160 U. S. NATIONAL MUSEUM BULLETIN 216 



clypeus definitely convex with its apex impressed and with a deep 

 median apical notch; frons black or concolorous with rest of head; 

 occipital carina complete, dipped a little on the midline, in a Philip- 

 pine species obsolete near the midline; hair on mesoscutum moderately 

 dense, evenly distributed; submetapleural carina complete; propodeum 

 rather short and convex, basally with or without median longitudinal 

 carinae; areolet triangular, oblique, receiving second recurrent vein 

 at its outer corner or sometimes (as in the Nearctic A. pronexus) 

 a little before its outer corner, sometimes the areolet lacking (as in 

 some Ethiopian species and occasionally in Nearctic specimens) ; 

 nervellus broken below the middle; first tergite short and broad, its 

 lateral and median longitudinal carinae rather strong; second tergite 

 with short, moderately strong, oblique grooves cutting off its latero- 

 basal corners; third and fourth tergites with distinct tubercles, their 

 apical impunctate band occupying about 0.2 their length; subgenital 

 plate usually completely sclerotized but sometimes with a median 

 basal membranous area; ovipositor straight, compressed, its apex as 

 in figures 330,i and 331, a (the point slender, usually concave above, 

 and the ridges of its basal teeth very oblique) ; ovipositor sheath 0.4 to 

 0.7 as long as front wing. 



Genotype: Charitopimpla hucostoma Cameron. It is our intention 

 that hucostoma be the type species of the new genus Acropimpla and 

 also to indicate that the unavailable name Selenaspis applies to the 

 same zoological group as Acropimpla. 



Most species of this genus are in the Oriental region and eastern 

 Palaearctic. The species we include in it are the two Nearctic species 

 treated below; the Ethiopian Hemipimpla alboscuteUaris Szepligeti 

 1908 and Selenaspis lucifugus Seyrig 1932; the European Pimpla 

 pictipes Gravenhorst 1829 and P. didyma Gravenhorst 1829; Pimpla 

 yezoensis Matsumura 1926, from Japan; Charitopimpla hucostoma 

 Cameron 1907, from the Oriental region; Pimpla latifoveata Cameron 

 1899, P. bicarinata Cameron 1899, Charitopimpla jlavoscutis Cameron 

 1907, and C. nigroscutis Cameron 1907, from India; Charitopimpla 

 nigrescens Cushman 1933, and C. uchidai Cushman 1933, from For- 

 mosa; and seventeen undescribed or undetermined species from the 

 Oriental region and eastern Palaearctic. All of these are new com- 

 binations in Acropimpla. Exeristes pulchella Morley 1913, and 

 Epiurus taiwanensis Uchida 1928, are synonyms of hucostoma (new 

 synonymies). 



The European species pictipes, an undescribed species from Japan, 

 and the two Nearctic species form a compact group, not all of which 

 may be specifically distinct. This group is more Scambus-Kke than 

 most species of Acropimpla in coloration, more swollen temples, and 

 more elongate body. 



