156 WILLIAM J. FOX. 



nearest eye-marsrin ; first joint of flagolliini alioiit as long as the two following 

 joints united, the four basal joints combined nearly twice as long as the six apical 

 joints united ; lateral tooth of pronotum stronger than in the female ; dorsulum 

 more strongly punctured ; middle segment coarsely striated, distinctly so on the 

 sides; fore femora somewhat produced at base beneath; first and second joints 

 of medial tarsi slightly curved and produced at apex-, the first joint a little longer 

 than the following two united ; punctures of the abdomen distinct, particularly 

 those on the first dorsal segment, the second ventral sparsely punctured ; marked 

 similarly to the ? , except that the scutellum is black and the abdominal mark- 

 ings are narrower; scape sometimes with a black spot; pubescence of front and 

 clypeus silvery; wings paler than in tlie 9- Length 8-12 mm. 



Occurs from Canada to Florida and through the Western States 

 to Washhigton, except those in the southwest on the Border. Pack- 

 ard, in liis description of the female, states, " second and third joints 

 next to terminal one of flagellum being dentate." This statement 

 is erroneous, as I have examined some of his examples. The fact 

 of the sex being female would discredit his assertion. That author 

 also, on page 84 of his work, in speaking of arcuatus, remarks that 

 " Say, in his description, does not mention the sex of the specimens 

 before him, but they must have been 9 ." This cannot be, inasnmch 

 as we find the following in Say's description, " sixth joint [of an- 

 tenme] arcuated, a little prominent inwardly at tip ;" this is dis- 

 tinctly a male characteristic. The males described by Cresson as 

 those of PacIatrdU are identical with this species. C. ho)iedH.'< Cres- 

 son, differs only in lacking the thoracic markings. 



8. Group rufifemur. 



This group is characterized chiefly by the broad, triangular, non- 

 excavated pygidium of the 9 , and by the fore tarsi of the S being 

 flattened and rather broadly dilated. The thorax is coarsely sculp- 

 tured in both sexes and the abdomen distinctly punctured. In the 

 % the fourth joint of the flagellum cvn-ved and has the appearance 

 of being strongly emarginate beneath, this joint is also somewhat 

 produced at apex beneath and the first, second and third joints are 

 more or less contracted basally beneath. 



28. Crabro 4lileotu!§> Cress. 



Crahro dUrctn.s Cresson, Proc. Ent. Soc. Phila., iv, p. 478. 9 % . 

 9 . — Head a little more finely and closely punctured than in bigeminus, the 

 space between hind ocelli about equal to that between them and the nearest eye- 

 margin ; dorsulum rather finely and closely punctured, closer than in higeminns ; 

 mesopleurae coarsely striato-punctate ; middle segment rather finely striated above 

 and behind, the sides veiy delicately striated ; abdomen finely and tolerably 

 closely punctured, the first segment most distinctly so; pygidium slightly de- 



