28 BULLETIN 826, U. S. DEPARTMENT OF AGRICULTURE. 



Genus THERIOAPHIS Walker. 

 Plate IV, K, L. 



1870. Therioaphis Walker, The Zoologist, p. 1999. 



1905. Kallistaphis Kirkaldy, Can. Ent., v. 37, p. 417. 



1906. Eucal'iptcrus Schouteden, Ann. Ent. Soc. Belg., v. 50, p. 31. l 



1915. Neocallipterus Van der Goot, Beitriige zur Kennt. der Holl. Blattlause, p. 320. 



The genus Therioaphis Walker was erected with ononidis Kalt. as 

 type 7 and ononidis has been shown by Theobald to be the common 

 "yellow clover aphis," trifolii of Monell. This species has a deeply 

 cleft anal plate quite different from that of Myzocallis. Eucallipterus 

 was erected with tiliae L. as type, a species with quite similar struc- 

 ture. Eucallipterus, therefore, will become a synonym. Betulicola 

 Kalt. has been used as type by Kirkaldy and Van der Goot. Accord- 

 ing to Das, Van der Goot considers this congeneric with trifolii. 

 Therefore Therioaphis is the name that must be used. 



Characters. — Cornicles truncate, rather constricted mesad of apex. Antennas cf sis 

 segments without prominent hairs and armed with subcircular sensoria. Fore wings 

 with media twice branched; hind wings with both media and cubitus present. Wings 

 often variously marked. Pro thorax rather elongate; cauda knobbed. Anal plate 

 deeply bifid so that two long, narrow lobes are formed. Body often with prominent 

 hairs. 



Type (monotypical), Aphis ononidis Kalt. 



Genus EUCERAPHIS Walker. 



Plato IV, Q, P. 



1S70. Euceraphis Walker, The Zoologist, p. 2101. 



1908. Callipteroides Mordwilko, Ann. Mus. Zool. l'Acad. Imp. des Sei. St. Petersbourg, v. 13, p. 377. 



1913. Callipteroides Van der Goo J , Tijd. voor. Ent., v. 56, p. 151. 



When Walker erected his genus Euceraphis with betulae L. as type 

 he had in mind evidently the same species as that described by Koch 

 under the same specific name, and thus separated species of this 

 type. Mordwilko in 1900 erected the genus Callipteroides with 

 nigritarsus Heyden as type. Specimens of this species received from 

 Mordwilko show that the species he had was the betulae of Koch or 

 at least a species veiy close to it. This would then make Callipte- 

 roides a synonym of Euceraphis. In 1913 Van der Goot used the 

 name Callipteroides with betulae Koch as type and his placing, there- 

 fore, should be under Euceraphis. 



Characters. — Cornicles present, truncate. Antenna; of six segments, long and slender, 

 armed with rather narrow sensoria usually near the base of segment III, the unguis 

 of segment VI usually not much longer than the base, sensorium at the base of unguis 

 long, oval, and fringed ; more or less distinct frontal tubercles present. Fore wings with 

 the media twice branched, hind wings with both media and cubitus present. Cauda 

 usually knobbed and rather large. Anal plate usually entire. Abdomen of the alate 

 form often with distinct wax-producing glands. Forms very large and usually solitary 

 in habit, sexes similar to the other forms; oviparous female producing several eggs. 

 Type (fixed by Walker, 1870), Aphis betulae (L.) Walker (=Callipterus betulae Koch). 



1 There is considerable evidence for keeping this genus distinct. 



