26 BULLETIN 826, IT. S. DEPARTMENT OF AGRICULTURE. 



6. More or less distinct antennal tubercles present; oviparous female with 



secondary sensoria CalapMs. 



No distinct antennal tubercles present ; oviparous female without secondary 

 sensoria 7. 



7. Anal plate slightly indented, sometimes almost entire; no apterous vivi- 



parous forms developed Chromaphis. 



Anal. plate distinctly bilobed; apterous viviparous forms common Myzocallis. 



. Genus CALAPHIS Walsh. 



Plate IV, S, IT. 



1863. CalapMs Walsh, Proc. Ent. Soc. Phila., v. 1, p. 301. 



1913. Siphonocallis Del Guereio, Redia, v. 9, p. 293. 



1913. Callipterinella Van der Goot, Tijdschr. voor Ent., v. 56, p. 118. 



Walsh erected his genus CalapMs for his betulella, a species which 

 lacks the radial sector in the wing, and on this character he based 

 his genus. Del Guereio based his Siphonocallis on betulaecolens 

 Fitch, distinguishing it from his conception of the genus Callipterus, 

 which conception, however, was not according to type. A study of 

 betulaecolens shows that in all respects, with the exception of the radial 

 sector, this species is similar to betulella. Many specimens of betulae- 

 colens lack the radial sector and in most cases it is only faintly indi- 

 cated at best. These two species, therefore, are probably congeneric. 



The genus Callipterinella was based on betularius Kalt., and this 

 species proves to be very similar to betulaecolens. It is true that the 

 frontal tubercles are not prominent in this species as they are in the 

 type of Calaphis. There seems no doubt, however, that all of these 

 three species are closely related. This relation is shown in part by 

 the sexual forms. The oviparous females all possess sensoria on the 

 antennae and are very similar in other body characters. This pres- 

 ence of sensoria in the oviparous form, while not important in some 

 groups, separates quite distinctly this small group of species from those 

 of the Myzocallis type. It seems evident that the relations of betu- 

 larius are with betulaecolens and betulella. Callipterinella, therefore, 

 is also a synonym. 



Characters. — Cornicles present, distinct, truncate. Antennae of six segments, 

 armed with oval sensoria and placed on more or less distinct tubercles. Fore wings 

 with the media twice branched, the radial sector either absent or faintly indicated, 

 sometimes, however, complete; hind wings with both media and cubitus present. 

 Cauda distinctly knobbed, anal plate bilobed, body with prominent hairs. 



Forms living more or less solitary upon the foliage, sexes not markedly different from 

 the other forms; oviparous female producing several eggs and possessing sensoria upon 

 the antennae. 



Type (monotypical), Calaphis betulella Walsh. 



