28 STREPSIPTERA 



ii. P. louisianac. Pierce. Louisiana, Nebraska. 



Leionotoxeiios louisiaaae, 1'ierce, Bull. U. S. Nat. Mus. no. 66, p. i38, pi, 1 1, 

 f. 4 (1909). 



12. P. ptdestridis. Pierce. Proc. U. S. Nat. Mus. Vol. 40, p. 5oo (1911). Illinois. 



i3. P. robertsoni, Pierce, ibidem, p. 5oi (191 1). Illinois. 



14. P. schaumii, Saunders, Trans. Ent. Soc. Lond. p. 44, pi. 7, f. 6-12 Corcyra. 

 (1872).- PI 5, Fig. 7. 



P. schaumii. Pierce. Hull. U. S. Nat. Mus. no. 66, p. i35, pi. 10, f. 2 (1909). 

 i5. P. tigridis, Pierce, Proc. U. S. Nat. Mus. Vol. 40, p. 5oi (191 1). Illinois. 



2. Genus MONOBIAPHILA, Pierce 



Monobiaphila. Pierce, Bull. U. S. Nat. Mus. no. 66. p. r 3g (1909). 



Characters. — Male unknown. 



Female. — Cephalothorax broader than long, constricted at base, broadest at spiracles, convex 

 from base to spiracles, slightly oblique, but very nearly straight from spiracles to base of head, at which 

 point there is a slight emargination, thence very oblique to mandibles, apex convex. Mandibles broad, 

 apically emarginate between the long curved tooth and the obtuse outer angle. 



Triungulinid. — Similar to that of Pseudoxenos. 



Type of genus. — M. bishoppi, Pierce. 



Geographical distribution of species. — Parasites of wasps of the genus Monobia. 

 1. M. bishoppi, Pierce, Bull. U. S. Nat. Mus. no. 66, pp. 139, 140; pi. 11, Texas. 

 f. 1 (1909). 



3. TRIBUS TACH YTI X E N I N I , NOV. TRIBUS 



Characters. — This tribe is like the others only established for convenience until all of the 

 genera in the Xeninse can be studied alike. It is to contain under this temporary arrangement the para- 

 sites of the Larridae. 



I. Genus TACHYTIXENOS, Pierce 



Tachytixenos. Pierce, Proc. U. S. Nat. Mus. Vol. 40, p. 5oi (1911). 



Characters. — Male. — Head transverse, broadly produced over the antenna;. Mandibles 

 curved, stout, ensiform, apically acute, maxilla; two-jointed, the first joint stout subclavate, the second 

 longer, tapering, but not acute at apex. Eyes large, many-facetted. Antenna; normally xeniform, rami 

 flattened. Prothorax transverse, slightly arched forward. Mesothorax shorter, emarginate by praescutum; 

 elytra slender, clavate. Metathoracic praescutum keystone-shape; scuti broad, angularly produced over 

 base of wings, narrowly separated by peduncle of scutellum ; scutellum reaching praescutum in a pedun- 

 culate process which widens to the main body in a sinuate curve, posterior angles laterally produced, 

 posterior edge bisinuate ; postlumbium of different consistency from other parts, with both anterior and 

 posterior edges bisinuate; postscutellum broad, strongly convex. Wing venation light. Legs moderate, 

 posterior femora inflated behind. GEdeagus with almost no curve beneath at base and with the first outer 

 bend very near base, reflexed at the apical fourth at about a right angle, apex very acute. 



