32 THE HESSIAN FLY IN THE UNITED STATES. 
metanotum finer than those on the head, pronotum, and mesoscuturn, those on the 
nietanotuni being deeper; metanotum with an indication of a median carina. The 
abdomen is oval, convex above, flattened below, glabrous, hut very finely shagreened. 
The hind tibiae have but one apical spur, and the hind trochanter has two very 
minute tooth-like projections below. General color black ; antennal scape yellowish, 
pedicel and flagellum brown to blackish, pedicel often yellowish below; head and 
thorax with a bluish, green metallic reflection; all coxa? black with metallic reflec- 
tions ; all femora black or dark brown, with yellowish tips ; all tibiae and tarsi honey- 
yellow. Wings perfectly hyaline; wing veins very distinct, dark brown in color; 
spurious veins more distinct than in M. subapterus. Abdomen black with a yellowish 
spot varying in size above and below at base. 
Female. — Averages in size a little larger than the male, from which she differs prin- 
cipally in the antenna?, which are short and have a slight clavate tendency; the 
funicle joints increase slightly in length from 1 to 6; club short and obliquely acu- 
minate; scape short, light yellow-brown in color; flagellum brown; club lighter in 
color than the remainder of the flagelluin; pile very short and fine. 
Described from 4 males, 10 females. 
Differs from all other described species of the genus in the combination of the 
pale scape, hyaline wings, and flattened abdomen. 
Bccotomus subapterus -Riley. (Fig. 3.) 
Pteromalus .' fulvipes Forbes. 
Wingless male. — Length varies from 1.58 to 2.74 mm. Antennae inserted a little 
below the middle of the face, their bases close together, 
but still distinctly separated; scape reaching to the 
ocelli; flagellum short, finely pilose, club oval, acu- 
minate, flattened laterally; joints of the funicle sub- 
equal in length, joint 1 a trifle longer than broad, the 
rest increasing very slightly in width to joint 6, which 
is as wide as long. Cheeks well rounded; ocelli in a 
curved line, middle ocellus indistinct; head consider- 
ably broader than thorax, densely and finely punctate. 
Pro- and mesonotum with punctation similar to that 
of the head; metanotum rounded, with somewhat 
larger and deeper punctures. Abdomen ovate, acumi- 
nate, not flattened, perfectly glabrous. Color: Head 
and thorax with a dark-greenish metallic luster; bulla 
of antenna- black, scape and pedicel honey-yellow; 
flagellum yellow-brown, often with a darker metallic 
tinge, especially at the joints, causing the flagellum in 
Fig. 3,—Bceotomus subapterus some instances, particularly in the smaller individuals, 
(after Riley). to appear dark; pile whitish; all legs honey-yellow, 
coxae very slightly metallic at base; tarsi, and some- 
times distal end of tibia j , whitish ; abdomen black ; penis (often extruded to a consid- 
erable length) brown. 
Female {winged and wingless). — Length varies from 1.8 to 2.8 mm.; average wing 
expanse, 3.75 mm. Differs from male in the following respects: The antennae are 
more clavate, the sixth funicle joint slightly broader than long; the flagellum is 
always black, with a slight metallic tinge, and the pedicel is usually tipped with 
black at its distal end; the pile is much shorter and finer than in the male. The 
femora and the tibia? are in general of a darker brown, in which case the knees and 
the distal third of the tibiae are whitish. The metallic luster of the thorax is more 
subdued, and the abdomen has the characteristic female notch when seen from the 
side. The wings are perfectly hyaline, and the veins are onty faintly tinged with 
yellowish; the spurious veins are very faintly perceptible. 
