MCNEILL REVISION OF THE TRUXALIN^E OF NORTH AMERICA. 269 



collected in the same locality. It does not seem to have been reported 

 elsewhere imless it proves to be identical with the following species 

 which is, I think, very probable. I have, however, too few specimens 

 of this species to determine the matter positively. 



2. Eremnus scudderi, Bruner. 



Aiilocara scudderi, Bruner, 1889. Proc. U. S. Nat. Mus., XII, 63. 



Aulocara scudderi, Townsend, 1893. Ins. Life, VI, 30. 



Aulocara scudderi, Blatchley, 1894. Can. Ent., XXVI, 217. 



Philobostroma pan'a, McNeill, 1891. Psyche, VI, 64. 



As noted above, this species is likely to prove a synonym of E. de 

 arum. One variety of this species has the verte.x usually broad be- 

 tween the eyes with the anterior margins bounded by carin^e which 

 meet at an angle much greater than a right angle even in the male. 

 Ordinarily a structural difference of this character would indicate spe- 

 cific distinctness, but as this si)ecies seems to exhibit considerable vari- 

 ations in this respect, I think it not advisable to name it. I have 

 received this variety from Prof. G. P. Gillette under the name of Au- 

 locara scudderi, Bruner, and the form with the narrower vertex under 

 the name Dociostaurus coiorade/isis. Both forms being named by 

 comparison with specimens determined by Mr. Bruner. 



Hab, Montana to Illinois, extending northward into British 

 America and southward to New Mexico. It is said by Mr. Bruner to 

 be a very common species west of the Mississippi. It is probably 

 very rare eastward. I have found it in a few localities near Moline, 

 111., where it seems to be confined to a few sandy hilltops along the 

 Mississippi river. 



XXX. STIRAPLEURA, Scud. Figs. 30a, 30b, 30c. 



Vertex narrow, not exceeding half the short diameter of the eye, 

 horizontal or slightly declivent, deeply sulcate with high lateral walls 

 which meet at an acute angle in front and form a sub ellipse or a sub- 

 hexagon open behind where there is always some trace of a median 

 carina. The lateral foveols are rhomboidal once or twice as long as 

 broad. The frontal costa is acuminate above, regularly divergent down- 

 ward and sulcate throughout. Viewed from the side, the face is slightly 

 convex and nearly perpendicular or moderately oblique. The antenna 

 are filiform short, scarcely exceeding the head and pronotum in length 



[Pboo D. a. N. S., Vol. VI.] 34 [January 22, 1897.] 



