80 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



Face much broader than high, humped; mesothoracic furrows distinct to the 

 middle of the mesonotum ( 613 ) Tapinojis Forster. 



7. Flagellar joints in female usually wider than long, rarely as long as wide; third 



abdominal segment with a transverse impression before the middle. 



(614) Atmetus Forster. 

 Flagellar joints all, or at least many, longer than wide; third abdominal seg- 

 ment aithout a transverse impression (615) OrtliocentruK Gravenhorst. 



8. Mesopleura separated from the mesopectus by an abbreviated furrow; second 



abdominal segment "(7/; distinct linmkc; stigma in male large, squarely 

 truncate at apex; sheaths of ovipositor in female broad; the abscissa of 

 the cubitus which lies between the cubital and discoidal cross veins 

 fully three-fourths the length of the first abscissa of the radius. 



(616) Plhrnosemus Forster. 

 Mesopleura not separated from the mesopectus by a furrow; second abdominal 



segment irithout Immlce; stigma in male normal; sheaths of ovipositor in 

 female narrow; the abscissa of the cubitus wliich lies between the cul)ital 

 and discoidal cross veins scarcely half the length of the first abscissa of 

 the radius. 

 Stigma narrow and long, the radius originating near its base. 



(617) Stenomacrus Forster. 

 Stigma somewhat broad, the radius originating from the middle. 



(618) Camarotops Forster. 



Tribe VII. EXOCHINI. 



1855. Tryphonides jiro^opi Holmgren, Kongl. Svensk. Vet.-Akad. Handl., I, 



p. 98; II, 1856, pp. 305-352. 

 1868. Exochoida', Family 12 Forster, Verb. d. naturh. Ver. pr. Rheinl.,XXV, 



pp. 142 and 161. 

 1894. Exochini, Tribe VI, Ashmead, Froc. Ent. Soc. Wash., Ill, p. 277. . 



1897. Exochini, Tribe Davis, Trans. Am. Ent. Soc. , XXIY, p. 206. ' 



1900. Exochini, Tribe YI, Ashmead, Smith's Insects of New Jersey, p. 379. 



The nearest iillios of this tribe are the rf /i ocentrin i und the Tyle- 

 coiiinivl; from the former it is separated by the short globose scape, 

 from the latter hy the swollen face. 



Mr. Davis ^ attempts to retain Cresson's genus Exocholdes for a 

 species to which I gave the name hchyrocneim^ Carolina. 



Mr. Cresson's genus is clearly a synonym of Alcocerus Forster, and 

 as originaUy described l\v him included only three species from Mex- 

 ico, 'wltliout an arcolet in the front wings. ExoeJioides texanv.s, with an 

 areolet, was not descrilied until long afterwards, and can not now be 

 considered the type of that genus. It was not one of the original 

 species, and is here made a t3'pe of a new genus. 



Twelve genera have been recognized, separable as follows: 9 



TABLE OP CiENERA. 



Abdomen sessile or subsessile, the spiracles of first segment placed at or before the 

 middle 4 



Abdomen petiolate; the spiracles of first segment placed at or behind the middle. 

 Posterior tibite with 2 apical spurs; cheeks wanting or very short 2 



1 Trans. Am. Ent. Soc, XXIV, p. 206. 



I 



