1897.] NATURAL SCIENCES OF PHILADELPHIA. 377 



Sphex flavipes Sm. 



One 9 , six male specimens of the var. Iheringii Kohl. Chapada 

 (February, March). 



Sphex ichneumoneus Linne. 



Four specimens of the typical form from Santarem (February) 

 and Maruru (April). Three of the var. dorsalis from same locali- 

 ties. Over thirty of the var. sumptuosus collected from February to 

 April. 



Sphex duhitatus Cress. 



The geographical distribution of this species is extended consider- 

 ably by three specimens in the present collection, collected at Cha- 

 pada (February, March) and Corumba (April). There is also a 

 specimen in the collection of the American Entomological Society 

 marked Mexico. 



Four specimens, which may be the $ of this species, have the 

 pubescence denser and more golden, particularly on head in front ; 

 antennae rather long and slender, first joint of flagellum about as 

 long as second and three fourths of third joint united ; face much 

 narrower than in ichneumoneus; petiole about as long as second and 

 third hind tarsal joints united ; legs more or less black ; abdomen 

 with more or less black blotches above ; last ventral plate triden- 

 tate apically, the central tooth prolonged, with a carina which runs 

 almost to base of segment, laterally the segment bears a bunch of 

 long yellowish hairs, somewhat concealing the lateral teeth. Length 

 17-18 mm. 



Corumba and Pedra Branca (April). 



Sphex ferrug-ineipes n. sp. 



$ . — Head and thorax black, with pale, not dense pubescence ; 

 face, clypeus at sides, line on pronotum, sides of dorsulum and spots 

 on sides of thorax and at apex of middle segment with silvery pile ; 

 mandibles, except apex, tegula?, legs, except coxse, and base of tro- 

 chanters, and abdomen, except petiole, entirely, or in part, bright 

 red ; eyes but slightly converging beneath ; face somewhat narrower 

 than in ichneumoneus; clypeus convex, emarginate medially, hav- 

 ing the appearance of being bidentate, or entire, front distinctly 

 punctured; space between hind ocelli about equal to that between 

 them and eyes; dorsulum with rather strong separated punctures, 

 those of mesopleurse finer and evener; middle segment above with 

 a transverse, indistinct striation ; tarsal comb well developed, the 



