167 



makes it ordinarily impossible for the parasites to reach any 

 large percentage of tliem. It is the other class of enemies, 

 those which attack the maggot stage, which give promise of 

 being of valne in practical efforts to control these pests. The 

 insects described below are all of this type. Jn all of these 

 the egg is deposited in the maggot but the host is not thereby 

 prevented from completing its gTowth and forming its pupa- 

 riiim. In all these forms the adult parasite emerges from the 

 puparium of the host. 



The African insects here described were found ,;nd studied 

 while travelling for the Hawaiian Board of Agriculture and 

 Forestry searching for enemies of fruit flies. My travels were 

 interrupted at Cape Town liy an attack of malarial fever and 

 the observations upon dung fly parasites were mado while re- 

 cuperating there. Some insects of similar habits which have 

 accidentally entered the Hawaiian Islands and a Japanese 

 lehneumonid bred by Mr. Muir similar to one of the African 

 insects studied are here described : 



ICHNEUMONIDAE, Cryptinae, Stilpnini. 

 1. Atractodes Muiri n. sp. 



Radius arising a little beyond the middle of the stigma, areo'et open 

 at apex, eyes bare, second tergite without an impressed spiracular Hne. 



Length 8.5 mm., wing 6.5 mm. 



2 Black; mandibles in the middle, second joint of trochanters, 

 femora, and tibiae (basal third of hind tibiae infuscate), and 2d-5th 

 abdominal segments rufous ; wing base yellow ; wing grayish hyaline, the 

 nervure infuscate. 



Head not as wide as thorax, about twice as broad as long above, 

 nearly square as seen from in front; eyes subparallel, a little dtvergent 

 below ; malar space longer than the width of the base of the man- 

 dible ; genae broader below ; mandible punctured at base with the upper 

 tooth a little longer ; clypeus a little shining, rather sparsely but definitely 

 finely punctured, the anterior margin rounded, narrowly depressed ; face 

 more opaque, protuberent in the middle above the clypeus with strong 

 punctures separated by about their diameter, more shining and more 

 sparsely punctured along the sides ; genae nearly bare above, shining, 

 with some scattered punctures ; front similar to the face but the punc- 

 tures less impressed ; vertex similar to the genae : ocelli in a low 

 triangle, lateral ocelli about equidistant from the eye margin and from 



