178 WILLIAM J. P^OX. 



between tlieni and the nearest eye-nuirjjin ; punctuation of clieeks very dense ; 

 dorsuhun ratlicr strongly punctured ; episternum and epimerum mesothoracis and 

 sides of middle segment distinctly striated ; fore femora flattened toward the 

 base, clothed witli long white hair, as is also the mesosternum ; fore and medial 

 tarsi with shorter hair within, their first joint flattened; the four anterior legs 

 are unusually slender in comparison to the hind pair, and are entirely yellow ; 

 abdomen witli all the dorsal segments maculated except the last ; no yellow on 

 scutellum or postscutellum. Length 9 11 mm. 



Illinois ; Texas. It is in my opinion very doubtful if the two 

 forms described by Packard and by myself above, are really sexes 

 of the one species. They contrast remarkably when placed side by 

 side, the short, stout form of the female and the male with its long, 

 slender build ; and moreover their character of sculpture is so dif- 

 ferent. The female seems to difter but slightly from that of ('. argus 

 wdiich follows in the next group because of the characters of the % . 

 This fact leads me to believe that the 9 of cingalafn.s has yet to be 

 discovered, and that the $ described above and by Packard belongs 

 to one of the two preceding groups. Nothing definite can be deter- 

 mined, however, until the sexes are worked out better. 



57. Crabro cognatus n. sp. 



9 . — Head about as in hiJtiris, but is somewhat more distinctly punctured and 

 on the front the striation is more evident; first joint of flagellum a little shorter 

 tliau the two following joints united ; pronotum not strongly developed above as 

 in hilaris, shorter, not so distinctly dentate; punctuation of the mesopleurge 

 coarser than in the species mentioned, and tends to punctato-striate on the epis- 

 ternum mesopleuralis ; epist«rnum and epimerum metiithoracis more or less 

 striated ; middle segment less coarsely ridged than in hilaris. the fovese conse- 

 quently less marked, the central longitudinal channel above shallower, broader 

 and widened more basally; medial and hind tibia; and tarsi more strongly 

 spinose ; abdomen about as in hilaris. Black ; colored as in the species mentioned, 

 except that the episternum mesopleuralis and apical portion of the hind tibia* is 

 black, as are likewise all those parts which, in hilaris. vary from black to yellow- 

 ish ; ventral abdominal segments 2. 3 and .sometimes 4 with a small, yellow, lateral 

 spot; markings on first and fourth dorsal segments usually separated medially, 

 those on the second and third always widely so; wings subhyaline, darker at 

 apex ; clypeus, cheeks, and thorax beneath more densely with silvery pube.scence. 

 Length 8 9.5 mm. 



% . — Scape of antennsB compressed, broader by far at apex than at base, widest 

 medially, however : flagellum short, rather stout, not thickened medially, nar- 

 rowed a little to the apex, distinctly fringed beneath, the first joint about one- 

 third longer than the second ; sides of middle segment coarsely striated, except 

 medially, where they are sparsely and finely punctured (sometimes the strise are in- 

 distinct) ; remainder of middle segment more coarsely sculptured than in the 9 ! 

 mesosternum clothed with long, dense, white hair, that on the base of fore femora 

 shorter and sparser, the fore and medial tarsi with shorter and stiSer white hair 

 within ; last two dor.sal segments of abdomen not strongly punctured, the ultimate 



