AMERICAN HYMENOPTERA. 163 



88. laetus, BrulU', Hym. p. 303; Cress. Trans. Am. Ent. Soc. i. p. 300. 

 pnratus, Say, Eost. Jour. Nat. Hist, i, p. 228, S . 



//a6.— Can., N. H., Mass., N. Y., N. J., Pa., Del., Md., Ya. Thi.s 

 is our commonest species. The second, third and fourth segments of 

 abdomen are yellow, more or less broadly banded at base with black ; 

 the postpctiole is always yellow at tip -occasionally the yellow on fourth 

 segment is interrupted so as to form two spots sometimes reduced to 

 dots, or entirely wanting; the mesothorax has often two short lines 

 or a spot on the disc, and the metathorax varies from almost entirely 

 yellow to entirely black. Length % .GO — .65 inch. 



89. mimicus, Cress. Trans. Am. Ent. Soc. i, p. 300, % . 



Hah. — Can., Mass., N. Y., Ct. This is smaller than laetus, with the 

 abdomen more convex, the postpetiole broader and nearly smooth and 

 the apical segments more or less distinctly fulvous at tip ; otherwise it 

 is colored much the same. Length % .45 inch. 



90. zebratus, Cress. Trans. Am. Ent. Soc. i, p. 299, $ ; iv, p. 156, % . 

 Hah. — 111., Ga., Tex. This pretty little species has a broad yellow 



band at apex of all the abdominal segments; face, orbits, line before, 

 wings, spot on disc of mesothorax, scutellums, large mark on sides of 

 pleura, posterior half of metathorax except median black spot behind 

 and most of coxa), also yellow ; legs fulvo-ferruginous; wings tinged 

 with yellowish; the flagellum of antennae 9 has a white aunulus, that 

 of S is entirely black; coxal scopa $ distinct. Length S 9.35 — .-10 

 inch. 



91. parvus, Cress. Proc. Ent. Soc. Phil, iii, p. 159, % . 



Hah. — Mass., N, Y., Va., 111. This little species is about one-half 

 the size of Isttus, and is colored almost exactly like that species and 

 seems to be subject to the same variation in color. The mesothorax 

 has sometimes two short lines or a spot on its disc ; the metathorax 

 is often more or less varied with yellow and the fourth abdominal 

 segment is sometimes entirely black ; the gastrocoeli are deep and 

 well marked. Length % .30 — .40 inch. 



92. vescus, Prov., Nat. Can. ix, p. 9, S . 



Huh. — Can., N. H., N. Y. This is the same size as parvus and 

 resembles that species very much in color, but is at once distinguished 

 by the subobsolete gastrocoeli. It much resembles some well marked 

 specimens of paratus, Say. Length % .30 — .40 inch. 



