xn.D, 5 Baker: Ichneumonoid Parasites 291 



constricted. Hind tibial spurs as long as fourth tarsal joint, 

 rather strongly curved and naked. Ovipositor very short ; hypo- 

 pygidium very large, deeper than sixth segment, and as long as 

 fifth and sixth tergites together. 



Type, Colastomion abdominalis sp. nov. 



The abdomen in this genus resembles that of Colastes Haliday, 

 but other features are distinctive. 



Colastomion abdominalis sp. nov. 



Head fulvous; interocellar area black; antennae piceous; palpi 

 ochraceous; thorax ferruginous, postscutellum darkened, tegu- 

 lae ochraceous; metanotum black; legs ochraceous, hind coxse 

 black, except at tips ; abdomen ochraceous belov^, tergites except 

 lateral margins, and ovipositor, apically black; hypopygidium 

 discally piceous. Wings slightly obscured, stigma and veins 

 piceous. 



Female, length, 6 millimeters; ovipositor very short, not 

 exceeding abdomen by 0.25 millimeter. 



Head viewed from above with vertex back of eyes roundly 

 swollen beyond continuation of eye margin; vertex smooth, ex- 

 cept near ocelli; ocellar area, except posteriorly, surrounded by 

 radiating ridges, which do not reach the eyes ; vertex not rapidly 

 narrowed caudad, length of exposed cheek margin greater than 

 distance between posterior ocelli and eyes; ocelli farther from 

 eyes than from each other and twice as far from occipital carina 

 as from each other. Face subquadrate, broader than long, inner 

 margins of eyes parallel; surface shining, minutely rugulose, 

 medially carinately elevated just below antennae ; mouth opening 

 narrow, its upper margin nearly horizontal; eyes within very 

 slightly emarginate at antennae. Head viewed from side with 

 face strongly and roundly bulging, malar space narrower than 

 cheek; cheek broad, slightly narrowed above; vertex outline 

 strongly raised just back of ocelli; eye outline ovate; maxillary 

 palpi long, extending beyond tegulae, second article as long as 

 next two together. 



Mesonotum smooth, shining, notauli very strong and deeply 

 impressed, minutely crenulate anteriorly, very coarsely crenulate 

 posteriorly, where the crenulae converge and become confluent. 

 Scutellum anteriorly with two ovate foveae, rugose within and 

 separated by a sharp carina ; disk of scutellum small and smooth. 

 Metanotum coarsely reticulate-rugose throughout, basal third 

 with a median carina, which splits posteriorly to form a large 

 diamond-shaped area; spiracle circular, on a distinctly raised 

 prominence. Metapleura shallowly rugose posteriorly, disk 



