NORTH AMERICAN HYMENOPTERA. 
61 
plate not reticulated; wings hyaline, nerviires, stigma and tegulse piceous; legs 
rather stout, apical joints of tarsi ferruginous; first segment of abdomen closely 
and rather finely punctured, second with the punctures finer and more dense, 
depressed at base and apex, third and following segments finely and feebly punc- 
tured, especially towards apex, appearing impuuctate, apical margins of segments 
1-5 with narrow fasciae of white pubescence. Length 10 mm. 
One female, taken June 11th, on flowers of Physalis. 
Dedicated to Dr. S. W. Williston. 
C'. Iieuclierse 9 - — Black, shining; clypeus rough with coarse punctures; 
lahrum smooth, with a faint impression on each side and commonly one in the 
middle; mandibles rufo-piceous at tips, flagellum black, .sometimes dull testa- 
ceous beneath ; thorax ratlier finely and closely punctured, sparsely on the disc, 
clothed with short, thin, pale fulvous pubescence; scutellum shining and im- 
puuctate anteriorly. strongly punctured behind, enclosure of metathorax shining) 
with single transverse series of coarse reticulations, which are sometimes nearly 
obliterated ; sides of posterior face of metathorax sparsely punctured with coarse, 
shallow imuctures ; wings hyaline, nervures and stigma dull testaceous, second 
submargiual cell narrowed one-half to marginal; tegulse black, punctured; legs 
slender, black, clothed with pale pubescence, apical joints of tarsi ferruginous, 
claws equally cleft; abdomen closely and rather finely punctured, base with thin 
pale pubescence, apical margins of segments 1-5 each with a rather close fascia 
of white pubescence; segments 2-5 have blackish pubescence on the disc, the 
sixth with appressed brownish hairs. Length 9-11 mm. 
% . — A little longer, more pubescent, clypeus finely punctured, lahrum smooth, 
or with only a faiut median depression ; thorax more closely, and abdomen more 
finely punctured, tarsi paler, abdominal fascim thinner, second submarginal cell 
narrowing more strongly to marginal. Length 10-12 mm. 
Thirty-five females, twelve males, taken May 18th and 31st, and 
June 11th, on flowers of Heucliera hispida, Zhia aurea and Poly- 
tmiia nuttallii. On the first named plant it is very abundant, being 
the exclusive pollinator of the flower. The female comes for honey 
and pollen, the red grains commonly filling her scopie. The male 
visits the flower for honey, but is generally seen flying about the 
flowers in search of the female. 
C. eiiloplii 9 -“Black; clypeus rough, strongly punctured, with a median 
longitudinal depression; labrum with a small pit on basal middle and one or two 
faint depressions on each side; flagellum dull ferruginous at tip; prothoracic 
spine concealed by pubescence ; mesothorax closely and rather strongly puuc- 
tui’ed, except on the disc, which is sparsely punctured, smooth and shining, the 
thorax above clothed with short, rather thick fulvous pubescence, except on the 
di.sc, which is bare; disc of metathorax with a single transverse series of suh- 
quadrate pits, lateral faces of posterior plate reticulated with fine lines; wings 
hyaline, nervures, stigma and tegulm piceous; legs slender, posterior tarsi dull 
ferruginous, first segment of abdomen rather sparsely and finely punctured, 
second more closely and finely jniuctured, third and following segments with 
minute, feeble punctures, making them appear almost impuuctate; base and 
