288 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



windless and intermediate males are found. Sometimes in one 

 locality the males are nearly all apterous, sometimes nearly all 

 winged. 



T. coweni (Cockerell). Pemphigus coweni CockeveW. 

 Can. Ent., xxxvii, 3Q2, 1905. 



Subtribe Fullawayina. 



This subtribe is an evident specialization from the Chaitophorina 

 by the reduction and total lack of the cornicles. It bears the same 

 relation to the Chaitophorina that the Monaphidina does to the 

 Callipterina. Only one genus is represented. 



Fullawaya Essig. 



Cornicles absent; antennae of six segments, sensoria small and 

 subcircular. Cauda rounded ; fore wing with the media twice 

 branched. Hind wing with both media and cubitus present. 



Forms living commonly on the roots of plants. 

 F. saliciradicis Essig. 



Pom. Coll. Jour. Ent., 4, 737, 1912. 



The only species recorded from New England. 



Subtribe Pterocommina. 



Forms living on the bark of poplars and willows ; bodies promi- 

 nently hairy; cornicles often prominently developed but showing 

 much variety among the species ; cauda and anal plate rounded ; 

 oviparous females wingless ; males showing winged, wingless and 

 intermediate forms in the same species. 



Key to Genera. 



Cornicles cylindrical Pterocomma, p. 289 



Cornicles more or less swollen Melanoxantherium, p. 288 



Melanoxantherium Schouteden. 



Cornicles variable in size but usually more or less elongate and 

 swollen; antennae of six segments, sensoria oval or subcircular. 

 Fore wing with the media twice branched; hind wing with both 

 media and cubitus present. Cauda and anal plate rounded. 



Key to Species. 



1. Cornicles with a distal flange and not so abruptly constricted at 



their distal extremity 2 



Cornicles without a distinct flange and abruptly constricted at 

 distal extremity flocculosum 



2. Cornicles much more than twice as long as their greatest diameter ^ 3 

 Cornicles about twice as long as their greatest diameter smithiae 



3. Cornicles much longer than hind tarsi _ ^ 4 



Cornicles about equal in length to the hind tarsi medium 



4. Cornicles about twice as long as the hind tarsi 5 



