28o CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



circular sensoria. Fore wing with the media twice branched, hind 

 wing with both media and cubitus present. Cauda knobbed, anal 

 plate bilobed but not deeply divided, body often with stout hairs. 



Key to Species. 



1. Dorsum of abdomen with finger-like tubercles 2 



Dorsum of abdomen without finger-like tubercles 4 



2. Unguis of segment vi of antennae about equal in length to the base 3 

 Unguis of segment vi about twice as long as base punctatellus 



3. Segment iii of antennae shorter than width of head across the eyes ; 



abdominal tubercles setose and dark brown fumipenellus 



Segment iii of antennae longer than width of head across the eyes 



ulmifolii 



4. Unguis of segment vi considerably longer than base 5 



Unguis of segment vi about equal to or less than length of base . . 



alnifoliae 



5. Wings more or less banded or mottled with dark brown 6 



Wings not so banded or mottled .coryli 



6. Cornicles and a patch around their bases black discolor 



Cornicles and a patch around their bases yellow asclepiadis 



M. alnifoliae (Fitch). Lachnus alnifoliae Fitch. 



Homop. N. Y. St. Cab., 67, 1851. 

 M. asclepiadis (Monell). Callipterus asclepiadis Monell. 



Bull. U. S. Geol. Geog. Surv. Terr., v, 29, 1879. 

 M. coryli (Goeze). Aphis coryli Goeze. 



Ent. Beitrage ii, 311, 1778. 

 M. discolor (Monell). Callipterus discolor Monell. 



Bull. U. S. Geol. Geog. Surv. Terr., v, 30, 1879. 



On white oak, New Haven, 25 July, 1912 (J. K. L.). 

 M. fumipenellus (Fitch). Aphis fumipenella Fitch. 



Nox. and Ben. Ins. N. Y., i, 166, 1855. 

 M. punctatellus (Fitch). Aphis punctatella Fitch. 



Nox. and Ben. Ins. N. Y., i, 166, 1856. 



On oak. New Haven, 25 July, 1912 (J. K. L.) ; New Haven, 27 June, 

 1913 (H. L. Trowbridge). 

 M. ulmifolii (Monell). Callipterus ulmifolii Monell. 



Bull. U. S. Geol. Geog. Surv. Terr., v, 29, 1879. 



On elm, New Haven, 13 July, 1909 (A. I. B.). 



Symydobius Mordwilko. 



Cornicles present, truncate, or with an evident neck and a broad 

 low base. Antennae of six segments armed with numerous deli- 

 cate hairs, sensoria somewhat oval or subcircular; sensorum at 

 base of unguis not long and narrow. Cauda rounded; anal plate 

 somewhat similar in shape, sometimes slightly indented. Fore 

 wing with the media twice forked ; hind wing with both media and 

 cubitus present. 



