REVISION OF STBEPSIPTERA PIERCE. 71 



2. Family Myrmecolacid^e Pierce. 



Wings with all eight primary veins from base, the medius curved upward and branched 

 at right angles 3. Myrmecolax Westwood. 



Wings having only six primary veins, the cubitus and third anal being missing, 

 with a short detached vein just below the apex of the radius, medius short and 

 continued by a long detached vein beginning behind it and shortly before its apex. 



4. Csenocholax, new genus. 



3. Family Stylopid.e Kirby. 



Wings with eight primary veins from base, with two distal detached veins between 

 the radius and medius; antennae short and robust 5. Stylops Kirby. 



Wings with seven primary veins from base, cubitus missing, costal margin with dis- 

 tinct stigma, subcosta and radius apically united, a detached branch of radius 

 immediately posterior to that vein, a detached branch of medius between radius 

 and medius; third anal very short; antennae more attenuate. 6. Parastylops Meijere. 



Males unknown 7. Halictostylops new genus. 



4. Family HylechthridvE Pierce. 



Wings with seven primary veins from base, with two distal detached veins between 

 the radius and medius, which are basally united, and with the cubitus appearing 

 as a detached vein 8. Hylechthrus Saunders. 



5. Family Xenid^e Semenov. 



Maxillae simple, two-jointed. 



Scutellum of metathorax pedunculate anteriorly, postlumbium short and trans- 

 verse ; cedeagus inflated at basal angle Xeninse Pierce. 



Scutellum of metathorax not pedunculate anteriorly; postlumbium more than 

 half as long as wide; cedeagus not conspicuously inflated at basal angle. 



llolictoxeninx Pierce. 

 Maxillae three-jointeo, apparently. 



Scutellum of metathorax pedunculate anteriorly; postlumbium short and trans- 

 verse (if Westwood saw the mouth parts wrongly this group must become a part 

 of the Xeninae) Ilomilopinas Pierce. 



Scutellum of metathorax not pedunculate anteriorly; postlumbium more than 

 half as long as wide; cedeagus beginning as a narrow tube, then greatly inflated, 

 bent at right angles and produced as a very slender process; (in previous pub- 

 lications the writer interpreted the mouth parts incorrectly to include a third 

 pair) Cmwfordinx Pierce. 



Subfamily Xeninae Pierce. 



Wings having eight primary veins. 



Wings with two distal detached veins between the radius and medius, and one 

 detached vein between the medius and cubitus; postlumbium very short, 

 transverse and not differing in consistency from the scutellum or postscutellum. 



19. Eupathocera Pierce. 

 Wings with two distal detached veins between the radius and medius. 



Antennae foliaceous, bluntly rounded at tips of ramae (cedeagus not bounded 

 at base by two apical lobes, simple, sinuate, reflexed). 



Palpi with basal joint short, robust, second elongate, subcylindrical, de- 

 flexed ; cedeagus longitud inally ridged 13 . Pseudoxenos Saunders . 



Palpi with basal joint crassate, arcuate, second cylindrical, deflexed. 



16. Paraxenos Saunders. 



Antennae tapering to tips of ramae, short, hardly longer than head is wide, 



ramae equal, deflexed, compressed somewhat ensiform; cedeagus arising 



between two reflexed lobes, broad at base, strongly reflexed toward apex, 



apically acute 9. Xenos Rossi. 



