268 



7. All chitinizcd plates with several long and conspicuous bristles; 



apical respiratory tube short and stout (PI. XXXIX, Fig. 8) . . . 

 supcrba. 



— Chitinized plates with at most very inconspicuous bristles; apical 



respiratory tube very distinctly elongated and tapering apically.8 



8. Eobust species; basal abdominal segment with narrow transverse 



chitinized plates sp. 1 



— Slender species; basal abdominal segment with spot-like chitinized 



plates cinerea*. 



PUPAE 



1. Ventral abdominal segments each with 3 transverse series of 



spinules, the anterior and posterior marginal series compact, the 

 one on middle of segment consisting of 4 widely separated 

 spinules , minuta. 



— Ventral abdominal segments each with 2 transverse series of 



spinules, the widely separated median series and the compact 

 posterior marginal one 2 



2. Prothoracic respiratory organs as long as greatest width of thorax ; 



first 2 ventral abdominal segments beyond apex of wings each 

 with 2 spinules in median transverse series alternata. 



— Prothoracic respiratory organs much shorter than greatest width of 



thorax ; at least the second ventral abdominal segment beyond 

 apex of wings with 4 spinules in median transverse series 3 



3. Prothoracic respiratory organs with groups of openings, not with 



a continuous series on surface; second dorsal abdominal segment 

 with distinct apical transverse series of spines, the series on seg- 

 ments 3 to 7 with a pair of single long spines close to middle, and 

 another between these and lateral extremity of series, the latter 

 paired (PL XXXIX, Fig. 4) superba. 



— Prothoracic respiratory organs with continuous series of openings, 



not groups ; abdominal armature not as above 4 



4. First ventral abdominal segment beyond apices of wings with 2 



spinules in median transverse series albimaculata. 



— First ventral abdominal segment beyond apices of wings with 4 



spinules in median transverse series cinerea. 



Psychoda minuta Banks 



Psychoda minuta Banks, Can. Ent., Vol. 26, 1894, p. 331. 



Larva (PI. XXXIX, Fig. 7).— Length, 2.75-3 mm. Whitish 

 testaceous, apex of anal respiratory tube dark brown. 



Head distinctly longer than its greatest width; maxillae promi- 

 nent, their palpi protruded, fringed; antennae very minute. Pro- 



*See remarks in text under domestica. 



