198 PROCEEDINGS ENTOMOLOGICAL SOCIETY
From the pair secured by Mr. Greene the position assumed by
certain parts of the genitalia may be described as follows: The
hypopygidium fits over the knob at the base of the sheath while
the cochlearii grasp the side of the same knob in the manner of
a ball and socket joint. The position of the other parts cannot
be seen.
HYPARGYRICUS FUMIPENNIS (NORTON).
Mr. J. C. Crawford captured a pair of this species in coitu.
on Plummer's Island, Md., April 22, 1915, and notes that they
were facing in the opposite directions.
EXPLANATION OF PLATE XXII.
Pteronidea ventralis (Say). A and B Two perfect individuals, male
and female, mating. C, D and E female which has lost her flagelli
being "courted" by three males. In D and E the female is mating with
the male at the left. (Photographs by H. S. Barber at Plummer's Island,
Md., on leaves of Salix niger).
AMETASTEGIA GLABRATA (FALLEN), A HOLARGTIC SAWFLY.
BY S. A ROHWER
Branch Forest Insects, Bureau of Entomology, Washington, D. C.
The "dock sawfly," Ametastegia glabrata (Fallen), has been
known in America for many years and has heretofore been con-
sidered as a native species. Whether it is a native holarctic
species or whether it was introduced from Europe may never be
decided, but it is very certain that the American and European
specimens are morphologically identical and inasmuch as they
have the same habits it is believed the following synonymy is
justifiable. The European synonymy is copied from Enslin.
AMETASTEGIA GLABRATA (FALLEN).
Tenthredo glabrata F&lten, Svensk. Vet.- Akad. Handl. 1808, p. 108.
Tenthredo (Allantus) agilis Klug, Magaz. Ges. Naturf. Fr. Berlin, VIII,
1814, p. 208.
mthredo (Allantus) rnfipes Lepeletier, Monog. Tenthred. 1823, p. 81.
letastegiafulvipes A. Costa, Rend. Acad. Sc. Napoli, vol. 21, 1882, p. 198.
oma Norton, Proc. Boston Soc. Nat. Hist., vol. 9, 1862, p.
Tr. Amer. Ent. Soc., vol. 2, 1868, p. 165; Provancher, Nat. Can.,
. 10, 1878, p. 165; Fauna ent. Canad., Hyin. 1883, p. 214; Jack,
OF WASHINGTON, VOLUME XVII, 1915 199
Can. Ent., vol. 25, 1893, p. 183; Chittenden and Titus, Bui. 54, U. S.
D. A. Bur. Ent. 1905, p. 40-43; Fletcher, 33d Ann. Kept. Ent. Soc.
Ontario 1902 (1903) p. 86; 34th 1. c. 1903 (1904), p. 70; Harrington,
33d Ann. Rept. Ent. Soc. Ontario 1902 (1903), p. 100; Webster. H. L.,
Jn. Econ. Ent., vol. 1, 1908, p. 310.
gylogaster abnormis Provancher, Addit. fauna Can. Hyrn. 1885, p. 10;
Dyar, Tr. Amer. Ent. Soc.', vol. 25, 1895, p. 311-312; Can. Ent., vol.
27, 1895, p. 340; Jn. N. Y. Ent, Soc., vol. 5, 1897, p. 199.
TWO NEW SPECIES OF SIMULIUM FROM TROPICAL AMERICA.
BY ALLAN H. JENNINGS, Bureau of Entomology.
During 1913 a commission headed by Dr. Louis W. Sambon
was sent from England to the West Indies and adjoining regions
to investigate pellagra and its manner of transmission. Through
invitation the writer was able to accompany this expedition with
the special object of investigating the insects that might have
a bearing on the transmission of the disease. Special attention
was given to Simulium and among the material collected were
the two new species described below. I am much indebted to
Mr. Knab for assistance in this connection. Details of the biol-
ogy of these species will be published in another place.
Simulium samboni new species.
Female. Occiput, frons and face black, densely light silvery gray
pollinose. Antenna; rather stout, brownish yellow, darker distally, I lie
first two joints honey yellow and smooth, the others clothed with short
whitish pile. Palpi blackish. Mesonotum bright orange-ferruginous,
with four narrow, pollinose, grayish-silvery stripes, the miter ones at the
lateral margins, the inner pair sinuate, extending nearly to the scutellum
and dividing the disk into three nearly equal parts; vestiture of fine, evenly
distributed golden hair-scales not forming regular series. Scutellum
paler than mesonoturn, honey yellow; transverse hair-scales on the disk
golden, the marginal bristles black. Postnotum ferruginous. IMeiine
ocher-yellow, strongly infuscated on the mesosternum. Abdomen sub-
cylindrical, black and gray; segments '2 to "> black and with the margins
and two longitudinal stripes gray, thus delimit ing three series of large
black spots; sixth segment shining, mostly gray. Anterior co\;r yellow,
the others infuscated. Legs bright ocher-yel|o\\ , the hind pair with the
apices of the femora infuscated and the distal halves of the tibia- blackish,
their basal halves with whitish luster: front tarsi blackish, the first joint
tinged basally with luteous; mid tarsi with the first joint pale, its distal
fourth blackish, the second joint pale on basal half, the last three joints
wholly blackish; hind tarsi with the first joint pale, infuscated along its
lower margin and on apical third, the second joint pale on basal half, the
last three joints wholly blackish; appressed hair-scales partly pah- ami
partly black, in correspondence with the ground-color. Claws simple,
thickened at base. Wings hyaline, the venation normal; thick veins pale
yellow; anal field without iridescent spot. Halteres pale yellow. Length:
Body about 1.5 mm., wing 2 mm.