OF WASHINGTON, VOLUME XVIII, 1916 185 



ing it with betulella one thing is noted to distinguish the two 

 genetically. The radial sector is always absent in betuella. 

 In some specimens of betulcecolens it is however very faintly 

 indicated. In the species alni described in this paper the radial 

 sector is absent normally and the wing is very similar to that of 

 betulella. In some specimens, however, this vein is indicated 

 in much the same way as in betulcecolens. In the other two 

 species the vein is sometimes strongly indicated and sometimes 

 very faintly indeed. Considering this variation in the presence 

 of the vein the writer feels that it can hardly be considered a good 

 character on which to distinguish two genera. He therefore 

 makes Siphonocallis a synonym of Calaphis. 



Wilson (1910) in his description of the genus Calaphis when 

 speaking of the antennae, gives as a character " sixth about one- 

 half the length of the spur." While this character holds for the 

 type species it is evidently a specific character for it does not 

 hold true for any of the other species, even for alni, which is 

 undoubtedly very close to betulella. If this character were con- 

 sidered, a new genus would have to be erected for each species 

 included in the present paper. 



The characters of the genus may be given as follows: 



Antennae longer than the body, slender, and armed with short spine 

 like bristles; segment six with the unguis much longer than the base; 

 antennal tubercles prominent, vertex armed with a few hairs; wing veins 

 more or less bordered with black and with the radial sector absent or 

 faintly indicated; cornicles short, somewhat tapering, broadened at base; 

 cauda knobed; anal plate bilobed; both cauda and anal plate with numer- 

 ous long stout hairs. 



A. Unguis of segment VI nearly six times as long as base; antennae 



uniform dusky or black; media not much thinner than other veins 

 of wing alni n. sp. 



B. Unguis of segment VI about five times as long as base; antennae 



alternately banded with yellow and black; media much thinner 

 than the other veins of wing castaneoides n. sp. 



C. Unguis of segment VI about four times as long as base; antennae 



uniform dusky or black; media much thinner than the other veins 

 on the wing castaneae Fitch. 



D. Unguis of segment VI between two and three times as long as base: 



(1) Head and thorax longitudinally striped with black. All 



wing veins heavily bordered with black. . .betulella Walsh. 



(2) Head and thorax not so striped; wing veins not heavily 



bordered with black. , . betulaecolens Fitch. 



