60 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESOTA—1918 
enlarged near the base. Cauda usually distinctly globate, sometimes 
straight and rounded at apex. Anal plate usually distinctly emargin- 
ated, often bifurcate. 
Biological characters. In size the Callipterina vary from rather 
large to very small. They are found feeding on the leaves of woody 
plants and trees, rarely on annuals. The group has much in com- 
mon with the Chaitophorina both in structure and habitat, but is 
sharply distinguished in that, with few exceptions, all the partheno- 
genetic generations acquire wings before reproducing. They are fur- 
ther distinguished by not forming large colonies but live scattered and 
show greater activity than usual in the family. Not a few of the 
species have the ability to leap, reminding one strongly of the Psyl- 
lidae. 
KEY TO THE TRIBES OF THE CALLIPTERINA 
1. Size large and Microsiphum-like; cornicles short, sometimes enlarged at base; 
eauda long and unusually straight with the apex rounded. 
6. Tribe CALAPHIDINI 
—Size moderately large to small; cauda glokate. . . . 2 
ie 
i) 
2. Cornicles rarely longer than broad, truncate at tip, rarely wanting; spur of 
the terminal segment usually not much longer than he basal part. sometimes 
Shorter... . 7. Tribe CALLIPTERINI 
—Cornicles longer than broad and enlarged; antennae and spur exceedingly 
Lonnie > eo), 8. Tribe DREPANOSIPHINI 
6, “ripe CALAPHIDINI 
Walsh, 1862. Proc. Entom. Soe. Vol. 1. Sub Calaphis (genus). 
The tribe is here recognized for the first time. Walsh (1862) 
first foreshadowed it by the genus Calaphis which gives the name to 
the tribe. It is a curious fact that we may recognize a race of large 
torms and one of small forms running through the subfamily 
Aphidinae. Tribes of the large race-form are some of the Ptero- 
chlorini, the Pterocommini, Calaphidini, and Macrosiphini. 
Morphological characters. Antennae usually much longer than 
the body and situated on distinct frontal tubercles; front concave as 
in Macrosiphum. Rostrum short. Cornicles short, cylindrical, and 
sometimes enlarged at base. Cauda straight with a rounded apex. 
Anal plate entire or slightly emarginated, never deeply bilobed. 
Biological characters. These large and Microsiphum-like forms 
are found on the leaves and tender twigs of alder and birch. The 
tribe has characters that ally it with the Lachnina as well as the 
Microsiphini, while its more fundamental characters place it natu- 
rally in the Callipterina. Some of the species at least are further 
characterized by wax glands on the body, legs and antennae, which 
