19 
Mesonotuni and pleurae opaque, with very dense and fine 
punctures ; antenna; short, tapering decidedly toward tip ; 
head more or less triangular and with long, projecting 
labium ; stigma narrow, tapering posteriorly, lengthened ; 
sheath rather thick and stout. IX. Amauronematus Knw. 
Last ventral segment of male excavated at tip, not obtusely 
triangularly produced; sheath of female very broad or the 
posterior tibise and tarsi thickened. 
Posterior tibia* and tarsi very broad and flattened. 
X. Croesus Leach. 
Posterior tibia' and tarsi not flattened. 
Posterior tibiae and tarsi thickened, tibiae externally 
with longitudinal furrow XI. llolcocneme Knw. 
Posterior tibia' and tarsi simple; sheath very thick and 
stout XII. Nematus Jur. 
Claws with short tooth within tip, tooth projecting nearly at right 
angle. 
Clypeus emarginate. 
A^ertex with distinct pentagonal area. 
XIII. P achy nematus Knw. 
Vertex without pentagonal area. XIV. Micronematm Knw. 
Clypeus truncate. 
Pentagonal area more or less distinct ; eighth dorsal segment 
carinated, subproduced : sheath simple ; elongate species. 
XV. Li/gao nematus Knw. 
Pentagonal area wanting; sheath with distinct scopa; 
first transverse cubital frequently wanting ; short, ovate 
species XVI. Pristiphora Latr. 
Claws simple, without branch or tooth. 
XVII. Gymnoni/chns gen. nov. 1 
Anterior wings with divided radial cell. 
Lanceolate cell petiolate XVIII. Dineura Dahl. 
Lanceolate cell contracted XIX. Hemichroa Steph. 
I. Genus CLADIUS Illiger. 
Cladiu8 111. Fauna Etrusca, 2d ed., p. 27, 1807. 
Cladius pectinicornis Fourcroy. Entom. Paris., II, p. 371, 1785. 
Cladius isomera Norton. Proc. Bost. Soc. Nat. Hist., vm, p. 223, 1861. 
Tbe only representative of this genus in this country is the well- 
known enemy of the cultivated rose, described as new by Norton 
under the name C. isomera. An examination some years since of 
Norton's species in comparison with the European G. pectinicornis indi- 
cated at once the identity of the two. The common European enemy 
of the rose had evidently been early imported with rose plants into 
New England, and the attention of Harris and Norton was drawn to it 
at a time when comparisons were out of the question, and it was very 
naturally described as a new species. For a full account of its habits, 
with figures, see Insect Life, vol. V, p. 6. 
1 From yvj.iv 6$, naked, and ovv£, claw. 
