76 ENTOMOLOGICAL SOCIETY 



cialization of other functional organs, aiid with dissimilar sexes. 



(S. — Elytrophorous, winged, ephemeral, aerial. Head and 

 thoracic segments united by elastic commissures. Head trans- 

 verse, with eyes stalked and composed of regularly placed 

 separated hexagonal ommatidia. Mouth parts specialized, rudi- 

 mentary, vestigial, or lacking. Antennae sensitive, with one or 

 more joints laterally produced. Tarsi pulvilliform below ; 

 tarsal claws present only in genus Mengea. 



?. — Larviform, apodous, permanently endoparasitic, enclosed 

 by the persistent skin of the pupa. Pupa larviform, apodous. 



Reproduction prolific, ovoviviparous. Development endo- 

 parasitic and highly metamorphic. Alimentation osmotic. 

 Hosts various, hexapodal. 



TABLE OF SUPERFAMILIES — MALES. 



1. Tarsi with five joints and two tarsal claws. .. .Mengeoidea, n. superf. 

 Tarsi with less than five joints 2 



2. Tarsi four-jointed; antennae with third joint laterally produced, 



Xenoidea, n. superf. 

 Tarsi with less than four joints 3 



3. Tarsi three-jointed Halictofhagoidea, n. superf. 



Tarsi two-jointed ElenchoideAj n. superf. 



TABLE OF FAMILIES — MALES. 

 Superfamily Mengeoidea Pierce. 



Antennas seven-jointed, third and fourth joints laterally produced, 



Mengeid^, n. fam. 



Superfamily Xenoidea Pierce. 



1. Antennae seven-jointed, fourth joint short, others beyond elongate, 



Myrmecolacid.^, n. fam. 

 Antennae not seven-j ointed 2 



2. Antennae six-jointed, last three joints not much surpassing the third, 



Stylopid^ Kirby, redefined. 

 Antennae not six-jointed 3 



3. Antennae five-jointed, with fourth joint very short, and fifth elongate, 



Hylechthrid^, n. fam. 

 Antennae four-jointed, with third and fourth joints elongate, subequal, 



Xenid^ Semenov, redefined. 



Superfamily Halictofhagoidea Pierce. 



Antennas seven-jointed, having the third, fourth, fifth, and sixth joints 

 produced laterally and the seventh elongate. Halictofhagid^, n. fam. 



Antennae four-jointed, with the third and fourth joints elongate, sub- 

 equal D10XOCERID.E, n. fam. 



