OF WASHINGTON. 
menopterologische Studien, published in 1856, and in which but two spe- 
cies are known, H. insignis and H. nobilis, both found in Europe and 
described by Forster in : Eine Centurie neuer Hymenopteren. 
The genus was dedicated to the well-known Irish Hymenopterist, A. H. 
Haliday, and belongs in the group Eupelmince. 
For years I have been vainly endeavoring to recognize the genus, but, 
until recently, unsuccessfully, as I failed to find it either in my collections 
or amongst the numerous chalcideous material that has passed through 
my hands. 
Recently, however, in casually going over a miscellaneous collection of 
microhymenoptera, assorting it preparatory to identification, I was both 
delighted and gratified to recognize a single specimen of this rare genus, 
collected the past summer at Harper's Ferry, Virginia, by my good friend, 
the President of our Society, Mr. E. A. Schwarz, labeled as having been 
captured June 19, and which I have brought with me to-night. 
It superficially resembles an ordinary Eupelmus, the structure of the 
head, antennae, and thorax being nearly identical ; but it is at once distin- 
guished from that genus and all other genera in the group by the dilated 
or broadly compressed posterior tibiae and tarsi a character that at once 
attracts attention, even on the most superficial examination. 
The middle legs are a little longer than usual, cylindrical throughout; 
the tibiae not dilated toward apex, nor is the first tarsal joint compressed 
and armed with teeth, as in other Eupelmids. The usual long apical 
tibial spur is, however, present, the thorax deeply impressed, as in Eupel- 
mus, while the abdomen is sessile, shorter, and more pointed. 
In testimony of my appreciation of the discovery, and as a slight token 
of my regard for the discoverer, I christen it in honor of our President 
and submit the following description : 
Halidea Sc/fwarzi, n. sp. : 
Length. 2 mm.; bronzy-green, the face golden-green; head, broad, 
closely, minutely punctate ; antennae, 13-jointed, black; the scape, dull 
metallic green, its length being two-thirds the width between the eyes, 
slightly dilated apically; pedicel longer than wide; first two joints of 
funicle small, narrowed, cylindrical, but slightly longer than thick; the 
joints beyond dilated, nearly as wide as long, densely bristly ; the club 
obliquely truncate; eyes large, oval, occupying the larger portion of the 
sides of the head, finely pubescent; thorax more than twice as long as 
wide, densely scaly, the disk deeply impressed; metathorax short, the 
hind margin golden-green; legs brown, the anterior pair dusky, the tarsi 
one-third or more longer than the tibiae ; middle pair paler brown, longer, 
and cylindrical throughout, the tibial spur long and white ; posterior pair 
brown-black, the tibiae and tarsi strongly dilated, pubescent; all coxae 
metallic green, the posterior pair being brighter and more of a golden 
color; abdomen sessile, acute ovate, not longer than the thorax, flat above, 
roundedly keeled beneath, bronzy-green, brighter beneath; ovipositor 
