56 BULLETIN 826> U. S. DEPARTMENT OF AGRICULTURE. 



Characters. — Head with antenna! tubercles present. Vertex with a prominent rec- 

 tangular process, both the antennal tubercles and the frontal process armed with 

 knobbed spines. Antennae of six segments, the first segment lacking the process and 

 capitate hairs of Capitophorus. Cornicles rather slender and swollen near the distal 

 extremity. Cauda elongate, somewhat conical. 



Type (monotypical), Francoa elegans Del Guercio. 



Genus HYALOPTEROIDES Theobald. 

 1916. Hyalopteroides Theobald, The Entomologist, v. 49, p. 51. 



The genus Hyalopteroides was erected by Theobald for his species 

 pallida found in the nest of Lasius niger, Porlock Weir, Somerset. 

 It bears a striking resemblance to Pergandeidia but there are no 

 prominent antennal tubercles in that genus. However, there are 

 slight swellings suggestive of those figured by Theobald. The writer 

 has never seen specimens of 'pallida and therefore is unable to give a 

 personal opinion. Theobald says, "Head with marked frontal 

 tubercles." This would place the genus as not closely related and 

 pending a study of specimens it may be left thus. 



Characters. — Head with prominent antennal tubercles. Antennae of six segments 

 and armed with subcircular sensoria. Cornicles subcylindric, short, much shorter 

 than cauda. Cauda long and conical. 



Type (monotypical), Hyalopteroides pallida Theo. 



Genus ILLINOIA Wilson. 

 Plate VIII, H-J. 



1910. Illinoia Wilson, Ann. Ent. Soc. Am., v. 3, p. 318. 



1914. Metopeurum Mordwilko, Faune do la Russie, Hemiptera, , v. 1, p. 56, 67. 

 1914. Acyrthosiphon Mordwilko, Faune de la Russie, Hemiptera, v. 1, p. 55, 62. 



This genus is closely related to Macrosiphum Pass, from which it 

 may be distinguished by the nature of the cauda. 



Characters.— Head with prominent -diverging frontal tubercles. Antennae of six 

 segments armed with subcircular sensoria. Fore wings with the media twice branched, 

 hind wings with both media and cubitus present. Cornicles cylindrical, sometimes 

 slightly larger toward the middle which appearance is accentuated by a constriction 

 often present near the distal extremity. Cauda conical, not as in Macrosiphum with 

 a constriction near its base. Males usually winged, oviparous females apterous. 



Type (fixed by Wilson, 1910), Siphonophora liriodendri Mon. 



Genus MACROSIPHONIELLA Del Guercio. 

 Plate VIII, R-T. 



1911. Macrosiphoniella Del Guercio, Redia, v. 7, p. 331. 



1913. Macrosiphum Van der Goot, Tijd. voor Ent., v. 56, p. 145. 



1914. Dielcysmura Mordwilko, Faune Russ. Aphidodea, p. 56. 



The genus Macrosij>honiella was erected by Del Guercio with atrum 

 Ferr. as type. In 1913 Van der Goot used Macrosiphum of Passerini, 

 indicating millefolii Fab. as type. This species can not be made the 

 type of Macrosiphum Pass., and since it is essentially like atrum, V. 

 d. Goot's Mascrosiphum must become a sjnionym of Macrosipho- 

 niella. In 1914, Mordwilko used the generic name Dielcysmura for 

 miUefolii and figured the species. This name then proves also to be 

 a synonym. 



