408 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES’ VOL. 13, No. 18 
Type in the U. 8. National Herbarium, no. 655,222, collected at Lomo 
de Loro, Cayo Romano, Camaguey, Cuba, October 21, 1909, by J. A. 
Shafer (no. 2644). Another Cuban specimen, Shafer 2815, collected at 
Cayo Guajaba, probably represents the same species, and shows a close 
group of three pinnae that may have come from near the middle of the leaf, 
these pinnae 64 cm. long by nearly 2 em. wide. ‘The same sheet has the end 
of a leaf with subterminal pinnae 34 em. by 5mm., and terminal pinnae 28 
em. by 2 mm., with margins closely infolded, and the midvein thickened 
and prominent beneath; rachis-bristle 28 em. long, less than 1 mm. wide. 
The very narrow pinnae, simple tertiary branches, small fruits, thin 
endocarp, and small oval hilum may be considered as the diagnostic features 
of this species. The slender pedicel of the fruits, projecting below the everted 
petals, is also peculiar. The petals exceed the pedicel in P. sargentii and in 
P. insignis, and are about equal in P. saonae. 
ENTOMOLOGY .—On the identity of a European chalcidoid parasite 
of the alfalfa leaf-weevil. A. B. GAHAN, Bureau of Entomology, 
U. 8S. Department of Agriculture. (Communicated by S. A. 
ROHWER.) 
The following note is published at this time for the reason that 
the European Chalcidoid dealt with is one of those parasites which 
the United States Department of Agriculture Bureau of Entomology 
is about to attempt to establish in the state of Utah for the purpose 
of aiding in the natural control of the destructive alfalfa leaf-weevil 
Phytonomus posticus Gyllenhall. 
FAMILY, PTEROMALIDAE, 
GENUS PERIDESMIA FOERSTER 
Type of the genus—Isocyrtus (Trichomalus) aquisgranenis Mayr, by present 
designation. 
The genus Peridesmia was described! by Foerster, in a table of genera, 
without included species. The description was apparently based upon the 
male sex only. Foerster’s original specimens afterward came into the pos- 
session of G. Mayr and were described? by him under the name of Jsocyrtus 
(Trichomalus) aquisgranensis. Mayr considered Trichomalus Thomson a sub- 
genus of Isocyrtus Walker and Peridesmia a synonym of Trichomalus. His 
description of 7’. aquisgranensis included both sexes. 
Although, strictly speaking, Mayr did not include aquisgranensis in 
Peridesmia it is apparent that this species should be considered the genotype 
of that genus and it is herewith so designated. In order that the type of 
Peridesmia may be definitely fixed the male of Mayr’s description is desig- 
1Hym. Stud. 2:65. 1856. 
2 Verh. zool.-bot. Ges. Wein. 1903 :394. 
