530 PROCEEDINGS OF THE ACADEMY OF [Oct., 



the antennae; however, this fusion-segment is merely elongated and 

 does not show the elongate-conical shape of the segment in Crypteria 

 and the even more accentuated condition of Chionea. Specimens of 

 Chionea valga Harris before me show eight flagellar segments beyond 

 the fusion-segment, the basal ones short, becoming more and more 

 attenuated toward the tip of the organ. Therefore, in the reduction 

 of the antemial segments by the fusion of the basal flagellar segments, 

 Chionea also shows a very close relationship to Crypteria and Ptero- 

 chionea. I certainly think that Bergroth is right in surmising a 

 relationship between his Crypteria and the abnormal, wingless 

 Chionea, and Pterochionea may now be added to the list of possible 

 CTmmea-precursors. This interpretation would remove Chionea 

 from the neighborhood of Trimicra and Symplecta and place it at the 

 end of the Eriopterine series along with Cladura and the present 

 genus. 



The two winged genera of this group may be separated as follows: 



1. Antennae with the second segment enlarged, globular; the two 

 apical segments of the flagellum entirely distinct; cross-vein 

 r absent ; second anal vein very elongate, extending beyond 

 midlength of the radial sector; hypopygium with the pleural 

 pieces slender with two small, subequal appendages. (North- 

 western Palsearctic.) Crypteria Bergroth. 



Antennae with the second segment not enlarged; the two apical 

 segments of the flagellum fused; cross-vein r present; second 

 anal vein short, not reaching to the base of the sector; hypopy- 

 gium with the pleural pieces stout-cylindrical with a strong, 

 powerful dorsal appendage that is almost as long as the 

 pleurite. (Northwestern Nearctic.) Pterochionea gen. n. 



Pterochionea bradleyi sp. n. 



Antennae brown, of eleven segments; wings with cell Mi present; 

 male hypopygium strong and powerful. 



Male. — Length, 5 mm.; wing, 5.6 mm. Fore leg, femur, 3.6 mm.; 

 tibia, 3.8 mm.; hind leg, femur, 4.1 mm.; tibia, 4 mm. 



The species is described from alcoholic material. 



Rostrum short, light brown; palpi brown. Antennae dark brown; 

 Head yellowish brown. 



Thoracic dorsum dull yellow with indistinct darker stripes on the 

 praescutum. Pleura yellowish. Halteres pale. Legs with the coxae 

 and trochanters pale yellow; femora light brownish yellow, a little 

 darkened apically, the fore femora darker, being only a little paler 

 at the base; tibiae and tarsi brown. Wings nearly hyaline, the 

 stigma indistinct; veins dark brown, subcosta pale. Venation (Plate 



