STAPHYLIXID^E. 55 



present (fossil) species at a much slighter angle, while the branches them- 

 selves are both firm, gently and regularly curving lines, without the sinu- 

 osity figured by Burmeister; the lower is accompanied throughout its course 

 by an almost equally distinct vein-like thickening (apparently a fold of the 

 membrane) given by Burmeister only near the margin of the wing; the sub- 

 sequent nervules can not clearly be made out. The abdomen is compara- 

 tively slender, shaped much as in 1'. cyanipennis, thinly villous, the terminal 

 lateral appendages nearly as long as the last segment, slender, tapering on 

 the apical third but bluntly rounded at tip, clothed rather sparsely with long 

 and slender bristles; the median appendage of the male by no means as in 

 /'. <-//<n/i/ i/i/i*, but very large and subtriangular, nearly as broad at base as 

 the apex of the last segment, with convex lateral margin and appearing like 

 a segment (as it really is) rather than as an appendage, which it resembles 

 in the same sex of /'. rt/<i>ti/>riniix, where it is lanceolate with concave sides. 



Length (not including terminal appendages), 12.25 mm.; breadth, 2.8 

 mm.: length of aiitenn;e, 2.5 mm.; of hind legs, .">."> mm.; of lateral anal 

 appendages, 1 mm. 



Florissant, Colorado: eight specimens. Nos. 4. ",42, 70S2, 923!), 9H40, 

 11265, 124XG, 13145, 13C30 and 13C31. 



PHILONTHUS INVELATI-S sp. nov. 

 I'l. VI, tigs. it. 10. 



Head subquadrate, broader than long, tapering rapidly behind the eyes 

 to a somewhat constricted -neck, the surface apparently smooth; the eyes 

 rather large, not prominent, the mandibles as in /'. marculiilus or rather 

 stouter; the antenna- not reaching beyond the middle of the thorax and 

 not very stout, the three basal joints of nearly equal length and twice as 

 long as broad, the fourth and fifth obpyriform, a little longer than broad, 

 the apical ones broader than long. Prothorax apparently about equally 

 broad and long, tumid and largest in the middle, smooth, with a few scattered 

 long bristles. Legs as in /'. marcidulus, but the tibiae rather stouter and 

 very heavily spined. Elytra about as long as the prothorax and villous. 

 Abdomen rather slender, equal except the last two segments, with long, 

 straight, slender, lateral, spinous hairs; last two segments tapering rapidly 

 to a rather pointed tip; lateral anal appendages long and slender, gently 

 tapering and blunt tipped. The body is generally black or nearly so, but 



