1897.] NATURAL SCIENCES OF PHILADELPHIA. 375 



pleurse not tuberculate, with an \- -shaped furrow ; petiole composed 

 of two joints ; wings subhyaline, apices broadly darker, second 

 submarginal cell subtriangular, narrowed more than one-half above, 

 the first recurrent vein received near the middle, the second near 

 apex. Entire insect deep black, abdomen velvety; face and 

 clypeus with sparse fuscous pile ; spot on tubercles and large one at 

 each side of apex of middle segment, bright silvery. Length 22 mm. 



$ . — Face and clypeus densely golden ; clypeus drawn out into a 

 median prominence, which is short and obtuse, and before which 

 the clypeus is visibly depressed ; space between hind ocelli nearly 

 equal to that between them and eyes ; dorsulum with rather dense 

 pale pile, and, in addition, with a short, erect, pale fuscous pubes- 

 cence ; thorax sculptured as in the 9 5 tegulse silvery anteriorly. 

 Length 22 mm. 



Chapada (March). Three specimens. Has the general appear- 

 ance of abbreviate/,. 



Sphex (Ohlorion) hemiprasinus Sichel. 



Chapada (October). Three specimens. 

 Sphex (Chlorion) cyaniventris Guer. 



One specimen ; same locality and date as the preceding. 



Sphex {Isodontia) nigrocaeruleus Tasch. 



Nine 9 , three S specimens. Chapada (March, April). 



Sphex {Isodontia) costipennis Spin. 



Five 9 , nine $ specimens; Chapada (February, March) ; 

 Maruru and Pedra Branca (April) ; Santarem. 



Sphex [Isodontia) laevipes n. sp. 



9 . — Black, with grayish pubescence ; face, clypeus, thorax be- 

 neath, hind coxse, an oblique line on sides of middle segment (some- 

 times absent) extending to insertion of petiole, silvery ; tegulse, legs 

 entirely or in part, petiole (the latter sometimes black) wine 

 colored ; wings fusco-hyaline, costal half much darker ; clypeus 

 bidentate, with long, sparse, pale hairs; eyes converging toward 

 mandibles, the latter bidentate ; space between hind ocelli nearly 

 equalling that between them and eyes ; first joint of flagellum not 

 quite as long as the two following united ; dorsulum and scutellum 

 with distinct, separated punctures ; middle segment rather coarsely 

 granulated ; the mesopleurce with coarse punctures ; legs compara- 

 tively scarcely spinose, spines of fore tarsi short; petiole about as 



