08 E. T. CRESSON. 



D. Body black, abdomen marked or banded with red. 



30. Pompilus tropicus. 



Sphe.v tropicus, Linn., Syst. Nat. i, 9-45. Fabr., Ent. Syst. ii, 250. 

 Pompilus tropicus, Fabr., Ent. Syst. Supp. 250 ; Syst. Piez. 194. St. Farg., 

 et Serv. Ency. Meth. x, 181. Dahlb., Hym. Eur. i, 62. 

 St. Farg., Hym. iii, 434. 

 % 9 • — Black ; second abdominal segment with a more or less broad, 

 orange-yellow band, generally emarginate behind, and sometimes inter- 

 rupted down the middle; antennae shorter than the head and thorax: 

 anterior margin of the clypeus subtruncate ; posterior margin of the 

 prothorax angular ; wings blackish, subviolaceous, third submargiual 

 cell triangular. Length 6 — 8o lines. 



Hah. — Pennsylvania, Delaware, Georgia, Illinois, (Coll. Am. Ent. 

 8oc. and Mr. E. Norton). 



Seven 9 , four % specimens. 



31. Fompilas atrox. 



Pompilus atrox, Dahlb., Hym. Eur. i, p. fi.3. 



% 9 • Black; second abdominal segment with a more or less broad, 

 orange-yellow band, as in trojyicus ; antennae longer than the head and 

 thorax ; anterior margin of the clypeus deeply emarginate in 9 , 

 f^lightly so in % ; posterior margin of the prothorax arcuate ; wings 

 blackish, subviolaceous, third submarginal cell subquadrate. Length 

 7 — 11 J lines. 



Ifah. — Pennsylvania, Delaware, Maryland, Virginia, Illinois. (Coll. 

 Am. Ent. Soc.) ; Connecticut, Louisiana, (Coll. Mr. E. Norton). 



Twelve 9 , six S specimens. This species, though larger than tropi- 

 cus, resembles it closely, but is readily distinguished by the much 

 longer antennae, by the anterior margin of the clypeus being notched 

 in the middle, by the posterior margin of the prothorax being arcuate, 

 and by the shape of the second submarginal cell, which is subquadrate, 

 while that of tropicus is triangular. 



32. Pompilus marginatus. 



Pompilus marrjinntus, Say, Long's Second Expcd. ii, p. 333. (1824.) 

 Pompilus {Miscus) petiolatus, Say, Bost. Jour. Nat. Hist, i, p. 305. (1835.) 

 Female. — Black; first and second abdominal segments above yellow 

 or orange-yellow, more or less emarginate behind on the second seg- 

 ment ; the first segment is entirely black in fourteen specimens, with 

 a reddish spot or shade in twelve specimens, entirely yellowi.sh, or 

 nearly so, in five specimens, and in one specimen the reddish or yellow- 

 ish color is very obscure; anterior margin of the clypeus rounded or 

 subtruncate ; posterior margin of the prothorax subangular; wings vary 

 from subhyaline with a fuscous terminal margin (as described by Say 



