xn.D, 6 Baker: Ichneumonoid Parasites 295 



of its surface coarsely reticulate-rugose except for two large, de- 

 pressed, laterobasal arese. Spiracle elliptical, not raised ; lateral 

 areae with blunt lateral prominences slightly below and behind 

 the position of the toothed prominences in Gyroneuron. Disk of 

 mesopleura with a very broad, impressed, centrally crenulate, 

 oblique groove. 



Radial cell reaching apex of wing. Radius inserted at basal 

 two fifths of the long and rather narrow stigma. First abscissa 

 of radius less than half length of second ; second cubital cell more 

 than twice as long as wide; first transverse cubitus oblique, 

 second vertical and decolored. Recurrent vein inserted a short 

 distance from apex of first cubital cell. Submedian cell longer 

 than median by nearly length of transverse median. Parallel 

 vein inserted at lower third, sinuous a little before insertion. 



Abdomen sessile, longer than head and thorax together, beyond 

 first segment narrowly elliptical in outline; second tergite as 

 long as wide apically or longer, remainder broader than long; 

 first and second tergites and basal half of third tergite medially 

 carinate; sutures not depressed, but basal surfaces of fourth, 

 fifth, and sixth tergites strongly depressed. Hind tibial spurs 

 slender and longer than fourth tarsal joint, slightly curved and 

 naked. 



Type, Macrostomionella philippinensis sp. nov. 



This genus belongs to the group of genera including Cysto- 

 mastax, Macrostomion, and Pelecy stoma. In Macrostomion 

 only has a species been described from the Oriental Region. The 

 present genus is perhaps nearest to Cystomastax, described from 

 Peru, but it differs in the structure of the metanotal spiracles, 

 the radial vein, the submedian cell, and the first and second 

 abdominal segments. The grouping of a series of genera on 

 modified maxillary palpi is, I believe, unnatural; but it will 

 have to be continued, in part, until the species and genera 

 formerly described shall have been reexamined and more fully 

 studied and characterized. It seems certain that the modified 

 palpi have appeared in several distinct genetic lines. 



Synopsis of the species. 



a\ Posterior ocelli nearer to occipital carina than once their diameter; 

 abdominal tergites finely, longitudinally reticulate-rugose; stigma 

 little narrowed to a blunt apex; second transverse cubital oblique. 



philippinensis sp. nov. 



a'. Posterior ocelli distant from occipital carina by one and tviro-thirds times 

 their diameter; abdominal tergites very strongly and coarsely, longi- 

 tudinally anastomose-rugose; stigma rapidly narrow^ed to an acute 

 apex; second transverse cubital vertical similis sp. nov. 



