108 bulletin: museum of comparative zoology. 



Platybracon fortis, sp. nov. 



Type and Paratype. — M. C. Z. 9,057. Solomons: Fulakora. W. 

 M. Mann. 



Later two additional females were received by Dr. Mann from Mr. 

 Chas. Bignell, collected at Fulakora. 



9 . Length 11-14 mm. Similar to the preceding but with the pro- 

 jecting ridge below the base of the antennae much more highly devel- 

 oped and projecting as far forward as the mandibles when seen in 

 profile. The raised portion of the first abdominal segment is also 

 broader in proportion to its width, only a little over twice as long as 

 broad. 



It is possible that this species may be only a well-marked form of the 

 preceding. 



Dr. Mann tells me that all the Platybracon which he obtained were 

 flying about felled trees in the forest, so that it is probable that the 

 members of the genus are parasitic on the larvae of wood-boring 

 insects. 



Iphiaulax (Atanycolus) bignelli, sp. nov. 



Type. — M. C. Z. 9,058. Solomons: Isabel, Fulakora. Charles 

 Bignell. 



9 . Length 16 mm., ovipositor 20 mm. Black; the head yellow 

 except ocellar area; pro- and mesothorax, scutellum and four anterior 

 legs fulvous; wings black, the stigma fulvous on basal half; clear 

 spot below stigma present, but not very prominent. Head one third 

 broader than thick, rounded behind, the temples nearly as broad as the 

 eyes. Face rugose, opaque; malar space one third as long as the eye; 

 no keel between antennae; frontal depression with a narrowly v- 

 shaped median elevation. Pro thorax above very finely punctate; 

 mesonotum with distinct furrows anteriorly, smooth and polished; 

 scutellum finely punctate behind: metathorax with a few fine scat- 

 tered punctures, shining. First abdominal segment one half longer 

 than wide at apex, with a high ridge at each side on the basal third 

 enclosing a deep impression; behind the spiracle this ridge curves 

 down to form a lateral carina which is bounded internally by a crenu- 

 lated furrow, disc of segment strongly elevated, smooth and shining, 

 without carinae; medially behind with a rounded rugose area. Second 

 segment with a finely, irregularly striated median field anteriorly de- 



