382 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



Aleuroplatus, new subgenus. 



Pupa case flat, elliptical, oval, or subcircular, thoracic tracheal 

 folds ending on margin of case in a comb of teeth; vasiform orifice 

 small, usually transversely elliptic and without teeth upon its inner 

 caudal and lateral margins. 



Type. — Aleuroplatus (Aleuroplatus) quercus-aquaticae (Quaintance). 



KEY TO SPECIES OP SUBGENUS ALEUROPLATUS. 



1. Pupa case transparent whitish, never dark brown or black 2 



Pupa case not transparent whitish, but dark brown to black 3 



2. Marginal comb of thoracic fold very faint and composed of short rounded teeth. 



ficus-rugosae. 

 Marginal comb of thoracic fold very distinct and composed of long narrow teeth. 



transluddus. 



3. Marginal comb of thoracic fold composed of distinct differentiated teeth 4 



Marginal comb and thoracic fold either scarcely distinguishable or the teeth 



similar to marginal teeth 8 



4. Marginal comb of thoracic fold composed of one prominent tooth at base of 



prominent incision in the margin of case incisus. 



Marginal comb composed of more than one prominent tooth 5 



5. Marginal comb of thoracic fold composed of two prominent teeth gelatinosus. 



Marginal comb of thoracic fold composed of four or five rather prominent teeth. 6 



6. Suture between thorax and abdomen curved cephalad on each side beyond the 



third thoracic segment; body with moderately developed rhachis. .herhericolus. 

 Suture between thorax and abdomen not curved beyond the third thoracic seg- 

 ment; rhachis but little developed or absent 7 



7. Abdominal segments distinct; teeth of thoracic comb with clear areas at base. 



plumosus. 



Abdominal segments faintly indicated and visible only on middle of dorsum; 



teeth of thoracic comb without clear areas at base pictiniferus. 



8. Marginal comb of thoracic fold distinguishable, but the teeth little differentiated 



from adjacent marginal teeth 9 



Marginal comb and thoracic fold scarcely distinguishable 14 



9. Size very large, over 2.25 mm. long; dorsum with very distinct rhachis. 



sculpturatus. 

 Size medium, or small, less than 1.5 mm. long 10 



10. Dorsum somewhat arched possessing distinct rhachis cockerelli. 



Dorsum flat, without rhachis 11 



11. Suture between thorax and abdomen curved cephalad much beyond the third 



thoracic segment 12 



Suture not curved cephalad beyond or but slightly beyond the third thoracic 

 segment 13 



12. Thorax with two pairs of rather long dorsal spines validus. 



Thorax without such spines quercus-aquaticae. 



13. Suture curved slightly beyond third thoracic segment; color varying in different 



specimens from a yellow to a smoky brown, some individuals with a yellow 



submarginal area and a more or less completely brown disk variegatus. 



Suture not curved beyond third thoracic segment; color uniform brown . .cococolus. 



14. Shape elongate oval, greatest width across thorax ovatus. 



Shape nearly elliptical or oval with greatest width across the abdomen 15 



