PARASITIC WASPS OF BRACONID SUBFAMILY EUPHORINAE E 
cells are confluent and that the second cubital cell is open outwardly. 
This does not seem to be the case, however. The present writer has 
seen a specimen, in the collection of the Hungarian National Museum 
at Budapest, which is labeled ‘“bucephalus M., Coll. Marshall (Trini- 
dad), Aridelus’’, and is undoubtedly either the holotype or a cotype of 
Aridelus bucephalus. This specimen has the first cubital and first 
discoidal cells separated, the first abscissa of cubitus being complete 
although weakly pigmented; and it has the second cubital cell closed 
outwardly by a rather indistinct hyaline second intercubitus, as is 
frequently the case in specimens of Helorimorpha. The species is 
unquestionably congeneric with the genotype of Helorimorpha. 
Accordingly, it is necessary to place Helorimorpha, and the various 
names previously synonymized with it, as synonyms of Aridelus. 
The following combination of characters will distinguish the genus: 
Head large, transverse to subquadrate, completely margined behind; temples 
broad; eyes bare, short oval; clypeus large, broad; maxillary palpi 6-segmented; 
labial palpi 4-segmented; frons with a sharp median carina; antennae always 
18-segmented; scape short; flagellum submoniliform; thorax covered with a 
coarsely reticulate sculpture, or with enormous punctures that are usually con- 
tiguous; notauli not distinct; dorsal face of propodeum short; posterior face long, 
strongly declivous and longitudinally concave medially; anterior wing with first 
cubital and first discoidal cells separated; three cubital cells, the second small 
and much narrowed toward base of wing; radius composed of three abscissae, the 
second very short; radial cell, on wing margin, not longer than stigma; recurrent 
vein interstitial with first intercubitus or nearly so; medius well developed; 
nervulus a little postfurcal; first abdominal segment very long and slender, 
subeylindrical, inserted low between hind coxae, a little curved and slightly 
broadened behind the spiracles, which are well beyond the middle; remainder of 
abdomen more or less pyriform, subcompressed apically; fused second and third 
tergites very large, extending nearly to apex of abdomen and overlapping beneath, 
dorsaliy convex and not acute at sides; ovipositor sheaths rather broad, sub- 
exserted. 
The only published record of a definite host association for a 
species of Aridelus concerns A. coffeae (Brues). Recently Wilkinson 
(17) has reported the rearing of this parasite by R. H. LePelley, in 
Kenya Colony, Africa, from the pentatomid Antestia lineaticollis Stal, 
an important pest of coffee. In conversation with the present writer 
Dr. LePelley stated that the parasites emerged from both nymphs and 
adults of the pentatomid. Eig 
The genus is widely distributed, all the major zoogeographical 
regions being represented among the 15 described species. These 
species appear to be remarkably similar in structure and sculpture, 
but they differ rather decidedly in color, ranging from entirely 
testaceous to entirely black. The Nearctic fauna contains three 
forms which appear to be separable only by color characters and may 
be merely color varieties of the same species. They may be dis- 
tinguished as follows: 
Key to the Nearctic Species of Aridelus 
Head black; remainder of body testaceous__------------ (1) melanderi (Brues). 
Thorax entirely black; head and abdomen testaceous_(2) nigrithoraz, new species. 
iead; thorax, and. abdomen testaceous_-_.-=--2-.---_--—- (3) fisherz (Viereck). 
(1) ARIDELUS MELANDERI (Brest new combination 
Helorimorpha melanderi Brues, Ent. News 19: 363, 1908. 
The holotype, which is in the collection of C. T. Brues, is from 
Woods Hole, Mass. A specimen in the National collection was taken 
at Harrisburg, Pa. 
