AMERICAN IIYMENOPTERA. 105 



fourth segment; sometimes all the markings of the abdomen are very 

 indistinct; beneath fuscous, immaculate. Length 41 — 5 lines. 



Var. % — Black ; antennae, prothorax, legs, except coxai, and abdo- 

 men, ferruginous ; head marked and colored as in the normal % ; pos- 

 terior margin of the prothorax yellowish; scutellum at tip and sides 

 ferruginous ; post-scutellum and metathorax marked as in the 9 ', tar- 

 si yellowish-ferruginous ; basal margin of all the abdominal segments 

 narrowly black, that on the third and fourth segments followed by a 

 continuous yellow band, very narrow and subobsolete on the fourth 

 segment; beneath ferruginous, varied with dusky. Length 6 lines. 



Ildl). — Mass., Conn., Penn., Del., (Coll. Am. Ent. 8oc. and Mr. K. 

 Norton). 



Five 9 ; three % specimens. This is also au exceedingly variable 

 species. 



40. Pompilus navus, n. sp. 



Ff'ma/e. — Fusco-ferruginous, sericeous; head broad, the orbits much 

 })roader in front, yellow; clypeus ferruginous, yellowish on the sides, 

 the anterior margin truncate; mandibles ferruginous, dusky at tips; 

 palpi yellow; antenna? ferruginous, paler beneath, dusky above from 

 beyond the middle to the tip; prothorax ferruginous, margined later- 

 ally and posteriorly with yellowish, the disk and a spot on each pos- 

 terior angle black, the posterior margin angular; rest of thorax black; 

 the tegulae, a quadrate spot on the posterior middle of the mesothorax, 

 ferruginous; an ovate spot at each side of the scutellum near the in- 

 sertion of each posterior wing, the post-scutelluin, a cuneiform mark 

 on each side of the pleura, all yellow ; metathorax smooth and round- 

 ed above and behind, with a small spot on each side just behind the 

 posterior wing, a broad subapical band, constricted in the middle, and 

 a narrow band at the extreme tip, interrupted in the middle, yellow ; 

 wings fusco-hyaline, tinged with yellowish, with the costa towards the 

 tip broadly fuscous, with a purple reflection ; marginal cell narrow, 

 wing-cells as in intcrniplu^;, posterior wings subhyaline ; legs bright 

 yellow, most of the coxae and the femora, except tips, blackish-fuscous; 

 anterior coxaj with a large, irregular yellow spot in front, the interme- 

 diate pair with a faint yellowish mark on each side at tip, the posterior 

 with a yellow line behind : posterior femora with a yellow stripe be- 

 neath ; tips of the four posterior tibiae and tips of the tarsal joints fus- 

 co-ferruginous; tibia) and tarsi with numerous short spines; abdomen 

 oblong-ovate, subdepressed above, fusco-ferruginous, base of the first 

 segment, a band at the base of the second and third segments, broader 



TRANS. AMER. ENT. SOC. (14) JUNE, 18G7. 



