FAM. MENGEID.E 9 



Characters. — Male. — Head transverse, eyes multiple-facetted, normal. Mandibles short, 

 acute: maxillae with basal joint short, palpus longer. Antennas pubescent, sensitive, seven-jointed: first 

 two joints short: third and fourth laterally flabellate; fifth, sixth and seventh cylindrical. Prothorax 

 transverse, broadest at base; mesothorax somewhat broader and longer, with a sharply outlined scutel- 

 lum: metathorax long. Elytra short. Wings having eight primary veins from base, with one distal 

 detached vein between the subcosta and radius, and with the first and second anal veins apically united. 

 Tarsi five-jointed, the last joint bearing two three-angled, straight claws. 



Female unknown. 



Type of genus. — M. tertiaria, Menge. 



Geographical distribution of species. — Hosts unknown. 



i. .1/. tertiaria, Menge. — PI. 5, Figs. I , 2. Fossil in amber, Germany. 



Triaena tertiaria, Menge, Schrift. Naturf. Ges. Danzig (2), Vol. 1, pp. 3, 4, 



ft". 1-6 (1866). 

 Mengea tertiaria, Grote, The CanaJ. Entom. Vol. 17, p. 100(1886) ; Pierce, 



Bull. U.S. Nat. Mus. no. 66, p. 84, pi. 1, f. 1 (1909) ; Hofeneder, Bericht. 



Naturw. Med. Ver. Innsbruck, Vol. 3i, pp. 33-57, ff- io-i5 (1910). 



2. Genus TRIOZOCERA, Pierce 



Trioxocera. Pierce, Bull. U. S. Nat. Mus no. 66, p. 86 (1909) (typographical error). 

 Triozocera. Pierce, Proc. U. S. Nat Mus. Vol. 40, p. 490 (191 1) (application made to International 

 Commission of Nomenclature for authority to emend). 



Characters. — Male. — Head transverse, emarginate behind; eyes multiple-facetted, the 

 partitions very pubescent. Antennae pubescent, sensitive, seven-jointed; first two joints short, cylin- 

 drical ; third and fourth laterally flabellate ; fifth, sixth and seventh cylindrical. Prothorax and mesothorax 

 transverse. Elytra clavate. Metatlroracic praescutum transverse, very little longer on median line than 

 at sides: scuti broad, but not longer than scutellum ; scutellum elongate conical, anterior]}* rounded at 

 apex ; postlumbium very short and transverse and of a slightly different consistency ; postscutellum 

 broadly rounded at apex, as long as the preceding portions of the metathorax. Wings having seven 

 primary veins from base, with one distal detached vein beyond tip of radius, one or two detached veins 

 in front of medius; third anal lacking or indicated by an infuscation. Coxa? contiguous; anterior and 

 median trochanters distant. Tarsi five-jointed, first three joints elongate, without pulvilli, the first much 

 longer than the others, fourth with pulvillus, fifth slender and delicate, bearing two long slender claws. 

 Tenth dorsal segment consisting of a very small rounded flap, bearing the anus. CEdeagus long and 

 slender, gently sinuate, acute at tip, but not abruptly angulate near tip. 



Female unknown. 



Type of genus. — T. mexicana, Pierce. 



Geographical distribution of species. — Hosts unknown. 



1. T, mexicana. Pierce, Bull. U. S. Nat. Mus. no. 66, pp. 86. 87, text fig. 3, Mexico. 



nos. 1, 2; pi. 1. ff. 2, 3,4(1909).— PI. 1, Fig. I ; PI. 4, Figs. 16, 

 3 I , 40. 



2. T. texana. Pierce, Proc. U. S. Nat. Mus. Vol. 40, p. 491 (191 1). Texas. 



