCES OF PHILADELPHIA. 497 



finely barbed ; pseudostigmatic organ quite long, barbed, not thickened 

 at tip. Abdomen globose, with four, rather long, barbed bristles 

 behind ; genital apertm-e scarcely its length in front of the larger anal 

 opening; sternal structure as in 0. bipilis, the hind furrow running into 

 middle of genital opening, a transverse furrow in front of this, and in 

 front of latter is a short furrow on each side. Legs quite long and 

 slender; femora III and IV very broad, and margined below, II moder- 

 ately broad, I pedicellate; tarsi III and IV with two or three stout, 

 barbed, spine-like bristles; a long, barbed bristle from trochanter III; 

 three claws. 



Length .4 to .7 mm. 



Several examples from Falls Church, Va. This is strictly congeneric 

 with 0. bipilis of Europe. 

 Oppia canadensis n. sp. 



Color, pale yellow. Cephalothorax with lamellae like 0. spinipes, but 

 they are much longer, nearly one-half the length is free; the superior 

 bristles are rather longer; the pseudostigmatic organs about the same. 

 The abdomen has four long bristles behind, the submedian pair plainly 

 longer than in 0. spinipes; the abdomen above and below is slightly 

 roughened ; genital opening its length in front of larger anus, latter with 

 two bristles each side, and a pair behind; sternal structm-e as in 0. 

 spinipes; hind coxae large and broad ; a long bristle from trochanter III ; 

 the spine-like bristles on hind tarsi are rather more slender than in . 

 spinipes. 



Length .7 to .85 mm. 



Several from Ottawa, Canada, (Harrington.) 

 Oppia montana n. sp. 



Color, pale yellowish. Cephalothorax with lamellae as in allied 

 species, fully one-third of length free; superior bristles very long, 

 barbed; the barbed pseudostigmatic organ is longer than in 0. spinipes. 

 The abdomen is globose, with six short hairs behind, the superior 

 median pair longer than the others, but all much shorter than in 0. 

 spinipes and 0. canadensis; genital aperture one and one-fourth its 

 length in front of the somewhat larger anus, sternal structure as in 

 allied species ; legs long and slender, the barbed bristles not very stout ; 

 a barbed bristle on trochanter III. 



Length .5 mm. 



From Franconia, N. H. (Mrs. A. T. Slosson.) 



Cepheus lamellatus n. sp. 



Color, red brown, legs paler, lamellae pale brown, reticulate. Cephal- 



