86 
X. Genus CR(ESUS Leach. 
Croesus Leach. Zool. Misc., in, 1817, p. 129. 
The characters distinguishing this genus are indicated in the table 
of genera. It is closely allied to both Amauronematus and Pteronvsin 
the characters of the vertex, clypeus, and claws. The original descrip- 
tions of the two American representatives are reproduced without 
change. 
Crcesus latitarsus Xorton. 
1862. Cra-sus latitarsus Norton. Proc. Ent. Soc. Phila., I, p. 199. 
L867. Crcesus latitats us Norton. Trans. Am. Ent. Soc. i, p. 84. (Cat., etc., p. 54.) 
1881. Croesus latitarsus Packard. Bull. 7, IT. S. Ent. Comm., pp. 129, 184. 
1882. Croesus latitarsus Provancher. Nat. Can., xiii, p. 291. 
1883. Croesus latitarsus Provancher. Faun. Ent. Can. Ilym., p. 740. 
1885. Crasus latitarsus Dimmock. Psyche, iv, p. 286. 
1888. Croesus latitarsus Jack. Psyche, V, p. 41. 
1890. Crasus latitarsus Packard. 5th Rept. U. S. Ent. Comm., p. 485. 
1893. Croesus latitarsus Dyar. Can. Ent.. XXV, p. 246. 
1894. Xematus (Croesus) latitarsus Dalla Torre. Cat. Hym., I, p. 233. 
Female. — Antenna as long as body, Mack: body shining, bine Idack, a crescent- 
shaped elevation between antenna' ; clypeus notched; labruin, mandibles and palpi 
piceons; mesothorax with confluent longitudinal punctures; legs black, the anterior 
pair pieeons toward tip; posterior trochanters and basal half of all the tibia* white; 
posterior tibise 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 larva- feeding on birch. 
Croesus laticulus Norton. 
1869. Crcesus laticulus Norton. Trans. Am. Ent. Soc, n, p. 308. (Cat., etc, p. 222.) 
1894. Xematus (Crcesus) laticulus Dalla Torre. Cat. Hym., i, p. 232. 
Female. — Length 0.18 inch; black; tegnhe, 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 tibia) and 
the most part of the first tarsal joint blackish; antennae very long (0.36 inch), quite 
slender; each ocellus at the head of a pentagonal basin; a protuberance between 
antenna', nasns incurved; some scattered snbobsolete oval punctures on the bead 
and mesothorax; scutel polished; pleura dull, but not punctured ; tergum with deli- 
cate cross stria 1 ; abdomen slender, cylindrical; hinder tibiae 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 tibia), the patellae 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 nervure. 
Two females. Massachusetts (Coll. Am. Ent. Soc), Virginia (Peabody Institute, 
Salemj . 
