124 PROCEEDINGS OF THE NATIONAL MUSEUM. voi..xxin. 



Seven genera have been recognized, separable as follows: 



TAHLK OF (iENEKA. 



Mesonotum imth two distinct furrows 2 



Mesonotuni without furrows entire. 



First (liscoidal cell i)etiolate; nietanotum with a transverse apical carina. 



(955) Centiatcs Ui\Vu\ay^=Llophr(m Nees (Forster). 



2. Abdomen with only three visible dorsal segments, the others, if present, retracte<! 



and invisitjle 



Abdomen with more than three dorsal segments, usually 6 to 8 segments. 



Anal cell in front wings imili one or two transverse nervures or stumps of 



nervures between its base and apex 4 



Anal cell in front wings tvithont a trace of such nervures 3 



3. First discoidal cell sessile, the cubitus originating from the base of the para- 



stigma. 



Abdomen elongate, longer than the head and thorax united, the sides par 

 allel or nearly; first joint of flagelluni longer than the scape and pedicel 

 united, and a little longer than the second (956) Euhudizon Nees. 



Abdomen oblong-oval, not or scarcely longer than the head and thorax 

 united, the sides not parallel; first joint of the flagellum shorter than 

 the scape and pedicel united, and not longer than the second. 



(957) BracMstes Vf e»\VL?Le\. 



4. First culjital and tirst discoidal cells separated, the first abscissa of the cubitus 



never ol)literated 5 



First cubital and first discoidal cells confluent, the first abscissa of the cubitus 

 wanting or obliterated (958) Sirrlnzus Forster. 



5. First abscissa of the radius very short, shorter than the transverse median nerv- 



ure; second discoidal cell open at the lower aj)ical angle. 



(959) Leiophron Nees (Marshall) ? =Ancylus Haliday. 

 First abscissa of the radius not short, as long or longer than the transverse 

 median nervure; second discoidal cell closed. 

 First abscissa of the radius distinctly longer than the transverse median 

 nervure; first joint of the flagellum longer than the globose scape and 

 pedical united; metanotum not longer than wide; abdomen not longer 

 than the thorax, scarcely so long. 



(960) Allurus F(")rster? =Anntloce7itrus Forster? ^Liopliron Authors, (part). 

 First abscis.sa of the radius not longer than the transverse cubitus; first joint 



of the flagellum not longer than the scape and pedii*el united, usually a 

 little shorter; mesonotum longer than wide; abdomen as long as the 

 head and thorax united, or at least longer than the thorax. 



(961) BrachiHteK Wesmael =i/)Ojj/)ron Authors. (\)axX) = Otlyptus Authors, 

 (part). 



6. Anal cell usually with a slight ol)lique nervure toward the base; n:ietonotum 



with a short median carina connected with an apical transverse carina. 

 (962) CalyptuK naliday=/>r«r//(.s/«'s Wesmael (part). 



1818. Bassi, Family 11, Xees, Berl. Mag., VII, p. 243. 



1818. Sigalphi, Family 1, Nees, Berl. M:ig., VII, p. 247. 



1862. Siyalphoidu, Family 8, Fokstek, Verb. d. naturli. Ver. \w. Rheinl., XIX, pp. 



228 and 242. 

 1885. Sigalphklex Marsh.vli., Trans. Ent. Soc. I.(Mid., p. 10. 

 1887. Sigalphi7iie, Subfamily, Ckesson, Syu. Ilym. North Amcriv-a, pp. 55 and 58. 



