1919] Sturtevant — Species Closely Resembling Drosophila Melanogasier 155 



by Mr. A. M. Brown that led to the identification of D. simulans 

 as a distinct species. Males have, however, been obtained by using 

 D. melanogasier females that give what are known to students of 

 heredity as "non-disjunctional exceptions." A full account of 

 these experiments and a description of the hybrids will be pub- 

 hshed later.^ 



DESCRIPTIONS OF NEW TRYPHONIN^ OF THE TRIBE 

 CTENOPELMEMI (HYMENOPTERA; ICHNEUMONIDvE) .2 



By Miss Esther W. Hall, 

 Bussey Institution, Harvard University. 



Polyblastus fulvilinealis sp. no v. 



cf . Length 6 mm. Head wider than thorax, thickened behind 

 eyes. Malar line equal to one-half the base of clypeus. Distance 

 from ocellus to clypeus slightly longer than from eye to eye. 

 Front protruding below antennse, which are almost as long as body 

 and composed of 28 segments. First flagellar joint slightly longer 

 than scape and pedicel, four times as long as wide at apex. Four- 

 teenth segment about twice as long as wide and one-half the length 

 of first flagellar joint. Scutellum flat, margined. Pronotum 

 prominent. Parapsidals present anteriorly. Areolation complete. 

 Abdomen subsessile. Length of petiole two and one-half times 

 width of base; width at apex twice that of base. Third segment 

 twice as broad as long and one-fifth narrower than thorax. Carinae 

 with groove between and extending almost to apex. Base of 

 hind coxse to apex of femora longer than abdomen. Five teeth on 

 claws. Wings large, areolet small, petiolate, rhomboidal. Head, 

 except cheeks, finely punctate; thorax, except slightly rugulose 

 propodeum, sparsely punctate; abdomen smooth. 



Black. Rufous as follows: apical half of clypeus, collar, and 

 lower pleurae, propodeum, hind coxae and femora, outside of four 

 anterior femora. Antennae and hind tarsi dusky. IVIandibles 

 except teeth, underside of pedicel, remainder of fore legs, hind 



'It seems highly probable that the sterile "unisexual broods" of Drosophila reported by 

 Quackenbush (1910. Science, n. s. 32; 183-185) were hybrids between D. melanogasier and 

 D. simulans. 



2 Contributions from the Entomological Laboratory of the Bussy Institution, Harvard 

 University, No. 167. 



