98 PROCEEDINGS OF THE NATIONAL MUSEUM. vouxxin. 



spiracles of the tirtst ulxloiiiinal scg-ment, Avhich are situated at or 

 heyond the middle, never hefore the middle, and by the rather large 

 rhomboidal areolet of the front wings. 



The abdomen in the males terminates in two long, slender spines, a 

 character found in no other tribe. 



Only three genera are known, and all have been found in our fauna. 



TABLE OF GENERA. 



Vertex of head not narrowed, the lateral ocelli distant from the margin of the eye. 2 

 Vertex of liead narrowed, the ocelli large, the lateral close to the margin of the eye. 



Claws pectinate ( 755) Plesiophthalmus Forster. 



2. Claws pectinate; first abdominal segment 7;v7/( lateral carinpe extending backward 

 from the spiracles; transverse median nervure in hind wings broken. 



(756) Aat'qjhromina Forster. 

 Claws simple; first abdominal segment tiuthovl lateral carinje from the spiracles; 

 transverse median nervure in hind wings not broken. 



(757) Mesochorus Gravenhorst. 



Tribe IX. PORIZONINI. 



1868. Porizonoidx, Family 3, Forster, Verb. d. naturh. Ver. pr. Rheinl., XXV, 



pp. 141 and 147. 

 1894. Porizonini, Tribe III, Ashmead, Proc. Ent. Soc. Wash., Ill, p. 277. 

 1900. Porizonini, Tribe IX, Ashmead, Smith's Insects of New Jersey, p. 583. 



With this tribe begins a series of tribes easih'^ separated from those 

 previously defined by the shape of the stigma, which is largo and 

 broad, either triangular or ovate, but never narrow-lanceolate, 

 although otherwise approaching nearest to, or showing affinities with, 

 the Anoinalini and the Campoplegini. 



Dr. Forster called these tribes families and separated them upon ver}^ 

 slight characters. For example, the tribe Porizrjoiini ^aa separated 

 from the three which follow by the middle vein in the hind wings 

 being wanting or obliterated at its base or origin, while the basal 

 nervure is distinctly thickened at its apex or where it unites with the 

 costa or parastigma. 



In our fauna are several species described under the genus Cremas- 

 tus, with the above characters, and which evidently belong to Forster's 

 genus Temel'ucha, in this tribe. 



The genus Orthoj)diiia Taschenl>erg, placed by European authorities 

 in the tribe ITemitelmi, is evidently identical with Proedms Forster, 

 and is placed here on account of the position of the spiracles of the 

 first abdominal segment. 



Nineteen genera have been recognized in this tribe and are tabulated 



below: 



table of genera. 



First abdominal segment with the spiracles normal, not prominent 2 



First abdominal segment with the spiracles very prominent. . . (758) Probles Forster. 



2. Spiracles of first abdominal segment placed behind the middle, the abdominal 



segments not of an equal width throughout 3 



