160 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



Name derived from Agallia (the host genus) + fyayiuv (to eat), 

 meaning parasitic on Agallia. 



The location of the genus is uncertain although it undoubtedly 

 belongs in the Halictophagidae with the other jassid parasites. 



i. AGALLIAPHAGUS AMERICANUS Perkins (1905). 



Ilalictophagus (?) americanus Perkins, 1905. 

 Agalliaphagus americanus Pierce, 1908. 



Host. — Agallia J^-notata; Columbus, Ohio. 



This species was described b} r Perkins as follows: 



Female. — Length about \ mm. Dark brown or piceous, suboblong, the anterior 

 median area distinct in apical view, but generally hardly visible in surface view, 

 owing to its portion on the apex of the head, which is bent at an angle to the outer 

 surface, tuberculate on either side of this area; the whole disk of the head deeply 

 impressed so as to form a great cavity leading into the opening of the brood-chamber 

 (Perkins, 1905). 



28. Genus MEGALECHTHRUS Perkins (190S). 



Name derived from iiz-fdAr} (large) +ex0poc (enemy) = large parasite. 



Type of genus.- — Megaleclithrus tryoni Perkins (1905). 



The genus is parasitic on the genus Platybracliys or an allied genus. 



Male antennas 7-jointed, five being foliaceous. 



Female. — Head ovate, moderately elongate, the opening of the 

 brood-chamber near the middle or rather in front of it, the small 

 anterior median area distinct, a little produced in front, and tuber- 

 culate on either side of this area in front. This large form appears 

 to be allied to Pentoxocera and Pentacladocera, but is, as Perkins 

 thinks, distinct genetically from these, by its long, ovate form and 



great size. 



i. MEGALECHTHRUS TRYONI Perkins (1905). 



Host. — Platybracliys (?), species, Cairns; Queensland. 



Female. — Head ovate, moderately elongate, yellow or brownish 

 yellow, shining when clean, but often dull from the excrement of its 

 host, more strongly convex behind the orifice of the brood-chamber 

 than in front of it. 



Male. — Puparium brown or pitchy, unicolorous or nearly so. 

 Length about § mm. 



29. NEOCHOLAX, new genus. 



Name derived from vkog (new) + xbkat; (parasite), meaning a new 

 and interesting parasite. 



Antennas 7-jointed, the third, fourth, fifth, and sixth branched 

 beneath, the basal part of the third elongate as in Pentacladocera. 

 Mandibles short and acute. Palpi with first joint short, cylindrical, 

 one-third as long as second, obliquely truncate at apex; second joint 



