122 ENTOMOLOGICAL SOCIETY 
A NEW SPECIES OF DONACIA. 
BY FREDERICK KNAB. 
A study of the Donacia material in the collection of the 
Illinois vState Laboratory of Natural History brought to light 
an interesting series of a species which could not be located 
by Mr. C. W. Leng's Revision of our species. 1 An attempt was 
made to locate this species with some of the many forms that 
have been described and relegated to the synonymy, but without 
satisfactory result. Finally a specimen was sent to Mr. Samuel 
Henshaw, Curator of the Museum of Comparative Zoology at 
Cambridge, Mass., with a request to compare it with the 
material in the LeConte collection. In his reply Mr. Henshaw 
wrote : " I consider it distinct from any in the LeConte collec- 
tion which contains all the species recognized by LeConte and 
The species belongs with subtilis in Mr. Leng's Group C, 
but is very distinct from any of the species denned in Mr. 
Leng's paper. Owing to its short thorax and rather broad 
and depressed form this species more nearly resembles the 
species of the cincticornis group, but the narrow mesosternum 
and the shorter legs and less swollen hind femora show its rela- 
tionship to subtilis. The specimens were taken upon bulrushes, 
so that in habits, too, it differs from the species of the cincti- 
cornis group which frequent pond lilies. 
Donacia curticollis n. sp. 
Female: length 9.5 mm. Form rather broad, subdepressed. Color: 
body beneath metallic green, the prothorax ferruginous-yellow; head 
green; thorax above golden green upon disc, anterior and basal margins 
ferruginous-yellow; elytra ferruginous-yellow with golden lustre; antennae 
dark, the basal segments with green lustre; femora ferruginous at base, 
the outer half metallic green; tib'iae and tarsi ferruginous, tinged with 
green. 
Head obsoletely tuberculate between the eyes, with a deep median 
groove; surface confusedly punctured, clothed with pale yellowish pubes- 
cence. Eyes prominent. Frontal lobes prominent. Antennae rather 
short, slightly over half the length of body; second segment very short, 
third slightly longer. Thorax straight-sided and without tubercles, 
broadening gradually to the front margin, half again as broad as long; 
surface shining, very finely wrinkled and confusedly punctured; anterior 
and basal margins broadly elevated, the front margin turned obliquely 
'Trans. Am. Ent. Soc., v, 18, pp. 157-176. 
