86 
X. Genus CRESUS Leach. 
Cresus Leach. Zool. Misc., 111, 1817, p. 129. 
The characters distinguishing this genus are indicated in the table 
of genera. It is closely allied to both Amauronematus and Pteronus in 
the characters of the vertex, clypeus, and claws. The original descrip- 
tions of the two American representatives are reproduced without 
change. 
Creesus latitarsus Norton. 
1862. Cresus latitarsus Norton. Proc. Ent. Soc. Phila., 1, p. 199. 
1867. Croesus latitarsus Norton. Trans. Am. Ent. Soc,1, p.84. (Cat., ete., p. 54.) 
1881. Croesus latitarsus Packard. Bull.7, U.S. Ent. Comm., pp. 129, 184. 
1882. Cresus latitarsus Provancher. Nat. Can., x1u, p. 291. 
1883. Cresus latitarsus Provancher. Faun. Ent. Can. Hym., p. 740. 
1885. Croesus latitarsus Dimmock. Psyche, Iv, p. 286. 
1888. Cresus latitarsus Jack. Psyche, v, p. 41. 
1890. Croesus latitarsus Packard. 5th Rept. U.S. Ent. Comm., p. 485. 
1893. Croesus latitarsus Dyar. Can. Ent., xxv, p. 246. 
1894. Nematus (Croesus) latitarsus Dalla Torre. Cat. Hym., I, p. 233. 
Female.—Antenne as long as body, black; body shining, blue black, a crescent- 
shaped elevation between antennex; clypeus notched; labrum, mandibles and palpi 
piceous; mesothorax with confluent longitudinal punctures; legs black, the anterior 
pair piceous toward tip; posterior trochanters and basal half of all the tibiw white; 
posterior tibiz enlarged and very much flattened toward the tip; first joint of tarsi 
still wider, compressed, longer than remaining four joints together, its edges ele- 
vated to a rim on both sides; wings hyaline, a little smoky below stigma; a dot in 
middle of both second and third*submarginal cells. 
Massachusetts (Harris’s Coll.), Pennsylvania (Coll. Am. Ent. Soc.). (Smithsonian 
Institution). 
(Three females.) Quite rare. Wild cherry, August 16. 
Bred by Mr. Walsh from larvie feeding on birch. 
Creesus laticulus Norton. 
1869. Cresuslaticulus Norton. Trans. Am. Ent. Soc., 1, p. 368. (Cat., ete., p. 222.) 
1894. Nematus (Crasus) laticulus Dalla Torre. Cat. Hym.,1, p. 232. 
Female.—Length 0.48 inch; black; tegule, a spot on sides of basal plates and of 
second and third segments of abdomen whitish; apex of mandibles and the legs fer- 
ruginous, with the apex of hinder femora, the apical two-thirds of their tibie and 
the most part of the first tarsal joint blackish; antennz very long (0.36 inch), quite 
slender; each ocellus at the head of a pentagonal basin; a protuberance between 
antenne, nasus incurved; some scattered subobsolete oval punctures on the head 
and mesothorax; scutel polished; pleura dull, but not punctured; tergum with deli- 
cate cross striw; abdomen slender, cylindrical; hinder tibiw one-half longer than 
first and second, somewhat enlarged, twice as wide as the others, with a deep chan- 
nel down the upper side; all the joints of their tarsi enlarged and flattened, the 
first joint widest, but not as wide as tibiw, the patelle long and white, the claws 
with a strong inner tooth; wings ample, hyaline; nervures piceous; stigma black; 
first transverse submarginal nervure obsolete, except its rudiments near the nerves; 
second recurrent nervure received near the transverse neryure. 
Two females. Massachusetts (Coll. Am. Ent. Soc.), Virginia (Peabody Institute, 
Salem ). 
