20 
32 (1) Bothriothorax virginiensis, n. sp. 
Female. — Length, 1.63 mm ; wing expanse, 3.96 mm ; greatest width of fore wing, 
0.69 mm . Head rather wider than thorax ; lower face densely rugose, but not densely 
punctulate; front and apex densely covered with large, shallow, round punctures; 
mesouotum punctured in a similar manner. Stigmal vein given off from suhmarginal 
just before it reaches costa; postmarginal very short; antenna) regularly clavate; 
the pedicel is longer than the first funicle joint, which is a little longer than broad ; 
the remaining fuuicle joints increase in width and slightly in length; club slightly 
longer than fifth funicle joint. Color, metallic greenish- black; anteuna) jet black; 
all coxa) metallic; all femora metallic, brownish at tip; front and middle tibiae 
brownish-yellow; hind tibiae greenish-black; all tarsi, yellow. 
Described from 1 2 specimen collected, September 18, 1881, at Arling- 
ton, Va. [C. V. R. Coll.] 
The European Bothriothorax clavicornis is parasitic on the onion 
maggot, larva of Anthomyia ceparum, and hence, from the remarkable 
uniformity of habit in this subfamily, we should expect to find that B. 
virginiensis is parasitic upon some Anthomyia here. A. ceparum has not 
been found to be parasited, however, in this country. 
33. (±) Bothriothorax peculiaris, n. sp. 
Female. — Length, l.75 mm ; expanse, 4.25 mim ; greatest width of fore wing, 0.7 mm . An- 
tennae short, joints not well defined; scape not reaching to top of head; pedicel twice 
as long as thick, longer than first fuuicle joint; funicle joints subcyliudrical, increasing 
in diameter from 1 to 6: joint 6 as thick as long; club as long as the three preceding 
joints together, much flattened and sharply truncate at tip in a somewhat oblique 
line. Fore wings slightly ciliate at tip; hind tibia) somewhat compressed laterally, 
mesoscutellum uniformly punctate. General color blue-green ; b;isal half of antenna! 
scape h-mey-yellow ; distal half black above, yellowish below ; flagellum black, clothed 
with short dense black hairs; front femora black, with green luster, yellow at tip 
middle and hind femora honey-yellow; front and middle tibhe honey-yellow: hind 
tibiae black ; all tarsi honey-yellow. 
Male. — Same size and proportions as $. Antenna) much longer and more slender 
Than with 9 ; pedicel twice as long as thick ; joint 1 of funicle three times longer than 
thick and one-third longer than pedicel; the rest of fuuicle joints subequal in length, 
about as long as pedicel, well separated and increasing slightly in thickness. Club 
flattened, truncate, and nearly as long as the two preceding funicle joints together. 
In coloration similar to 9 , except that the antenna) and front femora are honey- 
yellow throughout. 
Described from 3 $ 's and 10 $ 's. 
These were all, with two mutilated specimens, bred in November from 
a single Syrphid larva found on an oak leaf at Arlington, Va. The 
larva was honeycombed, as are the hosts of Copidosoma, and all of the 
parasites issued through two holes cut apparently by two of the most 
enterprising individuals. [Dept. Agr. and G. V. II. Coll.] 
The characters of Bothriothorax will have to be revised. Mayr has 
described the male of B. clavicornis only, and while he shows that the 
$ antennae of this species differ (p. 82), he rejects Foerster's statement 
that the club of the $ antenna has "eine schief gestutzte, fast heil- 
formige Gestalt," like the 9 . He says, however, that his varying speci- 
