46 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxih. 



the middle; while the areolet in the front wings, when present, is most 

 frequently small, triangular, ()bli([iie, or i-hom])oidal, often petiolate, 

 }>ut very rarely pentagonal. 



Five minor groups, or tril)es, have been recognized; one ))(Mngl)ased 

 upon Cresson's genus LaJxiia and its allies, and the others upon four 

 of Forster's so-called families — Aemnitoldw^ Llssonotoldw, Pliiiph>!da\ 

 and Xor'idoidcE. 



These tribes may be recognized l)v tin* us»^ of the following table: 



TABLE OF TKUiES. 



Heiul transverse, rarely subqiiadriite, and usually uarnnved or rounded off behind, 

 the temples not ))road; mandibles always fitting close to the clyptHis, not 

 forming a kind ol mouth opening. 

 Abdomen somewhat e(jmpressed toward apex, the ventral valve prominent, 

 plowshare-shaped, or sometimes very large lanceolate; if the ventral 

 valve is hidden, the hind coxa^ are abnormally long; antenufc usually 

 rather short and straight; hind legs much lengthened and usually with 

 stout femora. 



Hypopygium prominent, i)lowshare-shaped or lanceolati'; Iniid coxa' nor- 

 mal, rarely three times as long as thick Tril)e L Acienitini. 



Hypopygium not prominent, hidden; hind coxiie abnormally long, four or 



more times longer than thick Tribe IL Labenini. 



Abdomen depressed, rarely weakly compressed toward apex, the ventral valve 

 never prominent or jilowshare-shaped; antenna' longer and sometimes 

 eroded; hind coxge never abnormally lengthened. 



Al)domen smooth, unthout impressions and never strongly puncturetl, at the 

 most alutaceous or shagreened; no lateral impressed lines on segments 

 2-5 - - Tribe III. Lissonotini. 



Abdomen with more or less distinct impressions and usually also strongly 

 punctured; if smooth, alutaceous or coriaceous; always with lateral 



impressed lines on segments 2-5 Tribe IV. Pimplixi. 



Head quadrate or cubical, the temples l)road, not narrowed behind; mandibles most 

 frequently slightly projecting forward and forming, with the clypeus, a 

 a kind of mouth opening, or the clypeus is depressed. 



Tribe V. Xokidini. 



Tribe I. ACCENITINI. 



1868. Ac(cnitoid:v, Family 17, Fokster, Verb. d. iiaturh. Ver. jtr. Kheinl.,XXV, 



pp. 142 and 167. 

 1894. Acmiilhii, Tribe I, Asiimead, Troc. Ent. Soc. AVash., Ill, p. 278. 

 1900. Aca-n'itini, Tribe I, Ashmead, Smith's Insects of New Jersey, p. 571. 



This group is distinguished from all the others by the shape of the 

 abdomen, which is much elongated, compressed at apex, and furnished 

 with a large, prominent, plowshare shaped, or lanceolate, hypopygium; 

 the antenniv are rather short and straight, while the hind legs are 

 unusually long, with rather short and stout femora. 



Superficially, many of the species falling in this group, especially 

 among the males, resemble those in the tribe Memstenini^ in the 

 subfamily Cryjjtime, in colorational pattern and in having long hind 



