20 
32 (1) Bothriothorax virginiensis, n. sp. 
Female.—Leneth, 1.63™™; wing expanse, 3.96™™; greatest width of fore wing, 
0.69™™, Head rather wider than thorax; lower face densely rugose, but not densely 
punctulate; front and apex densely covered with large, shallow, round punctures; 
mesonotum punctured in a similar manner. Stigmal vein given off from submarginal 
just before it reaches costa; postmarginal very short; antennwe regularly clavate; 
the pedicel is longer than the first funicle joint, which is a little longer than broad ; 
the remaining funicle joints increase in width and slightly in length; club slightly 
longer than fifth funicle joint. Color, metallic greenish- black; antennx jet black; 
all coxve metallic; all femora metallic, brownish at tip; front and middle tibix 
brownish-yellow; hind tibize greenish-black ; all tarsi, yellow. 
Described from 1 2 specimen collected, September 18, 1881, at Arling- 
bon, Via.’ [C. VR. Coll] 
The Buropean 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. (2.) Bothriothorax peculiaris, n. sp. 
Female.—Length, 1.75™"; expanse, 4.25™™; oreatest width of fore wing, 0.7". An- 
tenn short, joints not well defined; scape not reaching to top of head; pedicel twice 
as long as thick, longer than first funicle joint; funicle joints subcylindrical, increasing 
in diameter from 1 to 6; joint 6 us 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, 
mesoscitellum uniformly punctate. General color blue-green; basal half of antennal 
scape honey-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 tibiz honey-yellow; hind 
tibie black; all tarsi honey-yellow. 
Male.—Same size and proportions as 9. Antenne 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 funicle 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 Q, except that the antenne and front femora are honey- 
yellow throughout. 
Described from 5 2’s and 10 4’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 C. V. R. Coll.] 
The characters of Bothriothorax will have to be revised. Mayr has 
described the male of B. elavicornis only, and while he shows that the 
é antenne of this species differ (p. 82), he rejects Foerster’s statement 
that the club of the é antenna has “eine schief gestutzte, fast heil- 
formige Gestalt,” like the 2. Hesays, however, that his varying speci- 
