TWO NEW SPECIES OF TRICHOGEAMMATID^. 



197 



varietal forms than those mentioned above are true " tempera- 

 ture " forms— i. e. that they can be produced regularly in all 

 members of any brood by the influence and within the Limits of 

 certain temperatures acting on all stages, or at least up to the end 

 of the larval stages, when already the direction of the ensuing 

 pupal developments is, in the case of these forms, predetermined 

 so far as to resist conversion by opposite influences acting on 

 the pupal stage. 



Thus the temperature limits within which V. urticce var. 

 falcoides (F. io var. mesoides) and V. urticce var. amploides 

 {V. io var. teloides) are reared exclusive one of the other (but 

 not exclusive of other forms of variation, the details of which 

 associate with either the falcoid or amploid characters) can be 

 given at 6-15^ C. and 20-40° C. respectively. The most gene- 

 ralized form of expression would read : not above 15° C. = var. 

 falcoides, and not below 20° C. = var. amploides. 



TWO NEW SPECIES OF TKICH0GEAMMATID7E FROM 

 THE UNITED STATES AND WEST AUSTRALIA. 



By a. a. Girault (The University of Illinois). 



One of the following two species extends the known limits of 

 the genus Ufens, Girault, recently described from the United 

 States, to West Australia. 



Genus Abbella, Girault. 

 1. Abbella nympha, sp. n. (normal position). 



Female. — Length, 0-65 mm. Moderate in size for the genus. 



The same as the type species of the genus (subjiava, Girault), but 

 differing from it as follows : More intensely yellow, not light greenish 

 yellow ; substigmal spot of fore wing obscure, only a faint cloud 

 being present under and against the stigmal vein ; antennae differing 

 in that the first funicle joint is slightly longer than wide, the second 

 joint globular, as long as wide, both joints not distinctly wider than 

 long, as in subjiava ; fore wings differing in having longer marginal 

 cilia, in being smaller and shorter, in bearing an oblique line of discal 

 cilia running back from the stigmal vein, the lino moderately short 

 and slightly curved, consisting of four or five cilia ; also in having 

 finer and denser discal ciliation. 



With the general appearance of Westwoodella aviericana (Ash- 

 mead), Girault. General colour pale cadmium yellow, the colour 

 uniform ; antennae concolorous, the legs pallid dusky yellowish, with 

 the distal tarsal joint dusky ; eyes and ocelli In'ight red ; fore wings 

 sliglitly fumated along their proximal halves, otherwise hyaline ; 

 venation concolorous with the legs. Abdomen having at least two 



