LACEBUGS OF THE WORLD 17 



usually carina te with carinae arranged in combinations of one (pi. 4), three 

 (pi. 5), or five (pi. 6); hind margin of pronotum little produced backward, 

 wide, slightly sinuately or obtusely angulately truncate, never triangularly 

 prolonged backward; scutellum small, either exposed or covered by hind 

 margin of pronotum; clavus large, well developed, always entirely visible 

 (pi. 2), often more or less fused with discoidal area (pi. 4); abdominal sterna 

 II and III fused, other sterna free. 



Subfamily Cantacaderinae Stal (p. 22) 

 Head either (1) very short (pi. 50), only slightly produced in front of compound 

 eyes, sharply declivent in front; antennal segment I mostly surpassing apex 

 of clypeus (pis. 9, 10), or, (2) very long (pi. 51), subporrect, much produced 

 in front of compound eyes, apex of antennal segment I and sometimes also 

 that of II not surpassing apex of clypeus (pi. 51); unarmed or armed with 

 one to five (rarely seven) tubercular or spinelike processes; bucculae either (1) 

 short, with anterior ends not extending beyond lateral sides of labium, or, 

 (2) long, with ends curved inward and almost or meeting mesad in front of 

 labium; pronotum carinate, carinae present in combinations of either one 

 (pis. 7, 14, 40) or three (pis. 9, 12); hind margin of pronotum triangularly 

 prolonged backward (pi. 10), occasionally with apex much abbreviated, 

 always completely covering scutellum and clavi of elytra in resting posture; 

 abdominal sterna II and III fused, other sterna free. 



Subfamily Tinginae Laporte (p. 42) 



The cantacaderines comprise a moderately large, sharply defined group 

 and represent the oldest of the living lacebugs. Of the 21 known genera, 

 Phatnoma is the only genus shared by the Old and New Worlds. The 

 subfamily is unknown in the Americas north of Mexico. 



Key to Tribes of Cantacaderinae 



Elytron with a narrow, uniseriate stenocostal area lying between the costal area 

 and outer margin of elytron (fig. 4; pis. 5, 6) .... Cantacaderini Stal (p. 22) 



Elytron without stenocostal area, the outer margin of costal area forming the 

 exterior boundary of elytron (fig. 5; pis. 2, 4). 



Phatnomini Drake and Davis (p. 30) 



The tingines excel by far the other subfamilies both in number of species 

 and populations, and are well represented in all continents. Almost all 

 the lacebugs that live at the expense of cultivated, decorative, and wild 

 plants of importance in human welfare belong to this subfamily. The 

 tribes may be separated thus: 



Key to Tribes of Tinginae 



1. Head very long, greatly prolonged in front of compound eyes, subporrect; apex 

 of antennal segment I (sometimes also that of II) not surpassing apex of 

 clypeus (pis. 51, 52) Ypsotingini, new tribe (p. 428) 



