422 JOURNAL OF ECOXOMIC ENTOMOLOGY [Vol. 10 



Alate Viviparous Female: Morphological Characters: Antennae with the follow- 

 ing measurements: Segment III, 0.72 mm.; IV, 0.432 mm.; V, 0.352 mm.; VI 

 (0.144 mm. + 0.16 mm.). Segment III is armed with about 4 circular sensoria 

 considerably separated. Abdomen armed with three pairs of prominent finger-like 

 tubercles tipped with stout hairs. Cornicles rather long and narrow for the genus, 

 0.112 mm. long. Cauda quite deeply bilobed, suggesting that oi fumipenellus Fitch; 

 Cauda very distinctly knobbed. Length of forewing, 2.4 mm. ; length from vertex to 

 tip of Cauda about 1.7 mm. 



Color Characters: General color pale yellowish green; eyes, distal extremities of 

 the antennal segments, the tarsi, a spot on the proximal extremities of the tibiae 

 and a small area on each end of the tibiae brown. Otherwise uniform yellowish 

 green, the eyes of the embryos showing through the abdomen as small red spots. 



Described from alate viviparous females in balsam mounts. 



Type in U. S. National Museum. Cat. No. 20341. 



Myzocallis fumipennellus (Fitch). (1855, p. 166.) This seemingly- 

 rare species is known to the writer only from the type now in the 

 National Museum and from the type of caryoefolia^ Da\is, in the same 

 collection. The two seem to be identical. Fitch's type is not entire 

 but consists of the head and thorax with the third segment of one 

 antenna and part of the other, the wings and the legs. The abdomen 

 of course is shrunken. The parts remaining, however, are very charac- 

 teristic and leave little doubt that the species described by Dax-is is 

 the fumipennellus of Fitch. 



Wilson placed this species in the genus Callipterus as the only 

 American form. It is quite distinct, however, from the type of the 

 genus, and is no doubt a Myzocallis. So far as the writer is aware no 

 species of Callipterus occur in this country. 



The excellent description given by Davis (1910, p. 198) has placed 

 this species definitely in the hterature and it only remains to transfer 

 Fitch's name to his description. 



Myzocallis tilioe (L). Taken on Tilia, New Haven, Conn., Juty 14, 

 1909, by A. I. Bourne. Conn. No. 1-16/109. This well-known species 

 seems to occur commonly wherever its host tree is grown. The genus 

 Eucallipterus has been erected with this form as type. There is no 

 doubt that the species considered without other forms shows a con- 

 siderable difference from the type of Myzocallis. Three species 

 might be separated and included in Eucallipterus; tilioe L., hellus Walsh 

 and walshi Mon. The only real character to separate tilioe is the 

 deeply bilobed nature of the anal plate as compared with the shallow 

 bilobed anal plate of Myzocallis. Some species of Myzocallis, as 

 trifolii Mon., often have a distinctly bilobed anal plate. The cauda 

 and anal plate of bellus Walsh are very close indeed to those of tilioe 

 and there would be no difficulty in separating these two species from 

 the type of Myzocallis. Walshi Mon. is very close in general structure 

 to bellus Walsh; so close indeed, that it has by some been placed as a 



