16 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.76 



lack of oblique grooves on tergites 2 to 4. Following the second 

 alternate of the first couplet it runs, because of the median carina 

 of the propodeum, to Tropidobracon Ashmead (p. 139) and agrees 

 fairly well with all the characters assigned to that genus. From 

 apparently all species hitherto assigned to Microhracon it differs by 

 the abdominal sculpture. 



Female. — Length 4 mm. 



Head strongly transverse, the temples sharply convexly sloping; 

 eyes bulging, nearly hemispherical; face fully a half wider than 

 length of eye ; malar space a half longer than basal width of mandible 

 and subequal to width of mouth opening; antennae as long as body, 

 slender, tapering from before middle; first joint of flagellum nearly 

 three times as long as thick and very slightly longer than second, all 

 other joints much longer than thick, those near apex fully twice as 

 long as thick. Thorax short ovate, smooth and polished; notauli 

 distinct; scutellum flat, fovea foveolate; propodeum with a median 

 carina, high at apex, but not reaching base ; radius far before middle 

 of stigma; alar areolet rather short, first intercubitus and second 

 abscissa of radius about equal in length ; hind tarsus slightly shorter 

 than tibia, basal joint as long as rest combined, third and fifth equal. 

 Abdomen broad with a median ridge on tergites 2 to 6, originating 

 in a triangular embossed area at base of second and becoming weaker 

 toward apex, each of these tergites except second with a subapical, 

 transverse, more or less distinctly foveolate farrow, sutures foveo- 

 late, second and third longitudinally rugose, third with oblique 

 foveolate grooves basally; fourth to sixth opaque punctate; tri- 

 angular area of first tergite elevated subapically, coarsely rugose 

 behind elevation, smooth before; tergites beyond sixth much less 

 heavily chitinized; ovipositor about a fourth longer than body, 

 slender. 



Head and thorax testaceous; antennae blackish, scape and pedi- 

 cel reddish; wings hyaline, venation brown, tegulae stramineous; 

 front and middle legs stramineous, apices of tarsi blackish ; hind leg 

 testaceous, coxa somewhat piceous above; tibia fuscous toward apex, 

 apical joint of tarsus black; abdomen piceous basally, yellowish 

 white apically; first tergite testaceous basally, very narrowly whitish 

 at apex; second and third tergites laterally and the third apically 

 whitish ; tergites 4 to 6 narrowly piceous basally ; sheath stramineous, 

 blackish at base and apex, pubescence black. 



Male. — Median ridge of abdomen very faint; only first five ter- 

 gites heavily chitinized and sculptured, the sixth smooth polished and 

 without subapical groove ; tergites 4 and 5 longitudinally striate but 

 more finely so than 2 and 3 ; white color confined to narrow apical 

 and lateral bands on tergites 2 to 5. 



